ez80f91 ZiLOG Semiconductor, ez80f91 Datasheet - Page 104

• Manufacturer Part Number: ez80f91
• Description: Ez80 Acclaimplus!? Connectivity Assp Ez80f91 Assp
• Manufacturer: ZiLOG Semiconductor

PS027001-0707
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. On 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 34. MBIST Control Register
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
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
(MBIST_GPR = 00B6h, MBIST_EMR = 00B7h)
R
5
0
R
4
0
R
3
0
Table
Product Specification
Random Access Memory
R
2
0
34.
eZ80F91 ASSP
R
1
0
R
0
0
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