Specifications

System Registers 7-103
STDERA,B,C,D,E—Self-Test Data Error Registers
The function of STDERA is slightly different from the other four registers
(STDERB,C,D,E). STDERA can be written or read, while the other four
are read only. STDERA can be used by diagnostics to ensure that most of
the data path and control logic, to and from the various CSRs, is fully func-
tional.
Table 7-50 describes each field of self-test error data registers A,B,C,D.
These four registers are used to store failing self-test data bits <127:0> in
MDI0, <255:128> in MDI1, <383:256> in MDI2, and <511:384> in MDI3.
A
ddress
A
ccess
BB + 0001 0000 to 0001 C100
R/W
The four sets of STDERx_n registers are used to isolate self-test
failures down to a single failing bit or bits. When self-test is exe-
cuted any data bit error(s) that are detected by the self-test data
compare logic will set the appropriate data bit(s) in these regis-
ters. The operation and contents of this register can be affected b
y
bits <2:0> of the DDR0:3 registers in the MDI ASICs.
31 0
ADAT
31 0
ADAT
31 0
BDAT
31 0
BDAT
STDERA
STDERB
STDERC
STDERD
31 0
BXB-0754-93
RSVD
16 1519
STDERE
VRC
STDERE
18