Front Panel I/O Connectivity Design Guide

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February 2005

Version 1.3

Order Number A29286-005

Front Panel I/O Connectivity

Design Guide

Summary of content (72 pages)

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Front Panel I/O Connectivity Design Guide February 2005 Version 1.
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Revision History Revision Revision History Date 1.3 Updated: February 2005 • Lead free part numbers where available • 1394B header mechanical information and pin out assignment • Front Panel 1394b header definition. • Color coding 1394A vs. 1394B headers. • 1394 cable spec for inclusion in 1394 documentation • Warning regarding need to change the configuration of a 1394B port when a 1394A dongle is plugged in.
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IMPORTANT INFORMATION AND DISCLAIMERS INTEL CORPORATION (AND ANY CONTRIBUTOR) IS PROVIDING THIS INFORMATION AS A CONVENIENCE AND ACCORDINGLY MAKES NO WARRANTIES WITH REGARD TO THIS DOCUMENT OR PRODUCTS MADE IN CONFORMANCE WITH THIS DOCUMENT. THIS DOCUMENT IS PROVIDED "AS IS" AND INTEL DISCLAIMS ALL EXPRESS AND IMPLIED WARRANTIES, INCLUDING THE WARRANTY OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE.
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Preface This guide describes connection and mechanical recommendations for all main boards having internal connectors requiring external connection. Recommendations include (among others): front panel I/O header pin-out definition, chassis I/O aperture size, I/O interface board dimensions and motherboard to front panel board I/O cable shielding and size. Front panel I/O legacy connectors, internal legacy and legacy-free connectors are also addressed.
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Front Panel I/O Connectivity Design Guide Typographical Conventions This section contains information about the conventions used in this guide. Not all of these symbols and abbreviations appear in all guides of this type. Notes, Cautions, and Warnings NOTE Notes call attention to important information. CAUTION Cautions are included to help you avoid damaging hardware or losing data. WARNING Warnings indicate conditions, which if not observed, can cause personal injury.
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Contents 1 Supporting Documentation 1.1 1.2 1.3 Online Support ............................................................................................................. 11 Design Specifications................................................................................................... 12 Recommended Roles of Suppliers............................................................................... 14 1.3.1 Chassis Supplier............................................................................
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Front Panel I/O Connectivity Design Guide 4 Cabling Design Guidelines 4.1 4.2 4.3 4.4 4.5 Introduction .................................................................................................................. 35 Switch/LED Cable ........................................................................................................ 35 Front Panel Audio Cable .............................................................................................. 36 4.3.1 Introduction......................
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Figures 1. Front Panel Switch/LED and IR Headers (Top View) ............................................................ 17 2. AC’97 Front Panel Dongle Schematic ................................................................................... 20 3. Front Panel Audio Header (Top View) ................................................................................... 21 ® 4. Intel HD Audio - Analog Front Panel Header........................................................................ 23 ® 5.
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Front Panel I/O Connectivity Design Guide Tables 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. x Specifications and Design Guidelines ................................................................................. 12 States for a Single-Color Power LED .................................................................................. 16 States for a Dual-Color Power LED .........................................................................
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1 Supporting Documentation What This Chapter Contains 1.1 1.2 1.3 Online Support ............................................................................................................. 11 Design Specifications................................................................................................... 12 Recommended Roles of Suppliers............................................................................... 14 1.
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Front Panel I/O Connectivity Design Guide 1.2 Design Specifications Table 1 lists the specifications applicable to the signals present on the front panel connectors. Table 1. Specifications and Design Guidelines Reference Name Specification Title Version, Revision Date, and Ownership The information is available from… AC ‘97 Audio Codec ‘97 Version 2.3, April, 2002 Intel Corporation. http://developer.intel.com/ial/ scalableplatforms/audio/ index.
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Table 1. Specifications and Design Guidelines (continued) Reference Name Specification Title Version, Revision Date, and Ownership The information is available from… UHCI Universal Host Controller Interface Design Guide Version 1.1, March 1996, Intel Corporation. http://developer.intel.com/ design/USB/UHCI11D.htm USB Universal Serial Bus Specification Version 1.1, September 23, 1998, Compaq Computer Corporation, Intel Corporation, Microsoft Corporation, and NEC.
