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Data Sheet

ATA-Disk Chip

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S71167-05-000

9/01

391

3.2.1.16 Set Multiple Mode - C6H

This command enables the ADC 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 ADC sets BSY to 1 and checks the Sector Count Register.

If the Sector Count Register contains a valid value 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 Register contains 0 when the command is

issued, Read and Write Multiple commands are disabled. At 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.

3.2.1.17 Set Sleep Mode - 99H or E6H

This command causes the ADC to set BSY, enter the Sleep mode, clear BSY and generate an interrupt.

Recovery from sleep mode is accomplished by simply issuing another command (a reset is permitted

but not required). Sleep mode is also entered when internal timers expire so the host does not need to

issue this command except when it wishes to enter Sleep mode immediately. The default value for the

timer is 15 milliseconds.

Bit ->

Command (7)

C6H

C/D/H (6)

XDrive

Cyl High (5)

Cyl Low (4)

Sec Num (3)

Sec Cnt (2)

Sector Count

Feature (1)

Bit ->

Command (7)

99H or E6H

C/D/H (6)

XDrive

Cyl High (5)

Cyl Low (4)

Sec Num (3)

Sec Cnt (2)

Feature (1)

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