S71PL254 datasheet(71/196 Pages) SPANSION

71 / 196 page

August 12, 2004 S29PL127J_064J_032J_MCP_00_A3

S29PL127J/S29PL064J/S29PL032J for MCP

Advance

I n f o rmatio n

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. The bank address is required when writing this command. This com-

mand is valid only during the sector erase operation, including the 80 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 maximum of 35 µs to suspend the erase operation. How-

ever, when the Erase Suspend command is written during the sector erase

time-out, the device immediately terminates the time-out period and suspends

the erase operation. Addresses are “don’t-cares” when writing the Erase suspend

command.

After the erase operation has been suspended, the bank 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 bank returns to the

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

Notes:

1. See Table 17 for erase command sequence.

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

Figure 5. Erase Operation

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

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