EZ80F91MCU Datasheet, PDF (123/396 Pages) Zilog, Inc. – eZ80Acclaim-TM Flash Microcontrollers

eZ80F91 MCU
Product Specification
104
MBIST Control
There are two Memory Built-In Self-Test (MBIST) controllers for the RAM blocks
on the eZ80F91. MBIST_GPR is for General Purpose RAM and MBIST_EMR is
for EMAC RAM. Writing a 1 to MBIST_ON starts the MBIST testing. Writing a 0 to
MBIST_ON stops the MBIST testing. Upon completion of the MBIST testing,
MBIST_ON is automatically reset to 0. If RAM passes MBIST testing,
MBIST_PASS is 1. The value in MBIST_PASS is only valid when MBIST_DONE
is High. See Table 33.
Table 33. MBIST Control Register
(MBIST_GPR = 00B6h, MBIST_EMR = 00B7h)
Bit
7
6
5
4
3
2
1
0
Reset
0
0
0
0
0
0
0
0
CPU Access
R/W R
R
R
R
R
R
R
Note: R/W = Read/Write; R = Read Only.
Bit
Position
7
MBIST_ON
6
MBIST_DONE
5
MBIST_PASS
[4:0]
Value
0
1
0
1
0
1
00000
Description
MBIST Testing of the RAM is disabled.
MBIST Testing of the RAM is enabled.
MBIST Testing has not completed.
MBIST Testing has completed.
MBIST Testing has failed.
MBIST Testing has passed.
Reserved
PS019209-0504
PRELIMINARY
Random Access Memory