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TMS28F200AST Datenblatt(PDF) 18 Page - Texas Instruments

Teilenummer TMS28F200AST
Bauteilbeschribung  262144 BY 8-BIT/131072 BY 16-BIT AUTO-SELECT BOOT-BLOCK FLASH MEMORIES
PDF  79 Pages
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMS28F200AST Datenblatt(HTML) 18 Page - Texas Instruments

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TMS28F002Axy, TMS28F200Axy
262144 BY 8-BIT/131072 BY 16-BIT
AUTO-SELECT BOOT-BLOCK FLASH MEMORIES
SMJS826D – JANUARY 1996 – REVISED SEPTEMBER 1997
18
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 block or after a sequence of blocks.
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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