ESS Technology, Inc.

SAM0368-030601

5

ES1988 PRODUCT BRIEF

SDI2

56

I

External AC-link serial data input. Select secondary codec by enabling Allegro_Base+38h [5] =

1.

GPIO8

I/O

General-purpose input/output.

OSCI

57

I

49.152-MHz crystal input.

OSCO

58

O

49.152-MHz crystal output.

SRESET2#

59

O

Reset output for AC-Link interface. Select secondary codec by enabling Allegro_Base+38h [5] =

1.

GPIO3

I/O

General-purpose input/output.

SDFS2

60

O

Serial data frame sync output for AC-Link interface. Select secondary codec by enabling

Allegro_Base+38h [5] = 1.

GPIO9

I/O

General-purpose input/output.

(note)

If a pull-down resistor is used on this pin, the ES1988 is configured as a multifunction device

(audio-modem). Otherwise, the ES1988 is configured as a single function audio-only device.

SCLK2

61

O

Serial clock for AC-link interface. Select secondary codec by enabling Allegro_Base+38h [5] = 1.

GPIO10

I/O

General-purpose input/output.

SDO2

62

O

External AC-link serial data output. Select secondary codec by enabling Allegro_Base+38h [5] =

1.

GPIO11

I/O

General-purpose input/output.

VAUXD

I

down.

PCGNT#

63

I

PC/PCI grant input. Enable PC/PCI by setting PCI 50h [10:8] = 010. Select PCGNT# from pin 63

by setting Allegro_Base+58h [6] = 0. Either pin 54 or pin 63 may be used for PCGNT#.

GT0#

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 63 by enabling PCI 58h [10] = 1. Pin 51 may also be used as

GT0#/GSO.

GS0

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 63

by enabling PCI 58h [10] = 1. Pin 51 may also be used as GT0#/GSO.

GPIO12

I/O

General-purpose input/output.

PC_BEEP

64

I

PC Speaker input.

PHONE

65

I

Mono input.

CD_L

66

I

CD-audio left channel input.

CD_GND

67

I

CD-audio ground input.

CD_R

68

I

CD-audio right channel input.

MIC

69

I

Microphone input.

LINE_IN_L

70

I

Line left channel input.

LINE_IN_R

71

I

Line right channel input.

AVDD[2:1]

83, 72

I

Analog supply voltage, 5V.

AVSS[2:1]

82, 73

I

Analog ground.

VREF

74

O

Reference voltage.

Table 1

ES1988 Pin Descriptions (Continued)

Names

Pin Numbers

I/O

Descriptions