©2010 Silicon Storage Technology, Inc.

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1.8V Serial Quad I/O (SQI) Flash Memory

SST26WF032

Advance Information

Set Burst

The Set Burst command specifies the number of bytes to be output during a Read Burst command

before the device wraps around. To set the burst length the host drives CE# low, sends the Set Burst

command cycle (C0H) and one data cycle, then drives CE# high. A cycle is two nibbles, or two clocks,

long, most significant nibble first. After power-up or reset, the burst length is set to eight Bytes (00H).

See Table 4 for burst length data and Figure 12 for the sequence.

Figure 12:Set Burst Length Sequence

Read Burst

To execute a Read Burst operation the host drives CE# low, then sends the Read Burst command

cycle (0CH), followed by three address cycles, and then one dummy cycle. Each cycle is two nibbles

(clocks) long, most significant nibble first.

After the dummy cycle, the device outputs data on the falling edge of the SCK signal starting from the

specified address location. The data output stream is continuous through all addresses until termi-

nated by a low-to-high transition on CE#.

During Read Burst, the internal address pointer automatically increments until the last byte of the burst

is reached, then jumps to first byte of the burst. All bursts are aligned to addresses within the burst

length, see Table 5. For example, if the burst length is eight Bytes, and the start address is 06h, the

burst sequence would be: 06h, 07h, 00h, 01h, 02h, 03h, 04h, 05h, 06h, etc. The pattern would repeat

until the command was terminated by a low-to-high transition on CE#.

During this operation, blocks that are Read-locked will output data 00H.

Table 4: Burst Length Data

Burst Length

High Nibble (H0)

Low Nibble (L0)

8 Bytes

0h

0h

16 Bytes

0h

1h

32 Bytes

0h

2h

64 Bytes

0h

3h

T4.0 1409

Table 5: Burst Address Ranges

Burst Length

Burst Address Ranges

8 Bytes

00-07H, 08-0FH, 10-17H, 18-1FH...

16 Bytes

00-0FH, 10-1FH, 20-2FH, 30-3FH...

32 Bytes

00-1FH, 20-3FH, 40-5FH, 60-7FH...

64 Bytes

00-3FH, 40-7FH, 80-BFH, C0-FFH

T5.0 1409

1409 F32.0

MODE 3

0

1

SCK

SIO(3:0)

CE#

C1 C0

MODE 0

23

H0 L0

MSN LSN

Note: MSN = Most Significant Nibble,

LSN = Least Significant Nibble