IDT 89HPES34H16, User Manual, Page: 57 / 182

Notes
PES34H16 User Manual 5 - 1 October 30, 2008
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Chapter 5
General Purpose I/O
Introduction
The PES34H16 has 32 General Purpose I/O (GPIO) pins that may be individually configured as: general
purpose inputs, general purpose outputs, or alternate functions. GPIO pins are controlled by the General
Purpose I/O Function (GPIOFUNC), General Purpose I/O Configuration (GPIOCFG), and General Purpose
I/O Data (GPIOD) registers in the upstream port’s PCI configuration space. As shown in Table 5.1, many
GPIO pins are shared with other on-chip functions. The GPIO Function (GPIOFUNC) register whether a
GPIO bit operates as a general purpose I/O or as the specified alternate function.
GPIO
Pin
Alternate
Function
Pin Name
Alternate Function Description
Alternate
Function
Pin Type
5 GPEN General purpose event output Output
6 P1RSTN Reset output for downstream port 1 Output
7 P2RSTN Reset output for downstream port 2 Output
8 P3RSTN Reset output for downstream port 3 Output
9 P4RSTN Reset output for downstream port 4 Output
10 P5RSTN Reset output for downstream port 5 Output
11 P6RSTN Reset output for downstream port 6 Output
12 P7RSTN Reset output for downstream port 7 Output
13 P8RSTN Reset output for downstream port 8 Output
14 P9RSTN Reset output for downstream port 9 Output
15 P10RSTN Reset output for downstream port 10 Output
16 P11RSTN Reset output for downstream port 11 Output
17 P12RSTN Reset output for downstream port 12 Output
18 P13RSTN Reset output for downstream port 13 Output
19 P14RSTN Reset output for downstream port 14 Output
20 P15RSTN Reset output for downstream port 15 Output
21 IOEXPINTN0 SMBus I/O expander interrupt 0 Input
22 IOEXPINTN1 SMBus I/O expander interrupt 1 Input
23 IOEXPINTN2 SMBus I/O expander interrupt 2 Input
24 IOEXPINTN3 SMBus I/O expander interrupt 3 Input
25 IOEXPINTN4 SMBus I/O expander interrupt 4 Input
26 IOEXPINTN5 SMBus I/O expander interrupt 5 Input
Table 5.1 General Purpose I/O Pin Alternate Function (Part 1 of 2)