Mmc Spi Configuration Register (Mmc_Spi) - Texas Instruments OMAP5910 Technical Reference Manual

MMC/SD Host Controller
Table 7–110. MMC SPI Configuration Register (MMC_SPI)
Bit Name
15 Start
14 WnR
13 –12 Reserved
11 –10 TCSH
9 –8 TCSS
7 –6 Reserved
5 –4 CS
3 CSM
2 CSD
1 PHA
0 POL
Start SPI Transfer (Start)
7-150
This register is used to configure the SPI interface and start an SPI transfer
if SPI mode has been enabled.
Description
Start SPI transfer
Write/not read
Chip-select hold time control
Chip-select setup time control
Chip-select control
Chip-select mode
Chip-select disable
Phase control
Polarity control
This set-only bit (15) always reads as 0. A write to 0 has no effect.
When set to 1 by the local host, a SPI transfer is automatically started.
Note:
The user must take care to initialize MMC_BLEN:BLEN before starting an
SPI transfer.
SPI transfer automatically stops when the size programmed in
MMC_BLEN:BLEN decrements down to 0 (in read and in write).
-
0: No action
-
1: SPI transfer started
Value after reset is low.