NX25F080A-5TI-R データシートの表示（PDF） - NexFlash -> Winbond Electronics

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NX25F080A-5TI-R

8M-BIT SERIAL FLASH MEMORY WITH 4-PIN SPI INTERFACE

NexFlash -> Winbond Electronics 

NX25F080A

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 re-write 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

Transfer Sector

to SRAM

Sector

Command Address*

Byte

Address**

SI

54H

S[15:0]

B[15:0]

SO

*The sector address only uses bits [10:0]

**The byte address only uses bits [9:0]

SRAM will be transferred. Although data on SI is ignored,

it is recommended 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-address

(217H), the address counter will roll over to byte-0H.

8 Clocks per Byte Trasnfered

from First Byte to Last Byte

SI=00H During Byte Transfers

8 Clocks

00H

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

Compare Sector

with SRAM Sector

Command Address*

Byte

Address** 16 Clocks

SI

86H

S[15:0]

B[15:0]

0000H

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

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

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

mented and will wrap around to the first address (0H) if it

passes the last address (217H). If any of the compared bits

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

Status Register is set at a 1. This bit will stay set until a

Clear Compare Status command has been issued.

SO

*The sector address only uses bits [10:0]

**The byte address only uses bits [9:0]

RB[15:0]

Read/Busy

Status

First Byte - Last Byte

Bit Compare of Sector

and SRAM

14

NexFlash Technologies, Inc.

PRELIMINARY NXSF005C-0699

06/11/99 ©

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