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Front Panel I/O Connectivity Design Guide 1.3 Recommended Roles of Suppliers 1.3.1 Chassis Supplier The chassis supplier should provide the front panel I/O board support structure and attachment screws. Screws may not be necessary if a support structure implementing an I/O board with the “snap-in” feature is used. A filler panel (or panels) to close-up the opening in the chassis and bezel should also be provided in the event that the front panel I/O board feature is not used by a particular customer. 1.
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2 Front Panel Legacy I/O What This Chapter Contains 2.1 2.2 2.3 Introduction .................................................................................................................. 15 Switch/LED and IR Connectors.................................................................................... 15 Front Panel Audio ........................................................................................................ 19 2.
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Front Panel I/O Connectivity Design Guide 2.2.2 2.2.2.1 Switch/LED Connector Features Hard Drive Activity LED Connecting pins 1 and 3 to a front panel mounted LED provides visual indication that data is being read from or written to the hard drive. For the LED to function properly, an IDE drive should be connected to the onboard IDE interface. The LED will also show activity for devices connected to the SCSI (hard drive activity LED) connector. 2.2.2.
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Front Panel Legacy I/O 2.2.3 2.2.3.1 IR Connector Features Infrared Port Serial Port B can be configured to support an IrDA module connected to pins 1, 2, 3, 5, and 6 of the 2x3-pin header connector. 2.2.
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Front Panel I/O Connectivity Design Guide 2.2.5 Pin Assignments The following two tables list the pins for the IR and Switch/LED headers. To support a legacy 2x8-pin connector to connect to both headers, see Note 3 following Table 5. Table 4. IR Front Panel Electrical Connection Pin Signal Description Pin Signal Description 1 IRRX2 IrDA serial input 2 GND Ground 3 GND Ground 4 (No pin) Key 5 IRTX2 IrDA serial output 6 +5 V IR power Table 5.
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Front Panel Legacy I/O 2.3 Front Panel Audio 2.3.1 Usage Model The design options described below support standard front panel microphone and headphone usage (for Standard AC’97 implementation) and also support new dynamic front panel jack detection and ® re-tasking usage models (for Intel High Definition Audio). 2.3.2 Features The front panel audio connector is designed to support stereo audio output (headphone or amplified ® ® speakers) and a microphone input.
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Front Panel I/O Connectivity Design Guide plugged into the front panel jack, these return signals which feed that back panel jack are disconnected, thus muting the back panel output. Note that the motherboard should not leave the back panel signal floating when front panel devices are connected. Permitting the back panel signals to float could result in excessive noise at the back panel jack when the front panel jack is in use.
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Front Panel Legacy I/O 2.3.4.2 AC’97 Audio Header Design 9 1 10 2 OM10452 Figure 3. Front Panel Audio Header (Top View) Manufacturer's Part Number: Wieson Electronic 2100C888-042 (or equivalent) 2.3.4.3 AC’97 Header Pin Assignments Table 6.
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Front Panel I/O Connectivity Design Guide NOTE Motherboards that have the foot print for a front panel header, but depopulate the front panel audio header must have 0 ohm resistors as options to connect the FP_OUT and FP_RETURN signals. These resistors must be installed when the header is depopulated to insure audio is routed to the back panel. 2.3.
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Front Panel Legacy I/O PORT1 L 1 2 GND PORT1 R 3 4 PRESENCE# PORT2 R 5 6 SENSE1_RETURN 10 SENSE2_RETURN SENSE_SEND PORT2 L 7 9 2X5 Stake Pin Header (100mil Pitch) Figure 4. Intel® HD Audio - Analog Front Panel Header Manufacturer's Part Number: Wieson* Electronic 2100C888-042 (or equivalent) 2.3.5.1 Intel® HD Audio CODEC Connections ® In general, the CODEC ports selected for front panel use are connected to the Intel HD Audio header via series coupling capacitors C1 through C4.
