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M29W512B Datasheet(PDF) 5 Page - STMicroelectronics |
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M29W512B Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 18 page 5/18 M29W512B Table 4. Commands Note: X Don’t Care, PA Program Address, PD Program Data. All values in the table are in hexadecimal. The Command Interface only uses address bits A0-A10 to verify the commands, the upper address bits are Don’t Care. Read/Reset. After a Read/Reset command, read the memory as normal until another command is issued. Auto Select. After an Auto Select command, read Manufacturer ID or Device ID. Program, Unlock Bypass Program, Chip Erase. After these commands read the Status Register until the Program/Erase Controller com- pletes and the memory returns to Read Mode. Unlock Bypass. After the Unlock Bypass command issue Unlock Bypass Program or Unlock Bypass Reset commands. Unlock Bypass Reset. After the Unlock Bypass Reset command read the memory as normal until another command is issued. Command Bus Write Operations 1st 2nd 3rd 4th 5th 6th Addr Data Addr Data Addr Data Addr Data Addr Data Addr Data Read/Reset 1X F0 3 555 AA 2AA 55 X F0 Auto Select 3 555 AA 2AA 55 555 90 Program 4 555 AA 2AA 55 555 A0 PA PD Unlock Bypass 3 555 AA 2AA 55 555 20 Unlock Bypass Program 2X A0 PA PD Unlock Bypass Reset 2 X 90 X 00 Chip Erase 6 555 AA 2AA 55 555 80 555 AA 2AA 55 555 10 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. The commands are summarized in Table 4, Com- mands. Refer to Table 4 in conjunction with the text descriptions below. Read/Reset Command. The Read/Reset com- mand returns the memory to its Read mode where it behaves like a ROM or EPROM. 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. If the Read/Reset command is issued during a Chip Erase operation the memory will take about 10µs to abort the Chip Erase. During the abort pe- riod no valid data can be read from the memory. Issuing a Read/Reset command during a Chip Erase operation will leave invalid data in the mem- ory. Auto Select Command. The Auto Select com- mand is used to read the Manufacturer Code and the Device Code. Three consecutive Bus Write op- erations are required to issue the Auto Select com- mand. Once the Auto Select command is issued the memory remains in Auto Select mode until an- other command is issued. 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 Manufacturer Code for STMicroelectronics is 20h. 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. The Device Code for the M29W512B is 27h. Program Command. The Program command can be used to program a value to one address in the memory array at a time. The command re- quires four Bus Write operations, the final write op- eration latches the address and data in the internal state machine and starts the Program/Erase Con- troller. |
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