Table 3. Ich5-R Gpio Assignment - Intel SE7520AF2 Technical Product Specification

Functional Architecture
can be routed to the front of the server. All five ports are high-speed, full-speed, and low-speed
capable.
3.1.4.8 Real-time Clock (RTC)
The ICH5-R contains a Motorola* MC146818A-compatible real-time clock with 256 bytes of
battery backed RAM. The real-time clock performs two key functions: keeping track of the time
of day and storing system data, even when the system is powered down. The RTC operates on
a 32.768 KHz crystal and a separate 3 V lithium battery. The RTC also supports two lockable
memory ranges. By setting bits in the configuration space, two 8-byte ranges can be locked to
read and write accesses. This prevents unauthorized reading of passwords or other system
security information.
3.1.4.9 General-purpose Input/Output (GPIO)
General-purpose inputs and outputs are provided for custom system design. The number of
inputs and outputs depends on the ICH5-R configuration. All unused GPI pins must be pulled
high or low, so that they are at a predefined level and do not cause undue side effects and must
meet the following guidelines:
GPIO 0:15 sticky bits on input, level triggered, 61µs min time for latch
GPI's only: 0:15, 40-47 (note: 42-47 unimplemented)
GPO's only: 16-23, 48-55 (note: 49-55 unimplemented)
GPI or GPO: 24-39 (note: 35-39 unimplemented, GPIO[33] is changed to SATA LED
and this GPIO is NOT available)
GPIO resume (3.3VSTBY) power well: 8-15, 24-25, 27-28
GPIO core (3.3V) power well: 0-7, 16-23, 32-34, 40-41, 48
ICH5-R Signal
INTRUDER DETECT
GPI0/REQA
GPI1/REQB/REQ5#
GPI6/AGPBUSY#
GPI7
GPI8
GPI9/OC[4]#
GPI10/OC[5]#
GPI11/SMBALERT#
GPI12
GPI13
GPI14/OC[6]#
GPI15/OC[7]#
GPO16/GNTA#
GPO17/GNTB#/GNT[5]#
38

Table 3. ICH5-R GPIO Assignment

Type Pin PWR Well
Input Y12 Core
Input A5 Core
Input E7 Core
Input R5 Core
Input U3 Core
Input Y2 Resume
Input B14 Resume
Input A14 Resume
Input AC3 Resume
Input W4 Resume
Input W5 Resume
Input D13 Resume
Input C13 Resume
Output E8 Core
Output B4 Core
Intel order number C77866-003
Intel® Server Board SE7520AF2 TPS
Tolerance
3.3V TP
5V Board SKU 0
5V Board SKU 1
5V Bios Recover Boot
5V MCH PME
3.3V WAKE#/PCI PME#
Reserved for USB OC4
3.3V (3 in back, 2 in front)
3.3V MCH GPE
3.3V Board ID 0
3.3V SIO SMI
3.3V BMC IRQ SMI
3.3V SIO > ICH5R PME
3.3V Password clear
3.3V TP
3.3V TP
Description
Revision 1.2