Specifications

Intel
®
810E2 Chipset Platform
R
Design Guide
165
Checklist
Items
Recommendations Comments
23
LAN_CLK
Connect to LAN_CLK on Platform LAN Connect Device.
24
LAN_RXD[2:0]
Connect to LAN_RXD on Platform LAN Connect Device. ICH2
contains integrated 9 k
Ω pull-up resistors on interface.
25
LAN_TXD[2:0]
LAN_RSTSYNC
Connect to LAN_TXD on Platform LAN Connect Device.
NOTES:
1. LAN connect interface can be left NC if not used. Input buffers internally terminated.
2. In the event of EMI problems during emissions testing (FCC Classifications) you may need to place a
decoupling capacitor (~470 pF) on each of the 4 LED pins. Reduces emissions attributed to LAN subsystem.
7.2.4. EEPROM Interface
Checklist
Items
Recommendations
EE_DOUT Prototype Boards should include a placeholder for a pull-down resistor on this signal line, but
do not populate the resistor. Connect to EE_DIN of EEPROM or CNR Connector.
Connected to EEPROM data input signal (input from EEPROM perspective and output from
ICH2 perspective).
EE_DIN No extra circuitry required. Connect to EE_DOUT of EEPROM or CNR Connector. ICH2
contains an integrated pull-up resistor for this signal.
Connected to EEPROM data output signal (output from EEPROM perspective and input from
ICH2 perspective).
7.2.5. FWH/LPC Interface
Checklist
Items
Recommendations
FWH[3:0]/
LAD[3:0]
LDRQ[1:0]
No extra pull-ups required. ICH2 Integrates 24 kΩ pull-up resistors on these signal lines.
7.2.6. Interrupt Interface
Checklist
Items
Recommendations
PIRQ[D:A]# These signals require a pull-up resistor. The recommendation is a 2.7 kΩ pull-up resistor to
VCC5 or 8.2 k
Ω to VCC3.3.
In Non-APIC Mode the PIRQx# signals can be routed to interrupts 3, 4, 5, 6, 7, 9, 10, 11, 12,
14 or 15 as described in the Interrupt Steering section. Each PIRQx# line has a separate
Route Control Register.
In APIC mode, these signals are connected to the internal I/O APIC in the following fashion:
PIRQ[A]# is connected to IRQ16, PIRQ[B]# to IRQ17, PIRQ[C]# to IRQ18, and PIRQ[D]# to
IRQ19. This frees the ISA interrupts.