SRS04

         
            The SRS04 - SRS07 registers store the response returned by the card.\n
            The mapping of the actual device response and the SRS04 - SRS07 contents depends on the type of response.
            The type of response is determined by the RTS field (Response Type) for all user-defined commands.\n
            The separate cases are the Auto-CMD12 response (called R1b in the SD Memory Specification) and Auto-CMD23 response (called R1 in the SD Memory Specification).
            Auto-CMD12 and Auto-CMD23 responses are handled by the core automatically and goes to the SRS07 register regardless of the RTS value.\n

            SRS04-SRS07 relation to received response field:
            [list]
            [*] Auto-CMD12 resp: Response field R[39:8] - RESP3[31:0]\n
            [*] Auto-CMD23 resp: Response field R[39:8] - RESP3[31:0]\n
            [*] No response: RTS=00b
            [*] 136-bit: RTS=01b, Response field R[127:8] - {RESP3[23:0], RESP2[31:0], RESP1[31:0], RESP0[31:0]}\n
            [*] 48-bit: RTS=10b, Response field R[39:8] - RESP0[31:0]\n
            [*] 48-bit with BUSY: RTS=11b, Response field R[39:8] - RESP0[31:0]\n
            [/list]

            Implementation note: Registers value are undefined after reset, and will be valid after response is received.