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IS25F011A

1M-BIT, 2M-BIT, AND 4M-BIT SERIAL FLASH MEMORIES WITH 4-PIN SPI INTERFACE

Integrated Silicon Solution 

IS25F011A

IS25F021A

IS25F041A

ISSI ®

Transfer Sector to SRAM

The Transfer Sector to SRAM command (54H) allows the

contents of a sector to be transferred directly to the SRAM

without having to read the sector out of the device and

rewrite it into the SRAM. The command is similar to the

Write to Sector command except that instead of inputting

data from the SI pin, the data is taken from the specified

sector and is transferred to the SRAM. Every eight clocks

on SCK, a byte from the specified sector to the SRAM will

Transfer Sector

to SRAM

Sector

Command Address*

Byte

Address**

SI

54H

S[15:0]

B[15:0]

be transferred. Although data on SI is ignored, it is recom-

mended to write data bytes of 00H in order to support the

clocking requirements. During the transfer, the SO output

is in a high-impedance state. When the last byte address

is transferred, the command can be completed by issuing

eight more control clocks and asserting CS high. If the

clock continues to increment past the highest byte-ad-

dress (107H), the address counter will roll over to byte-0H.

8 Clocks per Byte Trasnfered

from First Byte to Last Byte

SI=00H During Byte Ttansfers

8 Clocks

00H

SO

*The sector address only uses bits [8:0], [9:0] or [10:0]

**The byte address only uses bits [8:0]

Compare Sector to SRAM

The Compare Sector to SRAM command does a bit-by-bit

comparison of the data stored in the addressed sector

against data in the SRAM. The command is similar to the

Read from Sector command except that data is not read

out of the Serial Output pin (SO). Instead, the SO pin

provides a bit-by-bit compare of each sector and SRAM

bit. A high (1) per bit will be output if the bit compare is

equal. A low (0) per bit will be output if the bit compare is

not equal. The compare can start from any location in the

264-byte range as specified by the byte-address field

B[15:0]. The byte-address counter is automatically

incremented and will wrap around to the first address (0H)

if it passes the last address (107H). If any of the compared

bits are not equal, then the Compare Not Equal (CNE) bit

in the Status Register is set to a 1. This bit will stay set until

a Clear Compare Status command has been issued.

Compare Sector

with SRAM Sector

Command Address*

Byte

Address** 16 Clocks

SI

86H

S[15:0]

B[15:0]

0000H

SO

*The sector address only uses bits [8:0], [9:0] or [10:0]

**The byte address only uses bits [8:0]

RB[15:0]

Read/Busy

Status

First Byte - Last Byte

Bit Compare of Sector

and SRAM

14

Integrated Silicon Solution, Inc.

PRELIMINARY SF001-1A

06/24/98

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