Instruction Manual

Chapter 3 Hardware
ETX-PVR Reference Manual 23
X1 PCI Bus Interface (J1)
The J1, 100-pin standard connector is used for the PCI bus, USB ports, and HD Audio interface connections.
This section briefly describes each of these features.
Table 3-4 provides the complete pin outs for the J1 (X1) connector.
PCI Bus
The CPU integrates a PCI arbiter that supports up to four external PCI masters.
• Interface carries all of the appropriate PCI signals
• Bus operates at clock speeds up to 33 MHz
• PCI 2.3 Compliant, 32-bit +3.3V PCI interface with +5V tolerant inputs
Universal Serial Bus (USB)
The ETX-PVR module supports up to four USB ports on the baseboard, and the supported features are listed
below.
• USB v2.0 and backwards compatible to Universal UHCI v1.1
• Two root USB hubs and four USB ports
• Supports USB boot of floppy disk drives, hard disk drives, CD-ROMs, or other USB boot devices
• Integrated physical layer transceivers
• Over-current detection status on USB ports 1 and 2
Serial Interrupt Request
This SERIRQ signal is connected to the serial request input on the I/O Hub (ICH8-M) for the alternative
ISA/PCI interrupts. The ETX-PVR SERIRQ pin (pin 21) must be connected to the baseboard to use the ISA
bus on the baseboard.
0A79h ISA PnP Ports
0B00-0B7F SIO Runtime Registers
0CF8-0CFF PCI bus Configuration Address and Data
NOTE 0A79h is the ISA PnP port used by the BIOS and an OS that supports this feature to
recognize ISA PnP (Plug and Play) cards.
The Intel I/O hub ICH-8 (ICH-6 or later) does not support ISA DMA.
NOTE The Intel ICH8 I/O Hub does not support ISA DMA.
Table 3-3. I/O Address Map (Continued)