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Front Panel I/O Connectivity Design Guide Rbias C1 Rbias PORT1 L 1 2 GND DVDD VREF1_L VREF1_R JACK1 L 10kΩ C2 JACK1 R HD CODEC PORT1 R 3 4 PORT2 R 5 6 C3 JACK2 R VREF2_L SENSE To System GPI SENSE1_RETURN Rjd_port1** JACK2 L VREF2_R PRESENCE# SENSE_SEND 7 Jack Detection Network C4 PORT2 L 9 10 SENSE2_RETURN Rjd_port2** Rbias Rbias Jack Detection Resistors ** Values for jack detectiond resistors Rjd_port1 and Rjd_port2 should be chosen based on the which CODEC ports are co
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Front Panel Legacy I/O associated signal pins, connected directly to their respective pins on the dongle stake pin header. The SENSE_SEND signal is split and routed through the PORT1 and PORT2 isolated switches. The other contact of each isolated switch, are routed to their respective sense return signals, SENSE1_RETURN and SENSE2_RETURN.
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3 Front Panel High Speed Serial Bus What This Chapter Contains 3.1 3.2 3.3 Introduction .................................................................................................................. 27 USB Connectors .......................................................................................................... 27 IEEE-1394 Connector .................................................................................................. 31 3.
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Front Panel I/O Connectivity Design Guide 3.2.3 Dual Port USB Header The Dual Port USB Header consists of a keyed shrouded (Black in color) 2x10 stake pin header (100-mil pitch) with key locations on pins 9 and 10. 7 5 3 1 8 6 4 2 Figure 7. Dual Port USB Header (Top View) Manufacturer's Part Number: Wieson Electronic 2120C888-048G (or equivalent) (lead-free) 3.2.4 Dual Port USB Header Pin Assignments USB ports may be assigned as needed. Table 8.
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Front Panel High Speed I/O Bus Figure 8. Front Panel Single Port USB Header (Top View) Manufacturer's Part Number: Foxconn HF11050-UD5 (or equivalent) (leaded) 3.2.6 Single Port USB Header Pin Assignments Table 9.
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Front Panel I/O Connectivity Design Guide • Provides protection to the motherboard in the case where the front panel cable is cut or damaged during assembly or manufacturing resulting in a short between the USBPWR and ground. NOTE Ensure that fuse elements are not present on both the motherboard and the cabled solution. Having fuse elements in both locations results in a voltage drop at the USB connector, which may make the USB 2.0 solution non-compliant. 3.2.8.
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Front Panel High Speed I/O Bus 3.3 IEEE-1394 Connector 3.3.1 Usage Model IEEE-1394 connectivity allows for data transfer between the PC and consumer electronic devices such as digital cameras and camcorders. 3.3.2 Features This chapter summarizes the design recommendations for hardware using the IEEE 1394 standards.
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Front Panel I/O Connectivity Design Guide 3.3.3 1394 Header Design The 1394 header consists of a keyed shrouded (blue for 1394A, red for 1394B) 2x10 stake pin header (100-mil pitch) with key locations on pin 9. Note that pin 1 location relative to shroud key is opposite that of the USB header shown in Figure 7 and is intended to prevent 1394 cables from attaching to USB headers and visa versa. Figure 9.
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Front Panel High Speed I/O Bus CAUTION Since the 1394 front panel headers are keyed the same, care should be taken to ensure a valid configuration. Table 12 shows the results of different configurations. Table 12. Header Port to Cable I/O Board Configuration Chart 1394 Front Panel Header Port Configuration 1394 Front Panel Cable I/O Board Configuration Result 1394A 1394A Valid Configuration 1394B 1394B Valid Configuration 1394A 1394B INVALID CONFIGURATION.
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4 Cabling Design Guidelines What This Chapter Contains 4.1 4.2 4.3 4.4 Introduction .................................................................................................................. 35 Switch/LED Cable ........................................................................................................ 35 Front Panel Audio Cable .............................................................................................. 36 USB Cabling (Motherboard to I/O Interface Board) .............
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Front Panel I/O Connectivity Design Guide 4.3 Front Panel Audio Cable 4.3.1 Introduction This section details the design of an audio cable to be used in conjunction with the front panel I/O board. The shielding in this cable is important to reduce cross talk, signal degradation, and coupling of electromagnetic interference. The shielding is particularly important for the microphone circuit since it is a low-level signal and is very sensitive to noise.
