AM79C976 datasheet(146/309 Pages) AMD

146 / 309 page

146

Am79C976

8/01/00

P R E L I M INARY

DM_DIR

MBIST Test Direction. This bit is set to 1 when the MBIST memory pointer was counting down

when the test stopped. It is cleared to 0 when the MBIST memory pointer was counting up when

the test stopped.

This bit is read-only.

55-54

DM_FAIL_STATE

MBIST Error Offset Indicator. This field indicates offset of the location of the last memory test error

with respect to the value of the DM_ADDR field. The interpretation of this field depends on the

value of the DM_DIR field, which indicates whether the address pointer was counting up or down

when the error was detected.

This field is read-only.

53-52

DM_BACKG

MBIST Background. This field contains the background pattern that the memory test logic was

using when the test stopped.

This field is read-only.

51-32

DM_ADDR

MBIST Address. This field contains the contents of the MBIST address pointer at the time that the

test stopped. Because of the pipelined nature of the external SSRAM, this value may not be the

location of the memory error. The actual error location is obtained by adding or subtracting the

contents of the DM_FAIL_STATE field as described above.

This field is read-only.

31-0

DM_DATA

MBIST Data. This field contains the last data that the memory test logic read from the external

SSRAM. If the DM_ERR and DM_FAIL_STOP bits are both set to 1, the contents of this field

contains an error.

This field is read-only.

Bit

Name

Description

DM_DIR

FAIL_STATE

Error Location

Error at DM_ADDRESS

Error at DM_ADDRESS-1

Error at DM_ADDRESS-2

Error at DM_ADDRESS-3

Error at DM_ADDRESS

Error at DM_ADDRESS+1

Error at DM_ADDRESS+2

Error at DM_ADDRESS+3

AM79C976 Datasheet(PDF) 146 Page - Advanced Micro Devices

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