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TMS28F400BZB90BDBJL Datasheet(PDF) 8 Page - Texas Instruments

Part # TMS28F400BZB90BDBJL
Description  8-BIT/262144 BY 16-BIT BOOT-BLOCK FLASH MEMORIES
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMS28F400BZB90BDBJL Datasheet(HTML) 8 Page - Texas Instruments

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TMS28F400BZT, TMS28F400BZB
524288 BY 8-BIT/262144 BY 16-BIT
BOOT-BLOCK FLASH MEMORIES
SMJS400E – JUNE 1994 – REVISED JANUARY 1998
8
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
byte-wide or word-wide mode selection (continued)
Table 4. Operation Modes for Word-Wide Mode (BYTE = VIH)
MODE
E
G
RP
W
A9
A0
VPP
DQ0 – DQ15
Read
VIL
VIL
VIH
VIH
X
X
X
Data out
VIL
VIL
VIH
VIH
VID
VIL
X
Manufacturer-equivalent code 0089h
Algorithm-selection mode
VIL
VIL
VIH
VIH
VID
VIH
X
Device-equivalent code 4470h
(top boot block)
VIL
VIL
VIH
VIH
VID
VIH
X
Device-equivalent code 4471h
(bottom boot block)
Output disable
VIL
VIH
VIH
VIH
X
X
X
Hi-Z
Standby
VIH
X
VIH
X
X
X
X
Hi-Z
Reset / deep power down
X
X
VIL
X
X
X
X
Hi-Z
Write (see Note 1)
VIL
VIH
VIH or
VHH
VIL
X
X
VPPL or
VPPH
Data in
X = Don’t care
NOTE 1: When writing commands to the ’28F400BZx, VPP must be VPPH for block-erase or program commands to be executed and RP must
be held at VHH for the entire boot-block program or erase operation.
Table 5. Operation Modes for Byte-Wide Mode (BYTE = VIL)
MODE
E
G
RP
W
A9
A0
VPP
DQ15 / A –1
DQ8 – DQ14
DQ0 – DQ7
Read lower byte
VIL
VIL
VIH
VIH
X
X
X
VIL
Hi-Z
Data out
Read upper byte
VIL
VIL
VIH
VIH
X
X
X
VIH
Hi-Z
Data out
VIL
VIL
VIH
VIH
VID
VIL
X
X
Hi-Z
Manufacturer-equivalent
code 89h
Algorithm-selection
Device-equivalent code
g
mode
VIL
VIL
VIH
VIH
VID
VIH
X
X
Hi Z
q
70h (top boot block)
VIL
VIL
VIH
VIH
VID
VIH
X
X
Hi-Z
Device-equivalent code
71h (bottom boot block)
Output disable
VIL
VIH
VIH
VIH
X
X
X
X
Hi-Z
Hi-Z
Standby
VIH
X
VIH
X
X
X
X
X
Hi-Z
Hi-Z
Reset / deep power
down
X
X
VIL
X
X
X
X
X
Hi-Z
Hi-Z
Write (see Note 1)
VIL
VIH
VIH or
VHH
VIL
X
X
VPPL
or
VPPH
X
Hi-Z
Data in
X = Don’t care
NOTE 1: When writing commands to the ’28F400BZx, VPP must be VPPH for block-erase or program commands to be executed and RP must
be held at VHH for the entire boot-block program or erase operation.
command state machine operations
The CSM decodes instructions for clear status-register, read array, read algorithm-selection code, read
status-register, program, erase, erase-suspend, and erase-resume operations. The 8-bit command code is
input to the device on DQ0 – DQ7 (see Table 1 for CSM codes). During a program or erase cycle, the CSM
informs the WSM that a program or erase cycle has been requested. During a program cycle, the WSM controls
the program sequences and the CSM responds only to status reads.


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