Command interface
M58LT256JST, M58LT256JSB
4.3
Read Electronic Signature command
The Read Electronic Signature command reads the manufacturer and device codes, the
Protection Status of the addressed bank, the Protection Register, and the 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
outputs the manufacturer code, the device code, the protection status of the addressed
bank, the Protection Register, or the Configuration Register (see Table 8).
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 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 reads data from the CFI.
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 read from the
common Flash interface.
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 parameter
bank and the CFI memory space are not allowed (see Table 15: Dual operation limitations
for details).
See Appendix B: Common Flash interface, Tables 35, 36, 37, 38, 39, 40, 41, 42, 43 and 44
for details on the information contained in the common Flash interface memory area.
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