Specifications
53
AT83SND2CMP3
7524D–MP3–07/07
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 OperationBlock 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 OperationData Transfer Operation
Command ResponseCommand Response
Stop Command
Busy
MCMD
MDAT
Data Stop OperationBlock Write Operation
Multiple Block Write Operation
BusyData Block CRC Data Block CRC
Command Response Command Response
Stop Command
Status BusyStatus
CommandMCMD
MDAT
No Data OperationNo Response Operation
Command Response
0
Total Length = 48 bits
Content CRC1 1