SH7216 datasheet(21/32 Pages) RENESAS

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SH7216 Group

USB Function Module: USB Mass Storage Class

REJ06B0897-0100/Rev.1.00

July 2009

Page 21 of 32

Command Name

Transport

Name

Operation Content

CBW

This decodes the command and recognizes it as the WRITE

(10) command. It then prepares to receive the data of the

specified sector volume from the specified write sector in the

Disk device open on the SDRAM.

If media access is disabled (LSB of unit_state[0] is 1), the

function treats this as no data transfer and follows (9) in

section 5.7, Processing If an Error Occurs. It also sets a value

to be returned in REQUEST SENSE for NOT READY (not

prepared).

Data

This receives the write sector data from the host PC using

bulk-out transport.

If media access is disabled, it reads and discards data from

the host.

WRITE (10)

CSW

This notifies the host PC that the operation has been

completed successfully.

If media access is disabled, it returns a command fail (CSW

status H'01).

CBW

This decodes the command and recognizes it as the

REQUEST SENSE command. It then prepares to send the

returned value (the results of executing the previous SCSI

command).

Data

This sends the returned value to the host PC using bulk-in

transport.

REQUEST SENSE

CSW

This sends the results of the command execution to the host

PC. The transmission is completed successfully as long as

the data consists of 18 bytes or less.

CBW

This decodes the command and recognizes it as the

PREVENT ALLOW MEDIUM REMOVAL command. It then

prepares to notify the host PC that the operation has been

successfully completed.

If media access is disabled (LSB of unit_state[0] is 1), it sets

the command to "fail" and also sets a value to be returned in

REQUEST SENSE for NOT READY (not prepared).

Data

Data transport does not exist for this command.

PREVENT ALLOW

MEDIUM REMOVAL

CSW

This notifies the host PC that the operation has been

completed successfully.

If media access is disabled, it returns a command fail (CSW

status H'01).

CBW

This decodes the command and recognizes it as the TEST

UNIT READY command. It then prepares to notify the host

PC that the operation has been successfully completed.

If media access is disabled (LSB of unit_state[0] is 1), it sets

the command to "fail" and also sets a value to be returned in

REQUEST SENSE for NOT READY (not prepared).

Data

Data transport does not exist for this command.

TEST UNIT READY

CSW

This notifies the host PC that the operation has been

completed successfully.

If media access is disabled, it returns a command fail (CSW

status H'01).

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