AM79C976 Advanced Micro Devices, AM79C976 Datasheet - Page 146

• Manufacturer Part Number: AM79C976
• Description: PCnet-PRO 10/100 Mbps PCI Ethernet Controller
• Manufacturer: Advanced Micro Devices

146
55-54
53-52
51-32
31-0
Bit
56
DM_FAIL_STATE
DM_BACKG
DM_ADDR
DM_DATA
DM_DIR
Name
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.
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.
MBIST Background. This field contains the background pattern that the memory test logic was
using when the test stopped.
This field is read-only.
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.
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.
DM_DIR
0
0
0
0
1
1
1
1
P R E L I M I N A R Y
FAIL_STATE
Am79C976
00
01
10
11
00
01
10
11
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
Description
Error Location
8/01/00