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Cabling Design Guidelines Twisted Signaling Pair D: Cover Jacket Twisted Signaling Pair B: Twisted Signaling Pair A: Shield: > 65% Interwoven Tinned Copper Braid Inner Shield: Aluminum Metalized Polyester All Shields Tied Together Twisted Signaling Pair C: Figure 12. Front Panel Audio Cable Cross-Section P1 P2 AWG 26 1 1 A 26 3 3 2 2 26 4 4 B 26 7 7 2 2 26 5 6 5 C 26 6 2 2 26 9 9 D 26 10 10 2 2 2 2 8 KEY KEY 8 Figure 13. Audio Cable Wiring Diagram Table 13.
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Front Panel I/O Connectivity Design Guide Table 14. Audio Cable Construction Recommendations Part Qty Manufacturer/Part Number Note Material Description Note 2X5 Header 2 FCI*/ 65043-032 Header Key 2 N/A Key Heat-Shrink Tubing As req. N/A UL Heat-shrink Tube 26 AWG As req. N/A UL Certified Conductor Wire 1 N/A Manufacturer’s name and P/N (4 twisted pair shielded wire) Part Label Note: Or equivalent. Table 15.
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Cabling Design Guidelines 4.4 USB Cabling (Motherboard to I/O Interface Board) 4.4.1 Introduction This chapter provides some details of the design for a front panel USB 1.1 and 2.0 interface cable to be used in conjunction with the front panel I/O interface board and main board. The interface cable must be shielded as specified in Figure 14, for two reasons: • • To ensure the cable data lines meet the required differential characteristic impedance as given in the most recent USB specification.
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Front Panel I/O Connectivity Design Guide P1 3 5 USB_FP_P0- 28 USB_FP_P0+ P2 Twisted Pair 3 A 7 28 USB_FP_P1- 28 USB_FP_P1+ 7 20 20 VREG_FP_USBPWR0 7 KEY 2 KEY Unused 9 GROUND (Shield) 8 10 Unused N/A 7 6 1 GROUND 7 10 5 4 B 7 1 8 Signal 28 7 4 6 AWG 2 7 KEY KEY 9 Figure 15. Dual Port USB Cable Wiring Diagram Cable 9 10 1 2 10 2 9 1 Key for Shroud KEY Figure 16. Dual USB Cable Diagram NOTE Shrouded stake pin headers are highly recommended.
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Cabling Design Guidelines Table 17. Dual Port USB Cable Material List Part Qty Manufacturer / Part Number Note 2X5 Header 2 FCI/65043-032 Crimp to wire receptacle min latch housing Key 2 N/A Key (pins 9 and 10) Heat-Shrink Tubing As req. N/A UL Heat-shrink Tube Shield cable consisting of: 2 28 AWG twisted pairs, 2 20 AWG discrete wires As req. N/A UL Certified Conductor Wire Part Label 1 N/A Manufacturer's name and P/N Material Description Note Note: Or equivalent.
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Front Panel I/O Connectivity Design Guide Cable 1 5 5 1 KEY Figure 19. Dual USB Cable Diagram NOTE Shrouded stake pin headers are recommended. An un-shrouded header is shown in Figure 19 to clearly illustrate the pin configuration of the header. Cable connectors P1 should mate to header numbered as shown in Table 18 and Table 19. Table 18.
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Cabling Design Guidelines NOTE Computer systems that have an unshielded cable attached to a USB port may not meet FCC Class B requirements, even if no device or a low-speed USB device is attached to the cable. Use shielded cable that meets the requirements for full-speed devices. Table 20.
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Front Panel I/O Connectivity Design Guide connectors) and construction should enable the system to meet the performance requirements of the most current IEEE 1394 Specification and applicable safety and regulatory requirements. Table 24 shows some current recommendations regarding cable parts and materials. The cable length (in combination with the trace lengths on the main board and front panel I/O interface board) must be such that it will satisfy the signal quality requirements (propagation delay, etc.
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Cabling Design Guidelines Cable Key for Shroud 9 1 10 2 9 10 2 1 KEY Figure 22. IEEE 1394A/B Cable Diagram NOTE Shrouded stake pin headers are highly recommended. An un-shrouded header is shown in Figure 22 to clearly illustrate the pin configuration of the header. Cable connectors P1 should mate to header numbered as shown in Table 21 and Table 22. Table 21.
