S71GS256 datasheet(74/195 Pages) SPANSION

74 / 195 page

S29GLxxxN MirrorBitTM Flash Family

S29GLxxxN_MCP_A1 December 15, 2004

Advan ce

In form ati o n

Figure 4. Erase Operation

Erase Suspend/Erase Resume Commands

The Erase Suspend command, B0h, allows the system to interrupt a sector erase

operation and then read data from, or program data to, any sector not selected

for erasure. This command is valid only during the sector erase operation, includ-

ing the 50 µs time-out period during the sector erase command sequence. The

Erase Suspend command is ignored if written during the chip erase operation or

Embedded Program algorithm.

When the Erase Suspend command is written during the sector erase operation,

the device requires a typical of 5 µs (maximum of 20 µs) to suspend the erase

operation. However, when the Erase Suspend command is written during the sec-

tor erase time-out, the device immediately terminates the time-out period and

suspends the erase operation.

After the erase operation has been suspended, the device enters the erase-sus-

pend-read mode. The system can read data from or program data to any sector

not selected for erasure. (The device “erase suspends” all sectors selected for

erasure.) Reading at any address within erase-suspended sectors produces sta-

tus information on DQ7–DQ0. The system can use DQ7, or DQ6 and DQ2

together, to determine if a sector is actively erasing or is erase-suspended. Refer

to the Write Operation Status section for information on these status bits.

After an erase-suspended program operation is complete, the device returns to

the erase-suspend-read mode. The system can determine the status of the pro-

START

Write Erase

Command Sequence

(Notes 1, 2)

Data Poll to Erasing

Bank from System

Data = FFh?

Yes

Erasure Completed

Embedded

Erase

algorithm

in progress

Notes:

1. See Table 12 for program command sequence.

2. See the section on DQ3 for information on the sector

erase timer.

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