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SMSXXXAF Datasheet(PDF) 24 Page - Numonyx B.V |
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SMSXXXAF Datasheet(HTML) 24 Page - Numonyx B.V |
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24 / 61 page  Secure digital memory card interface SMSxxxAF, SMSxxxFF, SMSxxxBF 24/61 Table 11. SD Card Command Format 3.6 Responses All responses are sent via the command line CMD. Response transmission always starts with the leftmost bit of the response codeword. The code length depends on the response type. A response always starts with a start bit (always '0'), followed by the bit indicating the direction of transmission (from card = '0'). A value denoted by 'X' in Table 12, Table 13, Table 14 and Table 15 indicates a variable entry. All responses (except for R3 Responses) are protected by a CRC. All response codewords are terminated by the end bit (always '1'). There are five types of responses. Their formats are defined as follows: 1. R1 (normal response command): the code length is 48 bits. Bits 45 to 40 indicate the index of the command to respond to. The index is a binary coded number (between 0 and 63). The status of the card is coded in 32 bits (see Table 12). Note that if data transfer to the card takes place, then a busy signal may appear on the data line after the transmission of each block of data. The host has to check for busy after data block transmission. 2. R1b is identical to R1 with an optional busy signal transmitted on the data line. The card may become busy after receiving these commands, depending on the state it was in prior to receiving the command. The Host has to check for busy in the response. 3. R2 (CID, CSD Register): the code length is 136 bits. The contents of the CID Register are sent as a response to the CMD2 and CMD10 commands. The contents of the CSD Register are sent as a response to CMD9. Only the bits [127...1] of the CID and CSD Registers are transferred, the reserved bit [0] of these registers is replaced by the end bit of the response (see Table 13). 4. R3 (OCR register): the code length is 48 bits. The contents of the OCR register are sent as a response to ACMD41 (see Section Table 14. on page 25). 5. R6 (Published RCA response): the code length is 48 bits. Bits 45 to 40 indicate the index of the command to respond to. In this case it is '000011' (together with bit 5 in the status bits it means = CMD3) as shown in Table 15 The 16 MSB bits of the argument field are used for the Published RCA number. For more details about Response formats, please refer to the SD Memory Card Specification. Bit position 47 46 45:40 39:8 7:1 0 Width 116 32 71 Value '0 ''1 'x x x '1' Description Start bit Transmission bit Command index Argument CRC7 End bit |
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