SanDisk SDSDH-1024 Product Manual - Page 102

Revision 2.2 Chapter 5 - SPI Protocol SD Card Product Manual CMD SPI Index Mode Argument Resp Abbreviation Description CMD56 Yes [31:0] stuff bits, [0]: RD/WR4 R1 GEN_CMD Used either to transfer a Data Block to the card or to get a Data Block from the card for general purpose/application specific commands. The size of the Data Block is defined with SET_BLOCK_LEN command. CMD57 Reserved for each command system set by switch function command (CMD6). Detailed definition can be referenced in each command system specification. CMD58 Yes None R3 READ_OCR Reads the OCR Register of a card. CMD59 Yes [31:1] stuff bits, [0:0] CRC option R1 CRC_ON_OFF Turns the CRC option on or off. A '1' in the CRC option bit will turn the option on, a '0' will turn it off. CMD60- Reserved for manufacturer. CMD63 5.18 Responses There are several types of response tokens. As in the SD mode, all are transmitted MSB first. 5.18.1 Format R1 The card sends this response token 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; '1' signals error. • 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. 4 RD/WR: 1 = host will get a block of data from the card. 0 = host sends block of data to the card. © 2004 SanDisk Corporation 5-12 12/08/04