Normal/Inverted Clock; Normal/Inverted Frame Synchronization; Channel Used; Word Size - Texas Instruments OMAP5912 Reference Manual

Multichannel Serial Interfaces

Normal/Inverted Clock

Normal/Inverted Frame Synchronization

Channel Used

Word Size

Frame Size

116 Serial Interfaces
The polarity of the clock can be either normal, with writing on the positive edge
clock and reading on the negative edge clock , or inverted, with writing on the
negative edge clock and reading on the positive edge clock.
Control bit:
MAIN_ PARAMETERS _REG(4) = CLOCK_POLARITY
1: Inverted
0: Normal
The polarity of the frame-synchronization pulse can be either normal, with a
positive pulse, or inverted, with a negative pulse.
Control bit:
MAIN_ PARAMETERS _REG(10) = FRAME_POLARITY
1: Inverted
0: Normal
To enable a channel in multimode, set bit n for the desired channel n.
To choose the size of the word, set its size minus one into the main parameters
registers.
Control bit:
MAIN_PARAMETERS_REG(3:0) = WORD_ SIZE
(2 <= WORD_ SIZE <= 15)
The MCSI transmits and receives the most significant bit first. For example,
if the word_size equals 11, the upper 12 bits of the TX registers are transmitted,
the upper 12 bits of the RX registers contain the received data, and the lower
4 bits are zeros.
To add any overhead bits at the end of each frame, set the number of desired
overhead bits in the over_size_register.
Control bit:
OVER_CLOCK_REG(9:0) = OVER_CLK (0<=OVER_CLK <=1023)
SPRU760B