M58PR512LE datasheet(23/119 Pages) STMICROELECTRONICS

23 / 119 page

M58PR256LE, M58PR512LE, M58PR001LE

Command interface

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4.3

Read Electronic Signature command

The Read Electronic Signature command reads the manufacturer and device codes, the

lock status of the addressed bank, the Protection Register, the Configuration Register, and

the Enhanced Configuration Register.

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

output the manufacturer code, the device code, the lock status of the addressed bank, the

Protection Register, the Configuration Register, or the Enhanced Configuration Register

(see Table 10).

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 EFA and the electronic signature locations are not allowed (see Table 21: 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 goes into read electronic signature mode. Subsequent bus read

cycles output the electronic signature data and the Program/Erase Controller continues to

program or erase in the background.

The Read Electronic Signature command only changes 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 electronic signature. A Read Array

command is required to return the bank to read array mode.

4.4

Read CFI Query command

The Read CFI Query command is used to read data from the CFI (common Flash interface).

One bus write cycle is required to issue the Read CFI Query command. Once a bank is in

read CFI query mode, subsequent bus read operations in the same bank output the

contents of the CFI.

The Read CFI Query command can be issued at any time, even during program or erase

operations.

If a Read CFI Query command is issued to a bank that is executing a program or erase

operation the bank goes into read CFI query mode. Subsequent bus read cycles output the

CFI data and the Program/Erase Controller continues to program or erase in the

background.

The Read CFI Query command only changes 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 from the CFI. A Read Array command

is required to return the bank to read array mode.

Dual operations between the EFA and the CFI memory space are not allowed (see Table 21:

Dual operation limitations for details).

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