Intel® 820E Chipset

R

Table 27. Hub Interface

Checklist Items

Recommendations

Reason/Effect

 

 

 

HL[11]

No pull-up resistor is required.

Use a no-stuff or a test point to put the

 

 

ICH2 into NAND chain mode testing.

 

 

 

HL_COMP

Tie the COMP pin to a 40 , 1% or 2% (or

ZCOMP no longer supported.

 

39 , 1%) pull-up resistor (to 1.8 V), via a

 

 

10 mil wide, very short (~0.5 inch) trace.

 

 

 

 

Table 28. LAN Interface

Checklist Items

Recommendations

Reason/Effect

 

 

 

LAN_CLK

Connect to platform LAN connect device.

 

 

 

 

LAN_RXD[2:0]

Connect to LAN_RXD on platform LAN

ICH2 contains integrated 9K pull-up

 

connect device.

resistors on interface

 

 

 

LAN_TXD[2:0]

Connect to LAX_TXD on platform LAN

 

LAN_RSTSYNC

connect device.

 

 

 

 

 

 

 

LAN connect interface can be left NC if not

Input buffers are terminated internally.

 

used.

 

 

 

 

Table 29. EEPROM Interface

Checklist Items

Recommendations

Reason/Effect

 

 

 

EE_DOUT

Prototype boards should include a

Connected to EEPROM data input

 

placeholder for a pull-down resistor on this

signal. (Input from EEPROM perspective

 

signal line, but should not populate the

and output from ICH2 perspective.)

 

resistor. Connect to EE_DIN of EEPROM

 

 

or CNR connector.

 

 

 

 

EE_DIN

No extra circuitry is required. Connect to

ICH2 contains integrated pull-up resistor

 

EE_DOUT of EEPROM or CNR connector.

for this signal.

 

 

Connected to EEPROM data output

 

 

signal. (Output from EEPROM

 

 

perspective and input from ICH2

 

 

perspective.)

 

 

 

Table 30. FWH Flash BIOS Interface

Checklist Items

Recommendations

Reason/Effect

 

 

 

FWH[3:0]

No extra pull-ups required. Connect

ICH2 Integrates 24 kresistors on

LAD[3:0]

straight to FWH Flash BIOS.

these signal lines.

 

 

LDRQ[1:0]

 

 

 

 

 

126

Design Guide

Page 126
Image 126
Intel 820E manual Hub Interface, LAN Interface, Eeprom Interface, FWH Flash Bios Interface