參數(shù)資料
型號： M29KW016E100M1T
廠商： STMICROELECTRONICS
元件分類： PROM
英文描述： 1M X 16 FLASH 12V PROM, 100 ns, PDSO44
封裝： 0.525 INCH, PLASTIC, SO-44
文件頁數(shù)： 2/33頁
文件大小： 705K
代理商： M29KW016E100M1T
Obsolete
Product(s)
- Obsolete
Product(s)
M29KW016E
10/33
COMMAND INTERFACE
All Bus Write operations to the memory are inter-
preted by the Command Interface. Commands
consist of one or more sequential Bus Write oper-
ations. Failure to observe a valid sequence of Bus
Write operations will result in the memory return-
ing to Read mode. The long command sequences
are imposed to maximize data security. Refer to
Table 4. and Table 5., for a summary of the com-
mands.
Read/Reset Command
The Read/Reset command returns the memory to
its Read mode where it behaves like a ROM or
EPROM, unless otherwise stated. It also resets
the errors in the Status Register. Either one or
three Bus Write operations can be used to issue
the Read/Reset command.
The Read/Reset Command can be issued, be-
tween Bus Write cycles before the start of a pro-
gram or erase operation, to return the device to
read mode. Once the program or erase operation
has started the Read/Reset command is no longer
accepted. The Read/Reset command is executed
regardless of the value of VPP (VIL, VIH or VHH).
Auto Select Command
The Auto Select command is used to read the
Manufacturer Code and the Device Code. Three
consecutive Bus Write operations are required to
issue the Auto Select command. Once the Auto
Select command is issued the memory remains in
Auto Select mode until a Read/Reset command is
issued, all other commands are ignored. The Auto
Select command is executed regardless of the val-
ue of VPP (VIL, VIH or VHH).
From the Auto Select mode the Manufacturer
Code can be read using a Bus Read operation
with A0 = VIL and A1 = VIL. The other address bits
may be set to either VIL or VIH.
The Device Code can be read using a Bus Read
operation with A0 = VIH and A1 = VIL. The other
address bits may be set to either VIL or VIH.
Word Program Command
The Word Program command can be used to pro-
gram a Word to the memory array. VPP must be
set to VHH during Word Program. If VPP is set to ei-
ther VIL or VIH the command will be ignored, the
data will remain unchanged and the device will re-
vert to Read/Reset mode. The command requires
four Bus Write operations, the final write operation
latches the address and data in the internal state
machine and starts the Program/Erase Controller.
During the program operation the memory will ig-
nore all commands. It is not possible to issue any
command to abort or pause the operation. Typical
program times are given in Table 6.. Bus Read op-
erations during the program operation will output
the Status Register on the Data Inputs/Outputs.
See the section on the Status Register for more
details.
After the program operation has completed the
memory will return to the Read mode, unless an
error has occurred. When an error occurs the
memory will continue to output the Status Regis-
ter. A Read/Reset command must be issued to re-
set the error condition and return to Read mode.
Note that the Program command cannot change a
bit set at ’0’ back to ’1’. One of the Erase Com-
mands must be used to set all the bits in a block or
in the whole memory from ’0’ to ’1’.
Multiple Word Program Command
The Multiple Word Program command can be
used to program large streams of data. It greatly
reduces the total programming time when a large
number of Words are written to the memory at any
one time. VPP must be set to VHH during Multiple
Word Program. If VPP is set to either VIL or VIH the
command will be ignored, the data will remain un-
changed and the device will revert to Read/Reset
mode.
It has four phases: the Setup Phase to initiate the
command, the Program Phase to program the
data to the memory, the Verify Phase to check that
the data has been correctly programmed and re-
program if necessary and the Exit Phase.
Setup Phase. The Multiple Word Program com-
mand requires three Bus Write operations to ini-
tiate the command (refer to Table 5., Multiple
Word Program Flowchart). The Status Register
Toggle bit (DQ6) should be checked to verify that
the operation has started and the Multiple Word
Program bit (DQ0) checked to verify that the P/
E.C. is ready for the first Word.
Program Phase. The Program Phase requires
n+1 cycles, where n is the number of Words, to ex-
ecute the programming phase (refer to Table
Three successive steps are required to issue and
execute the Program Phase of the command.
1.
The fourth Bus Write operation of the
command latches the Start Address and the
first Word to be programmed. The Status
Register Multiple Word Program bit (DQ0)
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