User's Manual
Table Of Contents
- General Description
- Features
- System Applications
- Block Diagram
- Pin Assignments
- Pin Descriptions
- CPU Access to Endpoint Data
- USB Request
- Get Descriptor-Device
- Get Descriptor-Device Qualifier (High Speed)
- Get Descriptor-Configuration
- Get Descriptor-String Index 0
- Get Descriptor-String Index 1
- Get Descriptor-String Index 2
- Get Descriptor-String Index 3
- Get Descriptor-String Index 4
- Get Descriptor-String Index 5
- Get Descriptor-Other Speed Configuration
- Set Address
- Set Interface 0
- Set Feature Device
- Clear Feature Device
- Set Config 0
- Set Config 1
- EEPROM (93C46 or 93C56) Contents
- USB Packet Buffering
- Functional Description
- Application Diagram
- Electrical Characteristics
- Mechanical Dimensions
- Ordering Information
RTL8187L
Datasheet
Wireless LAN Network Interface Controller 17 Track ID JATR-1076-21 Rev. 1.2
9. EEPROM (93C46 or 93C56) Contents
The RTL8187L supports the attachment of an external EEPROM. The 93C46 is a 1Kbit EEPROM (the
93C56 is a 2Kbit EEPROM). The EEPROM interface provides the ability for the RTL8187L to read from,
and write data to, an external serial EEPROM device. If the EEPROM is not present, the RTL8187L
initialization uses default values for the Operational Registers. Software can read and write to the
EEPROM using “bit-bang” accesses via the 9346CR Register.
Although it is actually addressed by words, its contents are listed below by bytes for convenience. After the
initial power on or auto-load command in the 9346CR, the RTL8187L performs a series of EEPROM read
operations from the 93C46 (93C56).
Note: It is suggested to obtain Realtek approval before changing the default settings of the EEPROM.
Table 24. EEPROM (93C46 or 93C56) Contents
Bytes Contents Description
00h 87h
01h 81h
These 2 bytes contain the ID code word for the RTL8187L. The RTL8187L will load
the contents of the EEPROM into the corresponding location if the ID word (8187h) is
correct.
02h-03h VID USB Vendor ID.
04h-05h DID USB Device ID.
06h ChannelPlan Channel Plan: Map of channels to be scanned.
07h EnergyDetThr Energy detection threshold.
08h RFParm RF specific parameter.
09h-0Ah Version The version of EEPROM content.
0Bh Options function Bit0: Timeout function.
0: Disable RTL8187L’s USB timeout mechanism.
1: Enable RTL8187L’s USB timeout mechanism.
Bit1: USB remote wake up function.
0: There is no remote wake up feature for the RTL8187L.
1: There is a remote wake up feature for the RTL8187L.
Bit2:
0: The RTL8187L’s remote wake-up is based on the WLAN’s wake-up signal
1: The RTL8187L’s remote wake-up is push-button based.
Bit3: USB Status stage.
1: Bypass the check setup interrupt procedure of 8051 when host sends set_address
command.
Bit4: SelfloopbackISR function.
1: The UTM self loopback will be initialized by internal 8051.
Bit7:
1: The power control signal to AFE will be auto controlled by suspendm.
0Ch RFChipID RF Chip ID.
The identifier of the RF chip.