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TMS28F004AZB80CDCDL Datasheet(PDF) 19 Page - Texas Instruments

Part No. TMS28F004AZB80CDCDL
Description  524288 BY 8-BIT/262144 BY 16-BIT AUTO-SELECT BOOT-BLOCK FLASH MEMORIES
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TMS28F004AZB80CDCDL Datasheet(HTML) 19 Page - Texas Instruments

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TMS28F004Axy, TMS28F400Axy
524288 BY 8-BIT/262144 BY 16-BIT
AUTO-SELECT BOOT-BLOCK FLASH MEMORIES
SMJS829A – JANUARY 1996 – REVISED AUGUST 1997
19
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
BUS
OPERATION
COMMAND
COMMENTS
Write
Write erase
setup
Data = 20h
Block Addr = Address
within
block to
be
erased
Write
Erase
Data = D0h
Block Addr = Address
within
block to
be
erased
Read
Status-register data.
Toggle G or E to update
status register
Standby
Check SB7
1 = Ready, 0 = Busy
Repeat for subsequent blocks
Write FFh after the last block-erase operation to reset the
device to read-array mode.
BUS
OPERATION
COMMAND
COMMENTS
Standby
Check SB3
1 = Detect VPP low
(see Note B)
Standby
Check SB4 and SB5
1 = Block-erase
error
Standby
Check SB5
1 = Block-erase error
(see Note C)
NOTES: A. Full status-register check can be done after each word or after a sequence of words.
B. SB3 must be cleared before attempting additional program / erase operations.
C. SB5 is cleared only by the clear-status-register command in cases where multiple blocks are erased before full status is checked.
Figure 5. Automated Block-Erase Flow Chart
Start
Issue Erase-Setup Command
and Block Address
Issue Block-Erase-Confirm
Command and
Block Address
Read Status-Register Bits
SB7 = 1
?
No
Full Status-Register
Check (optional)
See Note A
Yes
Block-Erase Completed
FULL STATUS-REGISTER-CHECK FLOW
SB3 = 0
?
No
Yes
VPP Range Error
SB4 = 1,
SB5 = 1
?
Yes
No
Command Sequence
Error
Block-Erase Passed
Erase
Suspend
?
Yes
No
Erase-
Suspend
Loop
SB5 = 0
?
No
Block-Erase Failed
Yes
Read Status-Register
Bits


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