AT83SND2CMP3 datasheet(53/97 Pages) ATMEL

53 / 97 page

AT83SND2CMP3

7524B–MP3–05/06

Figure 38.

(Multiple) Block Read Operation

As shown in Figure 39 and Figure 40 the data write operation uses a simple busy signal-

ling of the write operation duration on the data line (MDAT).

Figure 39.

Sequential Write Operation

Figure 40.

Multiple Block Write Operation

Figure 41.

No Response and No Data Operation

Command Token Format

As shown in Figure 42, commands have a fixed code length of 48 bits. Each command

token is preceded by a Start bit: a low level on MCMD line and succeeded by an End bit:

a high level on MCMD line. The command content is preceded by a Transmission bit: a

high level on MCMD line for a command token (host to card) and succeeded by a 7 - bit

CRC so that transmission errors can be detected and the operation may be repeated.

Command content contains the command index and address information or parameters.

Figure 42.

Command Token Format

Data Block

MCMD

MDAT

Data Stop Operation

Block Read Operation

CRC

Multiple Block Read Operation

Command

Response

Command

Response

Data Block CRC Data Block CRC

Stop Command

Data Stream

MCMD

MDAT

Data Stop Operation

Data Transfer Operation

Command

Response

Command

Response

Stop Command

Busy

MCMD

MDAT

Data Stop Operation

Block Write Operation

Multiple Block Write Operation

Busy

Data Block CRC

Command

Response

Command

Response

Stop Command

Status

Busy

Status

Command

MCMD

MDAT

No Data Operation

No Response Operation

Command

Response

Total Length = 48 bits

Content

CRC

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