M58LT128GS datasheet(19/98 Pages) STMICROELECTRONICS

19 / 98 page

M58LT128GST, M58LT128GSB

4 Command Interface

19/98

4.1

Read Array command

The Read Array command returns the addressed bank to Read Array mode.

One Bus Write cycle is required to issue the Read Array command. Once a bank is in Read

Array mode, subsequent read operations will output the data from the memory array.

A Read Array command can be issued to any banks while programming or erasing in another

bank.

If the Read Array command is issued to a bank currently executing a program or erase

operation, the bank will return to Read Array mode but the program or erase operation will

continue, however the data output from the bank is not guaranteed until the program or erase

operation has finished. The read modes of other banks are not affected.

4.2

Read Status Register command

The device contains a Status Register that is used to monitor program or erase operations.

The Read Status Register command is used to read the contents of the Status Register for the

addressed bank.

One Bus Write cycle is required to issue the Read Status Register command. Once a bank is in

Read Status Register mode, subsequent read operations will output the contents of the Status

The Status Register data is latched on the falling edge of the Chip Enable or Output Enable

signals. Either Chip Enable or Output Enable must be toggled to update the Status Register

data

The Read Status Register command can be issued at any time, even during program or erase

operations. The Read Status Register command will only change the read mode of the

addressed bank. The read modes of other banks are not affected. Only Asynchronous Read

and Single Synchronous Read operations should be used to read the Status Register. A Read

Array command is required to return the bank to Read Array mode.

See Table 9 for the description of the Status Register Bits.

4.3

Read Electronic Signature command

The Read Electronic Signature command is used to read the Manufacturer and Device Codes,

the Protection Status of the addressed bank, the Configuration Register and the Protection

One Bus Write cycle is required to issue the Read Electronic Signature command. Once a bank

is in Read Electronic Signature mode, subsequent read operations in the same bank will output

the Manufacturer Code, the Device Code, the Protection Status of the addressed bank, or the

Configuration Register (see Table 7).

The Read Electronic Signature command can be issued at any time, even during program or

erase operations, except during Protection Register Program operations. Dual operations

between the Parameter bank and the Electronic Signature location are not allowed (see

Table 15: Dual Operation Limitations for details).

If a Read Electronic Signature command is issued to a bank that is executing a program or

erase operation the bank will go into Read Electronic Signature mode. Subsequent Bus Read

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