©2011 Silicon Storage Technology, Inc.

S71296-05-000

02/11

13

8 Mbit SPI Serial Flash

SST25VF080B

Data Sheet

A Microchip Technology Company

Auto Address Increment (AAI) Word-Program

The AAI program instruction allows multiple bytes of data to be programmed without re-issuing the

next sequential address location. This feature decreases total programming time when multiple bytes

or entire memory array is to be programmed. An AAI Word program instruction pointing to a protected

memory area will be ignored. The selected address range must be in the erased state (FFH) when ini-

tiating an AAI Word Program operation. While within AAI Word Programming sequence, only the fol-

lowing instructions are valid: for software end-of-write detection—AAI Word (ADH), WRDI (04H), and

RDSR (05H); for hardware end-of-write detection—AAI Word (ADH) and WRDI (04H). There are three

options to determine the completion of each AAI Word program cycle: hardware detection by reading

Refer to“End-of-Write Detection” for details.

Prior to any write operation, the Write-Enable (WREN) instruction must be executed. Initiate the AAI

lowing the addresses, two bytes of data are input sequentially, each one from MSB (Bit 7) to LSB (Bit

before executing the AAI Word Program instruction. Check the BUSY status before entering the next

valid command. Once the device indicates it is no longer busy, data for the next two sequential

addresses may be programmed, followed by the next two, and so on.

When programming the last desired word, or the highest unprotected memory address, check the busy

status using either the hardware or software (RDSR instruction) method to check for program comple-

tion. Once programming is complete, use the applicable method to terminate AAI. If the device is in

Software End-of-Write Detection mode, execute the Write-Disable (WRDI) instruction, 04H. If the

device is in AAI Hardware End-of-Write Detection mode, execute the Write-Disable (WRDI) instruction,

04H, followed by the 8-bit DBSY command, 80H. There is no wrap mode during AAI programming

once the highest unprotected memory address is reached. See Figures 10 and 11 for the AAI Word

programming sequence.

End-of-Write Detection

There are three methods to determine completion of a program cycle during AAI Word programming:

hardware detection by reading the Serial Output, software detection by polling the BUSY bit in the Soft-

section below.

Hardware End-of-Write Detection

The Hardware End-of-Write detection method eliminates the overhead of polling the Busy bit in the

Software Status Register during an AAI Word program operation. The 8-bit command, 70H, configures

the Serial Output (SO) pin to indicate Flash Busy status during AAI Word programming. (see Figure 8)

The 8-bit command, 70H, must be executed prior to initiating an AAI Word-Program instruction. Once

an internal programming operation begins, asserting CE# will immediately drive the status of the inter-

nal flash status on the SO pin. A ‘0’ indicates the device is busy and a ‘1’ indicates the device is ready

for the next instruction. De-asserting CE# will return the SO pin to tri-state. While in AAI and Hardware

End-of-Write detection mode, the only valid instructions are AAI Word (ADH) and WRDI (04H).

To exit AAI Hardware End-of-Write detection, first execute WRDI instruction, 04H, to reset the Write-

Enable-Latch bit (WEL=0) and AAI bit. Then execute the 8-bit DBSY command, 80H, to disable RY/

BY# status during the AAI command. See Figures 9 and 10.