SanDisk SD032 Manual descarregar pdf (Página 97)

5.2.3. Responses

There are several types of response tokens. As in the miniSD mode, all are transmitted MSB first.

5.2.3.1. Format R1

This response token is sent by the card after every command with the exception of SEND_STATUS commands. It

is 1 byte long, the MSB is always set to zero and the other bits are error indications. A “1” signals error.

• In idle state—The card is in idle state and running initializing process.

• Erase reset—An erase sequence was cleared before executing because an out of erase sequence

command was received.

• Illegal command—An illegal command code was detected.

• Communication CRC error—The CRC check of the last command failed.

• Erase sequence error—An error in the sequence of erase commands occurred.

• Address error—A misaligned address, which did not match the block length was used in the

command.

• Parameter error—The command’s argument (e.g., address, block length) was out of the allowed range

for this card.

The structure of the R1 format is shown in Figure 5-7.

In Idle State

Erase Reset

Illegal Command

Com CRC Error

Erase_Seq_Error

Address Error

Parameter Error

Figure 5-7. R1 Response Format

5.2.3.2. Format R1b

This response token is identical to R1 format with the optional addition of the busy signal. The busy signal token

can be any number of bytes. A zero value indicates card is busy. A non-zero value indicates card is ready for the

next command.

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 113 114

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SanDisk SD032 Manual Página 97