AM79C976 datasheet(145/309 Pages) AMD

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Am79C976

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P R E L I M INARY

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Offset 1A0h

This register is used to control and indirectly access the

Memory Built-in Self-Test (MBIST) logic that automati-

cally tests the external SSRAM.

The contents of this register are cleared to 0 when the

RST pin is asserted. The register is not cleared at the

start of a serial EEPROM read operation or after a se-

rial EEPROM read error.

Table 51. DATAMBIST: Memory Built-in Self-Test Access Register

02h

PCnet-PCI controller

32-bit software structures,

non-burst or burst access

32-bit software structures, non-

burst access only

03h

PCnet-PCI

controller

32-bit software structures,

non-burst or burst access

32-bit software structures, non-

burst or burst access

04h

VLAN

Not used

32-bit software structures, non-

burst or burst access

05h

64-bit address

Not used

32-bit software structures, 32-

byte descriptors, non-burst or

burst access

All Other

Reserved

Undefined

SWSTYLE

[7:0]

Style

Name

SSIZE32

Initialization Block Entries

Descriptor Ring Entries

Bit

Name

Description

DM_DONE

MBIST done indicator. This bit is set to 1 when the automatic memory test has stopped, either

because the test has completed or because an error was detected. It is cleared to 0 when either

DM_START or DM_RESUME is set.

This bit is read-only.

DM_ERROR

MBIST error indicator. This bit is set to 1 when the memory test logic has detected a memory error.

It is cleared to 0 when either DM_START or DM_RESUME is set.

This bit is read-only.

DM_START

MBIST Start. Setting this bit to 1 resets the MBIST logic, including the DM_ERROR and

DM_TEST_FAIL bits, and starts the memory test process. DM_START should not be set at the

same time that the DM_RESUME bit is set.

DM_START is automatically cleared when the memory test stops. This bit is read/write.

DM_RESUME

MBIST Resume. Setting this bit to 1 restarts the memory test sequence at the point where it last

stopped. Setting this bit clears the DM_ERROR bit, but it does not clear the DM_TEST_FAIL bit.

This bit should not be set at the same time that the DM_START bit is set.

DM_RESUME is automatically cleared when the memory test stops. This bit is read/write.

DM_FAIL_STOP

MBIST Stop on Failure Control. When this bit is set to 1, the memory test will stop each time an

error is detected. When this bit is cleared to 0, the memory test will run to completion, regardless

of the number of errors that are detected.

This bit is read/write.

DM_TEST_FAIL

MBIST Test Failure Indicator. This bit is set when a memory test error is detected. It is reset when

DM_START is set to 1. It is not cleared when DM_RESUME is set to 1.

This bit is read-only.

RES

Reserved. Written as 0, read as undefined.

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