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参数资料
| 型号： | TMS29LF040-80C5DBWE |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | PROM |
| 英文描述： | 512K X 8 FLASH 3V PROM, 80 ns, PDSO32 |
| 封装： | 8 X 14 MM, PLASTIC, TSOP-32 |
| 文件页数： | 38/38页 |
| 文件大小： | 495K |
| 代理商： | TMS29LF040-80C5DBWE |
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TMS29LF040, TMS29VF040
524288 BY 8-BIT
FLASH MEMORIES
SMJS825D – SEPTEMBER 1995 – REVISED JUNE 1998
9
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
erase-suspend command
The erase-suspend command (B0h) allows interruption of a sector-erase operation to read data from unaltered
sectors of the device. Erase-suspend is a one-bus-cycle command. The addresses can be VIL or VIH and the
erase-suspend command (B0h) is latched on the rising edge of W. Once the sector-erase operation is in
progress, the erase-suspend command requests the internal write-state machine to halt operation at
predetermined breakpoints. The erase-suspend command is valid only during the sector-erase operation and
is invalid during the byte-programming and chip-erase operations. The sector-erase delay timer expires
immediately if the erase-suspend command is issued while the delay is active.
After the erase-suspend command is issued, the device typically takes between 0.1
s and 15 s to suspend
the operation. The toggle bit must be monitored to determine when the suspend has been executed. When the
toggle bit stops toggling, data can be read from sectors that are not selected for erase. Reading from a sector
selected for erase can result in invalid data. See the operation status section for a full description.
Once the sector-erase operation is suspended, further writes of the erase-suspend command are ignored. The
erase-resume command (30h) causes the device to restart the suspended sector operation. To erase additional
sectors, reissue the six-cycle sector-erase command sequence. Any other command sequence written while
in suspend mode causes the device to reset to the read mode.
erase-resume command
The erase-resume command (30h) restarts a suspended sector-erase operation from where it was halted to
completion. Erase resume is a one-bus-cycle command. The addresses can be VIL or VIH and the erase-resume
command (30h) is latched on the rising edge of W. When an erase-suspend/erase-resume command
combination is written, the internal pulse counter is reset to zero and the exceed-timing-limit indicator (DQ5)
is set to logic-low. The erase-resume command is valid only in the erase-suspend state. After the erase-resume
command is executed, the device returns to the valid sector-erase state and further writes of the erase-resume
command are ignored. After the device has resumed the sector-erase operation, another erase-suspend
command can be issued to the device.
operation status
status-bit definitions
During operation of the embedded program and erase functions, the status of the device can be determined
by reading the data state of designated outputs. The data-polling bit (DQ7) and toggle bit (DQ6) require multiple
successive reads to observe a change in the state of the designated output. Table 4 defines the values of the
status flags.
Table 4. Operation Status Flags
Device Operation
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
Byte-programming in progress
DQ7
T
0
X
0
X
Byte-programming exceed time limit
DQ7
T
1
X
0
X
Byte-programming complete
D
Sector- / chip-erase in progress
0
T
0
X
1
X
Sector- / chip-erase exceed time limit
0
T
1
X
1
X
Sector- / chip-erase complete
1
T= toggle, D = data, X = data undefined, DQ7 = complement of data written to DQ7
DQ4, DQ2, DQ1, and DQ0 are reserved for future use.
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