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Front Panel I/O Connectivity Design Guide Table 22. IEEE 1394B Cable and Connector Pin Assignments Signal AWG Pairing PIN P1 / P2 TPA+ 28 A 1 /1 TPA- 28 A 2 /2 TPA_REF SHIELD 3 /3 TPB_REF SHIELD 4/4 TPB+ 28 B 5/5 TPB- 28 B 6 /6 +12V(Fused) 20 +12V(Fused) 20 8 /8 KEY N/A 9/9 GND 20 10/10 GND SHIELD 10/10 7 /7 CAUTION Since the 1394 front panel headers are keyed the same, care should be taken to ensure a valid configuration.
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Cabling Design Guidelines Table 24. IEEE 1394A/B Material List Part Qty Vendor/Part Number Note Material Description* 2X5 Header 2 FCI/65043-032 Crimp to wire receptacle min latch housing Contacts 18 N/A Contacts for 2x5 Header Key 2 N/A Key Heat Shrink As req. N/A UL Heat Shrink Tube Cable As req.
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5 Interface Board Design Guidelines What This Chapter Contains 5.1 5.2 Introduction .................................................................................................................. 49 Front Panel I/O Interface Board Dimensions ............................................................... 51 5.1 Introduction The following chapter defines the mechanical recommendations of a front-panel interface board.
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Front Panel I/O Connectivity Design Guide Figure 24 shows the front panel I/O board interface recommendations. The face of the front panel I/O board edge should be placed 0.053 +/- 0.010 inch (1.35 +/- 0.25 mm) from the inside of the chassis front panel I/O shield and/or chassis housing. The connectors shown here are only examples. It is the front panel I/O board designer’s responsibility to properly place the connector to meet front panel I/O aperture and interface recommendations.
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Interface Board Design Guidelines 5.2 Front Panel I/O Interface Board Dimensions The front panel I/O interface board guideline defines an I/O aperture opening area that is 3.875 +/- 0.008 inch (98.43 +/- 0.20 mm) wide by 1.000 +/- 0.008 inch (25.40 +/- 0.20 mm) tall. This area allows the use of stacked connectors on the board to maximize the amount of available I/O space.
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Front Panel I/O Connectivity Design Guide Figure 25. Front Panel I/O Board Dimensions (Top and Front Views) Figure 26.
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6 Chassis and I/O Shield Guidelines What This Chapter Contains 6.1 6.2 6.3 Introduction .................................................................................................................. 53 Front Panel I/O Board Placement ................................................................................ 53 Front Panel I/O Reference Designs ............................................................................. 56 6.
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Front Panel I/O Connectivity Design Guide It is strongly recommended for the best EMI attenuation performance, paint should not be applied within the 0.1 inches (2.54 mm) minimum keepout zone on the inside and outside surfaces of the chassis front panel (Figure 27). Paint can prevent proper grounding of the I/O shield to the front chassis panel. The following list shows some front panel I/O board highlights: • Cutout size = 3.875 +/- 0.008 inches (98.43 +/- 0.20 mm) wide by 1.00 +/- 0.008 inches (25.
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Chassis and I/O Shield Guidelines Figure 27. Front Panel I/O Aperture and Interface Board Placement Recommendations Figure 28.
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Front Panel I/O Connectivity Design Guide 6.3 Front Panel I/O Reference Designs Figure 29 through Figure 34 show several front panel I/O reference designs and implementations. Additional connectors could be added if desired. These reference designs are only examples. The front panel I/O interface board guide allows flexibility in the layout of the front panel I/O connectors within the connector zone. 6.3.1 I/O Shield Reference Design Figure 29 shows an example of a standard front panel I/O shield.
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Chassis and I/O Shield Guidelines Figure 30 shows an example of a standard I/O shield reference design. It is provided here as only a reference for key features that may be used to design and secure front panel I/O shields into a standard front panel I/O aperture opening. See Figure 23 and Figure 24 for recommended dimensions of the front panel aperture and interface board placement. Figure 30.
