S71PL254 datasheet(67/196 Pages) SPANSION

67 / 196 page

August 12, 2004 S29PL127J_064J_032J_MCP_00_A3

S29PL127J/S29PL064J/S29PL032J for MCP

Advance

I n f o rmatio n

The reset command may be written between the sequence cycles in an autoselect

command sequence. Once in the autoselect mode, the reset command must be

written to return to the read mode. If a bank entered the autoselect mode while

in the Erase Suspend mode, writing the reset command returns that bank to the

erase-suspend-read mode.

If DQ5 goes high during a program or erase operation, writing the reset command

returns the banks to the read mode (or erase-suspend-read mode if that bank

was in Erase Suspend).

Autoselect Command Sequence

The autoselect command sequence allows the host system to access the manu-

facturer and device codes, and determine whether or not a sector is protected.

The autoselect command sequence may be written to an address within a bank

that is either in the read or erase-suspend-read mode. The autoselect command

may not be written while the device is actively programming or erasing in the

other bank.

The autoselect command sequence is initiated by first writing two unlock cycles.

This is followed by a third write cycle that contains the bank address and the au-

toselect command. The bank then enters the autoselect mode. The system may

read any number of autoselect codes without reinitiating the command sequence.

Table 17 shows the address and data requirements. To determine sector protec-

tion information, the system must write to the appropriate bank address (BA) and

sector address (SA). Table 3 shows the address range and bank number associ-

ated with each sector.

The system must write the reset command to return to the read mode (or erase-

suspend-read mode if the bank was previously in Erase Suspend).

Enter Secured Silicon Sector/Exit Secured Silicon Sector Command

Sequence

The Secured Silicon Sector region provides a secured data area containing a ran-

dom, eight word electronic serial number (ESN). The system can access the

Secured Silicon Sector region by issuing the three-cycle Enter Secured Silicon

Sector command sequence. The device continues to access the Secured Silicon

Sector region until the system issues the four-cycle Exit Secured Silicon Sector

command sequence. The Exit Secured Silicon Sector command sequence returns

the device to normal operation. The Secured Silicon Sector is not accessible when

the device is executing an Embedded Program or embedded Erase algorithm.

Table 17 shows the address and data requirements for both command sequences.

See also “Secured Silicon Sector Flash Memory Region” for further information.

Note that the ACC function and unlock bypass modes are not available when the

Secured Silicon Sector is enabled.

Word Program Command Sequence

Programming is a four-bus-cycle operation. The program command sequence is

initiated by writing two unlock write cycles, followed by the program set-up com-

mand. The program address and data are written next, which in turn initiate the

Embedded Program algorithm. The system is not required to provide further con-

trols or timings. The device automatically provides internally generated program

pulses and verifies the programmed cell margin. Table 17 shows the address and

data requirements for the program command sequence. Note that the Secured

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