Texas Instruments OMAP5912 Reference Manual page 1170

Table 46. Setup Register 5 (SR5) (R/W)
Bit Name
3 CS_TOGGLE_TX_EN
2 AUTO_TX_EN
1 IT_EN
0 DMA_TX_EN
Note: Content of this register must not be changed when a read or write process is running.
SPRU760B
Base Address = 0xFFFB 3000, Offset = 0x18
Function
CS_TOGGLE_TX_EN is possible only in
autotransmit mode.
When in autotransmit mode with
CS_TOGGLE_TX_EN inactive, the CS does not go
to its active level automatically. Control the CS with
the CS CMD bit of the control and status register
(CSR) in the software.
CS_toggle transmit mode is disabled if 0.
CS_toggle transmit mode is enabled if 1.
In autotransmit mode, the CS_CMD and START
bits of the control and status register (CSR) are not
used. A hardware state machine detects a TXD
write and automatically sets the programmed CS to
its active value, and then starts the transmission.
The CS CMD and the START bits in the control and
status register (CSR) are not updated during
autotransmit.
Autotransmit mode is disabled if 0.
Autotransmit mode is enabled if 1.
In IT mode, an interrupt is generated each time a
word has been transferred or received. This
interrupt is a low-level interrupt. A status register
(IST) allows the CPU to know which interrupt
(receive and/or transmit) occurred.
IT mode is disabled if 0.
IT mode is enabled if 1.
DMA transmit mode is disabled if 0.
DMA transmit mode is enabled if 1.
Set up the DMA, IT, AUTO_TX, and CS_TOGGLE modes in this register.
In DMA mode, a DMA request is initiated each time a transmission slot is
available.
The maximum word size in DMA mode is 16 bits.
MicroWire Interface
Reset Value
0
0
0
0
Serial Interfaces 105