S29CD032G datasheet(48/93 Pages) SPANSION

48 / 93 page

S29CD032G

30606B0 March 22, 2004

Ad va n c e

In f o rm a t i o n

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 generates the program pulses and

verifies the programmed cell margin. Tables 19 and 20 show the address and

data requirements for the program command sequence.

During the Embedded Program algorithm, the system can determine the status

of the program operation by using DQ7, DQ6, or RY/BY#. (See Write Operation

Status for information on these status bits.) When the Embedded Program algo-

rithm is complete, the device returns to reading array data and addresses are no

longer latched. Note that an address change is required to begin read valid array

data.

Except for Program Suspend, any commands written to the device during the Em-

bedded Program Algorithm are ignored. Note that a hardware reset

immediately terminates the programming operation. The command sequence

should be reinitiated once that bank has returned to reading array data, to ensure

data integrity.

Programming is allowed in any sequence and across sector boundaries. A bit

cannot be programmed from a “0” back to a “1”. Attempting to do so may

halt the operation and set DQ5 to “1,” or cause the Data# Polling algorithm to

indicate the operation was successful. However, a succeeding read will show that

the data is still “0”. Only erase operations can convert a “0” to a “1”.

Accelerated Program Command

The Accelerated Chip Program mode is designed to improve the Word or Double

Word programming speed. Improving the programming speed is accomplished by

using the ACC pin to supply both the wordline voltage and the bitline current in-

stead of using the VPP pump and drain pump, which is limited to 2.5 mA. Because

the external ACC pin is capable of supplying significantly large amounts of current

compared to the drain pump, all 32 bits are available for programming with a sin-

gle programming pulse. This is an enormous improvement over the standard 5-

bit programming. If the user is able to supply an external power supply and con-

nect it to the ACC pin, significant time savings are realized.

In order to enter the Accelerated Program mode, the ACC pin must first be taken

to VHH (12 V ± 0.5 V) and followed by the one-cycle command with the program

address and data to follow. The Accelerated Chip Program command is only exe-

cuted when the device is in Unlock Bypass mode and during normal read/reset

operating mode.

In this mode, the write protection function is bypassed unless the PPB Lock Bit =

The Accelerated Program command is not permitted if the SecSi sector is

enabled.

Unlock Bypass Command Sequence

The unlock bypass feature allows the system to program words to the device

faster than using the standard program command sequence. The unlock bypass

command sequence is initiated by first writing two unlock cycles. This is followed

by a third write cycle containing the unlock bypass command, 20h. The device

then enters the unlock bypass mode. A two-cycle unlock bypass program com-

mand sequence is all that is required to program in this mode. The first cycle in

this sequence contains the unlock bypass program command, A0h; the second

S29CD032G Datasheet(PDF) 48 Page - SPANSION

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