SH7216 datasheet(22/32 Pages) RENESAS

22 / 32 page

SH7216 Group

USB Function Module: USB Mass Storage Class

REJ06B0897-0100/Rev.1.00

July 2009

Page 22 of 32

Command Name

Transport

Name

Operation Content

CBW

This decodes the command and recognizes it as the VERIFY

(10) 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.

VERIFY (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 a command and recognizes it as a

STOP/START UNIT command. It then sets the LSB of global

variable unit_state[0] to 1 when the command specifies media

ejection or stop, or clears the LSB of global variable

unit_state[0] to 0 in other cases.

When the user wants recovery from the inaccessible state,

clear the LSB of unit_state[0] to 0.

Data

Data transport does not exist for this command.

STOP/START UNIT

CSW

This notifies the host PC that the operation has been

completed successfully.

CBW

This decodes a command and recognizes it as a MODE

SENSE (6) command. It then prepares to send the requested

MODE SENSE information.

Data

This sends the MODE SENSE information to the host PC

using bulk-in transport.

MODE SENSE (6)

CSW

This sends the results of the command execution to the host

PC.

CBW

This decodes a command and recognizes it as a READ

FORMAT CAPACITY command. Regarding that the disk on

the SDRAM has been formatted, it then prepares to send the

20-byte READ FORMAT CAPACITY information (consisting

of byte count per sector and total sector count of the disk). If

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

function treats this as no data transfer and follows (4) 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 sends the READ FORMAT CAPACITY information to the

host PC using bulk-in transport.

If media access is disabled, it returns data as much as data

requested by the host (H'00).

READ FORMAT

CAPACITY

CSW

This sends the results of the command execution to the host

PC. If media access is disabled, it returns a command fail

(CSW status H'01).

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