Texas Instruments TMS320C6A816 Series Technical Reference Manual page 972

Registers
Table 9-18. Configuration Register (SD_CON) Field Descriptions (continued)
Bit Field
1 INIT
0 Reserved
972
Secure Digital (SD)/—Secure Digital I/O (SDIO) Card Interface
Preliminary
Value Description
Send initialization stream (all cards). When this bit is set to 1, and the card is idle, an
initialization sequence is sent to the card. An initialization sequence consists of setting the
SD_CMD line to 1 during 80 clock cycles. The initialization sequence is mandatory - but it is
not required to do it through this bit - this bit makes it easier. Clock divider (SD_SYSCTL[15:6]
CLKD bits) should be set to ensure that 80 clock periods are greater than 1ms.
Notein this mode, there is no command sent to the card and no response is expected. A
command complete interrupt will be generated once the initialization sequence is completed.
SD_STAT[0] CC bit can be polled.
0 The host does not send an initialization sequence
1 The host sends an initialization sequence
0 Reserved bit field. Do not write any value.
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SPRUGX9 – 15 April 2011
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