SH7721 datasheet(1095/1524 Pages) RENESAS

1095 / 1524 page

Section 31

MultiMediaCard Interface (MMCIF)

Rev. 3.00 Jan. 18, 2008 Page 1033 of 1458

REJ09B0033-0300

31.3.3

Response Type Register (RSPTYR)

RSPTYR specifies command format in conjunction with CMDTYR. Bits RTY2 to RTY0 are used

to specify the number of response bytes, and bits RTY5 and RTY4 are used to make additional

settings.

Bit

Bit Name

Initial

Value

R/W

Description

7, 6

—

All 0

R/W

Reserved

These bits are always read as 0. The write value should

always be 0.

RTY5

R/W

This bit is set when a command with R1b response is issued.

RTY4

R/W

Makes settings so that the command response (other than

R2 response) CRC is checked by CRC7. Bits RTY2 to RTY0

should be set to 100.

RTY3

R/W

Reserved

RTY2

RTY1

RTY0

R/W

These bits specify the number of command response bytes.

000: A command needs no command response.

001: Setting prohibited

010: Setting prohibited

011: Setting prohibited

100: A command needs a 6-byte command response.

Specified by R1, R1b, R3, R4, and R5 responses.

101: A command needs a 17-byte command response.

Specified by R2 response.

110: Setting prohibited

111: Setting prohibited

Note:

Checking CRC by RTY4 is not checking the command response CRC error bit but checking

the command response CRC. This checking is not performed for the CRC of the R2

command response in MMC mode.

Table 31.2 summarizes the correspondence between the commands described in The

MultiMediaCard System Specification Version 3.1 and the settings of CMDTYR and RSPTYR.

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