AT83SND1CXXX-ROTIL datasheet(111/212 Pages) ATMEL

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4109J–8051–10/06

AT8xC51SND1C

15.2.3

Command Token Format

As shown in Figure 15-6, 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 15-6. Command Token Format

Table 95. Command Token Format

15.2.4

Response Token Format

There are five types of response tokens (R1 to R5). As shown in Figure 15-7, responses have a

code length of 48 bits or 136 bits. A response 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 low level on MCMD line for a response token (card to host)

and succeeded (R1,R2,R4,R5) or not (R3) by a 7 - bit CRC.

Response content contains mirrored command and status information (R1 response), CID regis-

ter or CSD register (R2 response), OCR register (R3 response), or RCA register (R4 and R5

response).

Figure 15-7. Response Token Format

Total Length = 48 bits

Content

CRC

Bit Position

45:40

39:8

7:1

Width (Bits)

116

Value

‘0’

‘1’

Description

Start bit

Transmission

bit

Command

Index

Argument

CRC7

End bit

Total Length = 48 bits

Content

CRC

R1, R4, R5

Total Length = 136 bits

Content = CID or CSD

CRC

Total Length = 48 bits

Content

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