SST55LD019M datasheet(39/59 Pages) SST

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Advance Information

ATA Flash Disk Controller

SST55LD019M

S71312-01-000

12/06

Features 01H and 81H are used to enable and clear 8-bit data transfer mode. If the 01H feature

command is issued all data transfers will occur on the low order D7-D0 data bus and the IOCS16#

signal will not be asserted for data register accesses.

Features 02H and 82H allow the host to enable or disable write cache in the ATA Flash Disk Controllers

that implement write cache. When the subcommand Disable-Write-Cache is issued, the ATA Flash Disk

Controller should initiate the sequence to flush cache to non-volatile memory before command

completion.

Feature 03H allows the host to select the transfer mode by specifying a value in the Sector Count

One PIO mode is selected at all times. The host may change the selected modes by the Set-Features

command.

Features 66H and CCH can be used to enable and disable whether the Power-on Reset (POR) Defaults

will be set when a software reset occurs.

10.2.1.18 Set-Multiple-Mode - C6H

This command enables the ATA Flash Disk Controller to perform Read and Write-Multiple operations

and establishes the block count for these commands. The Sector Count register is loaded with the

number of sectors per block. Upon receipt of the command, the ATA Flash Disk Controller sets BSY to 1

and checks the Sector Count register.

If the Sector Count register contains a valid value (see Section 10.2.1.5.12 for details) and the block

count is supported, the value is loaded for all subsequent Read-Multiple and Write-Multiple commands

and execution of those commands is enabled. If a block count is not supported, an Aborted Command

error is posted, and Read-Multiple and Write-Multiple commands are disabled. If the Sector Count

power on, or after a hardware or (unless disabled by a Set Feature command) software reset, the

default mode is Read and Write-Multiple disabled.

TABLE10-6:Transfer Mode Values

Mode

Bits [7:3]

Bits [2:0]

PIO default mode

00000b

000b

PIO default mode, disable IORDY

00000b

001b

PIO flow control transfer mode

00001b

mode1

1. Mode = transfer mode number, all other values are not valid

Multi-word DMA mode

00100b

mode1

Reserved

Other

N/A

T10-6.0 1312

Bit ->

76543210

Command (7)

C6H

C/D/H (6)

XDrive

Cyl High (5)

Cyl Low (4)

Sec Num (3)

Sec Cnt (2)

Sector Count

Feature (1)

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