4

SAM0368-030601

ESS Technology, Inc.

ES1988 PRODUCT BRIEF

GD[3]

45

I/O

Game port data input/output.

ECLK

O

Clock output to EEPROM clock input. ECLK goes active after power-on reset and goes inactive

automatically after EEPROM cycle is complete.

VOLDN#

I

Hardware volume control (volume down). Used in combination with pin 44 (VOLUP#). Hardware

volume control is enabled by setting PCI 52 [7] = 1. Pins 44:45 are selected for hardware volume

control by setting PCI 52h [5] = 1. Pins 53:54 may also be used for hardware volume control.

GD[4]

46

I

Game port data input.

GD[5:7]

47:49

I

Game port data input.

GPIO[13:15]

I/O

General-purpose input/output.

I2SCLK

50

I

SIRQ#

I/O

Serial interrupt request. Optional PC/PCI system implementation. Serial IRQ is enabled by

setting PCI 40h [14] = 1.

GPIO4

I/O

General-purpose input/output.

I2SLR

51

I

GTO#

O

Grant to PCI master. GTO# is enabled by setting PCIx2 arbiter bits PCI 58h [0] = 1 and PCI 58h

[11] = 1. Select GT0#/GSO from pin 51 by enabling PCI 58h [10] = 0. Pin 63 may also be used as

GT0#/GSO.

GSO

O

Grant select 0 output to control external quick switch to grant PCI master phase. GSO is enabled

by setting PCIx2 arbiter bit PCI 58h [0] = 1 and PCI 58h [11] = 0. Select GS0/GT0# from pin 51

by enabling PCI 58h [10] = 0. Pin 63 may also be used as GT0#/GSO.

GPIO5

I/O

General-purpose input/output.

I2SDATA

52

I

R0#

I

PCI bus request 0 input from external PCI master device. RO# is enabled by setting the PCIx2

arbiter bit PCI 58h [0] = 1. Select R0# from pin 52 by enabling PCI 58h [10] = 0. Either pin 2 or

pin 52 may be used for R0#.

GPIO6

I/O

General-purpose input/output.

MC_97DI

53

I

Modem codec data input. Enabled by setting Allegro_Base+38h [3] = 1.

PCREQ#

O

PC/PCI request output. Enable PCREQ# by setting PCI 50h [10:8] = 010. Pin 53 is used as

PCREQ# when configured as an audio-only device. PCREQ# can only be used from pin 2 when

configured as a multifunction device (see pin 60 note).

VOLUP#

I

Hardware volume control (volume up). Used in combination with pin 54 (VOLDN#). Hardware

volume control is enabled by setting PCI 52 [7] = 1. Pins 53:54 are selected for hardware volume

control by setting PCI 52h [5] = 0. Pins 44:45 may also be used for hardware volume control.

GPIO7

I/O

General-purpose input/output.

PME#

54

O

PME# output to wake the system. PME is enabled by setting the PME_EN bit (PCI C5h [0] = 1).

SPDIFO

O

S/PDIF output. Enable SPDIFO by setting PCI 53h [0] = 1. Select SPDIFO from pin 54 by setting

PCI 58h [1] = 0. Either pin 2 or pin 54 may be used for SPDIFO.

PCGNT#

I

PC/PCI grant input. Enable PC/PCI by setting PCI 50h [10:8] = 010. Select PCGNT# from pin 54

by setting Allegro_Base+58h [6] = 1. Either pin 54 or pin 63 may be used for PCGNT#.

VOLDN#

I

Hardware volume control (volume down). Used in combination with pin 53 (VOLUP#). Hardware

volume control is enabled by setting PCI 52 [7] = 1. Pins 53:54 are selected for hardware volume

control by setting PCI 52h [5] = 0. Pins 44:45 may also be used for hardware volume control.

VAUX

55

I

Table 1

ES1988 Pin Descriptions (Continued)

Names

Pin Numbers

I/O

Descriptions