EZ80F91MCU ZILOG [Zilog, Inc.], EZ80F91MCU Datasheet - Page 123

• Manufacturer Part Number: EZ80F91MCU
• Description: eZ80Acclaim-TM Flash Microcontrollers
• Manufacturer: ZILOG [Zilog, Inc.]

PS019209-0504
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
Reset
CPU Access
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
R/W
P R E L I M I N A R Y
7
0
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
R
6
0
R
5
0
R
4
0
R
3
0
Product Specification
Random Access Memory
R
2
0
eZ80F91 MCU
R
1
0
R
0
0
104