AM79C976 datasheet(149/309 Pages) AMD

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Am79C976

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P R E L I M INARY

Table 54. Interface Pin Assignment

2ECS

EEPROM Chip Select. This bit is used to control the value of the EECS pin of the interface when

the EEN bit is set to 1 and the PREAD bit is set to 0. If EEN = 1 and PREAD = 0 and ECS is set to

a 1, then the EECS pin will be forced to a HIGH level at the rising edge of the next clock following

bit programming.

If EEN = 1 and PREAD = 0 and ECS is set to a 0, then the EECS pin will be forced to a LOW level

at the rising edge of the next clock following bit programming. ECS has no effect on the output value

of the EECS pin unless the PREAD bit is set to 0 and the EEN bit is set to 1.

ESK

EEPROM Serial Clock. This bit and the EDI/EDO bit are used to control host access to the

EEPROM. Values programmed to this bit are placed onto the EESK pin at the rising edge of the

next clock following bit programming, except when the PREAD bit is set to 1 or the EEN bit is set

to 0. If both the ESK bit and the EDI/EDO bit values are changed during the same register write

operation, while EEN = 1, then setup and hold times of the EEDI pin value with respect to the EESK

signal edge are not guaranteed.

ESK has no effect on the EESK pin unless the PREAD bit is set to 0 and the EEN bit is set to 1.

EDI/EDO

EEPROM Data In/EEPROM Data Out. Data that is written to this bit will appear on the EEDI output

of the interface, except when the PREAD bit is set to 1 or the EEN bit is set to 0. Data that is read

from this bit reflects the value of the EEDO input of the interface.

EDI/EDO has no effect on the EEDI pin unless the PREAD bit is set to 0 and the EEN bit is set to 1.

Bit

Name

Description

567 Pin

PREAD or Auto

Read in Progress

EEN

EECS

EESK

EEDI

Low

Tri-State

High

Active

High

From ECS Bit

From ESK Bit

From EDI Bit

High

LED1

LED0

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