32

Data Sheet

ATA-Disk Chip

SST58SD008 / 016 / 024 / 032 / 048 / 064 / 096 / 128 / 192

SST58LD008 / 016 / 024 / 032 / 048 / 064 / 096 / 128 / 192

©2001 Silicon Storage Technology, Inc.

S71167-05-000

9/01

391

3.2.1.21 Write Long Sector - 32H or 33H

This command is similar to the Write Sector(s) command except that it writes 516 Bytes instead of 512

Bytes. Only single sector Write Long operations are supported. The transfer consists of 512 Bytes of

data transferred in Word-Mode followed by 4 Bytes of ECC transferred in Byte-Mode. Because of the

unique nature of the solid-state ADC, the 4 Bytes of ECC transferred by the host may be used by the

ADC. The ADC may discard these 4 Bytes and write the sector with valid ECC data. This command has

the same protocol as the Write Sector(s) command. Use of this command is not recommended.

3.2.1.22 Write Multiple Command - C5H

Note: The current revision of the SST ADC can support up to a block count of 1 as indicated in the Identify Drive Command information.

This command is similar to the Write Sectors command. The ADC sets BSY within 400 ns of accepting

the command. Interrupts are not presented on each sector but on the transfer of a block which contains

the number of sectors defined by Set Multiple. Command execution is identical to the Write Sectors

operation except that the number of sectors defined by the Set Multiple command is transferred without

intervening interrupts.

DRQ qualification of the transfer is required only at the start of the data block, not on each sector. The

block count of sectors to be transferred without intervening interrupts is programmed by the Set Multiple

Mode command, which must be executed prior to the Write Multiple command.

When the Write Multiple command is issued, the Sector Count Register contains the number of sectors

(not the number of blocks or the block count) requested. If the number of requested sectors is not

evenly divisible by the sector/block, as many full blocks as possible are transferred, followed by a final,

partial block transfer. The partial block transfer is for n sectors, where:

n = remainder (sector count/block).

If the Write Multiple command is attempted before the Set Multiple Mode command has been executed

or when Write Multiple commands are disabled, the Write Multiple operation will be rejected with an

aborted command error.

Bit ->

76

54

32

10

Command (7)

32H or 33H

C/D/H (6)

1

LBA

1

Drive

Head (LBA 27-24)

Cyl High (5)

Cylinder High (LBA 23-16)

Cyl Low (4)

Cylinder Low (LBA 15-8)

Sec Num (3)

Sector Number (LBA 7-0)

Sec Cnt (2)

X

Feature (1)

X

Bit ->

76

54

32

10

Command (7)

C5H

C/D/H (6)

X

LBA

X

Drive

Head

Cyl High (5)

Cylinder High

Cyl Low (4)

Cylinder Low

Sec Num (3)

Sector Number

Sec Cnt (2)

Sector Count

Feature (1)

X