Intel Xeon Processor and Intel E7500/E7501Chipset Compatible Platform Design Guide

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Schematic Checklist

234 Intel

Xeon™ Processor and Intel

E7500/E7501 Chipset Compatible Platform Design Guide

Host Side / Device

Side Cable

Detection

• Connect IDE pin PDIAG#/CBLID# to an

ICH3-S GPI pin. Connect a 10 k

Ω resistor to

ground on the signal line.

• The 10 k

Ω resistor to ground

prevents GPI from floating if no

devices are present on either

IDE interface. Allows use of

3.3 V and 5 V tolerant GPIOs.

• Refer to Section 9.1.2.1.

Interrupt Interface

APICCLK • Pull-down directly to ground.

APICD[1:0] • 10 k

Ω ± 5% pull-down to ground.

PIRQ[D:A]# • These signals require a pull-up resistor.

•2.7 k

Ω ± 5% pull-up to 5 V or an 8.2 kΩ±

pull-up to 3.3 V.

• Each PIRQx# line has a

separate Route Control

signals are connected to the

internal I/O APIC in the

following fashion:

– PIRQ[A]# is connected to

IRQ16.

– PIRQ[B]# is connected to

IRQ17.

– PIRQ[C]# is connected to

IRQ18.

– PIRQ[D]# is connected to

IRQ19.

This frees the ISA interrupts.

PIRQ[H:E]#/

GPIO[5:2]

• These signals require a pull-up resistor.

•2.7 k

Ω ± 5% pull-up to VCC_5 or an

8.2 k

Ω± 5% pull-up to 3.3 V.

• These signals are connected to

the internal I/O APIC in the

following fashion:

– PIRQ[E]# is connected to

IRQ20.

– PIRQ[F]# is connected to

IRQ21.

– PIRQ[G]# is connected to

IRQ22.

– PIRQ[H]# is connected to

IRQ23.

This frees the ISA interrupts.

SERIRQ • 8.2 k

Ω ± 5% pull-up to 3.3 V. • Open drain signal.

LAN Interface

LAN_CLK,

LAN_RXD[2:0],

LAN_TXD[2:0],

LAN_RSTSYNC

• Connect to Platform LAN Connect Device. • Refer to Section 9.7.

• LAN Connect Interface Signals

can be left as NC if not used

because the Input buffers are

internally terminated.

Miscellaneous Signals

SPKR • No extra pull-up resistors. • Refer to Section 9.2.

TP[0] • 8.2 k

Ω – 10 kΩ pull-up to VCCSUS3_3.

AC_SDOUT • No extra pull-down needed. • This ball has a weak internal

pull-down.

Table 13-3. Intel

ICH3-S Schematic Checklist (Sheet 3 of 6)

Checklist Items Recommendations Comments