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Front Panel I/O Connectivity Design Guide 6.3.2 Housing Reference Design Figure 31 shows an example of a chassis-dependant housing, featuring a standard front panel I/O aperture opening. The housing would support any board, shield, and specific label combination. Figure 31.
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Chassis and I/O Shield Guidelines 6.3.3 Housing and Shield Assembly Reference Design Figure 32 shows an example of a chassis-dependant housing assembly with standard front panel I/O board and shield. The label is not shown in this example. Figure 32.
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Front Panel I/O Connectivity Design Guide 6.3.4 Supporting Structure Reference Design Figure 33 shows an example of a chassis-dependant support structure, which should be used in conjunction with a standard front panel I/O shield. Figure 33.
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Chassis and I/O Shield Guidelines 6.3.5 Supporting Structure and Shield Reference Design Figure 34 shows an example of a chassis-dependant support structure and a standard front panel I/O shield assembled into a chassis front panel. This chassis front panel features a standard front panel I/O aperture opening. The support structure would support any front panel I/O interface board, shield, and specific label combination. Figure 34.
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7 Internal Legacy Connectors (Reference) What This Chapter Contains 7.1 7.2 7.3 7.1 Introduction .................................................................................................................. 63 Serial-WHQL Debug Connector................................................................................... 63 Parallel Port Connectors ..............................................................................................
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Front Panel I/O Connectivity Design Guide 7.2.2 Pin Assignments Table 25. Serial-WHQL Debug Connector Pin Signal Name 1 DCD (Data Carrier Detect) 2 DSR (Data Set Ready) 3 SIN # (Serial Data In) 4 RTS (Request to Send) 5 SOUT # (Serial Data Out) 6 CTS (Clear to Send) 7 DTR (Data Terminal Ready) 8 RI (Ring Indicator) 9 Ground 7.
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Internal Legacy Connectors (Reference) 7.3.1.2 Pin Assignments Table 26.
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Front Panel I/O Connectivity Design Guide 7.3.2 7.3.2.1 Stake-Pin Connector Pin Assignments Table 27.
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8 Internal Legacy-Free Connectors (Reference) What This Chapter Contains 8.1 8.2 Introduction .................................................................................................................. 67 LPC (Low Pin Count) Debug Connector ...................................................................... 67 8.1 Introduction This chapter contains feature descriptions of the signals assigned to the internal connectors found on legacy-free and legacy-reduced PC’s.
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Front Panel I/O Connectivity Design Guide 8.2.2 Features The following criteria were used to design the LPC debug module of which the LPC debug connector (described here) is a part.
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Internal Legacy-Free Connectors (Reference) connector supports the signals needed to have full 8042 controller support: RC#, A20GATE, and SERIRQ. NOTE Legacy operation should only be enabled for operation with a legacy operating system. This means a BIOS setup option needs to be supported which turns legacy mode on and off. In legacy operation mode, a PS/2* Keyboard and mouse would need to be attached to the debug module since a legacy-free BIOS is not required to provide USB legacy keyboard emulation.
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Front Panel I/O Connectivity Design Guide Figure 38. LPC Debug Connector Dimensions The LPC debug connector’s hole pattern is shown in Figure 39. Figure 39. LPC Debug Connector Hole Layout A physical keep-out around the LPC debug connector should be observed. The keep-out zone is 0.160 inches from the end of the connector hole pattern and 0.080 inches from the side of the connector, measured from the center of any pin.
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Internal Legacy-Free Connectors (Reference) 0.160 0.080 0.080 0.160 Figure 40. LPC Debug Connector Keep-Out Zone 8.2.4 Pin Assignments The LPC debug connector’s numbering scheme is specified in Figure 41. Debug (Only) Debug with Legacy Extension 1 2 1 2 3 4 3 4 5 6 5 6 7 8 7 8 9 10 12 9 10 11 12 13 14 13 14 15 16 15 16 17 18 19 20 11 Top View: Mating View of Connector Figure 41.
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Front Panel I/O Connectivity Design Guide 8.2.5 LPC Debug Connector Pin Assignments The pin assignments for the LPC debug connector, and LPC debug connector with legacy extension are shown in Table 29. Table 29.