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Timer started
Timer loaded
DSI_TIMING2[31] HS_TX_TO = 0x0
by software
DSI_TIMING2[31] HS_TX_TO = 0x1
RESET
DSI_TIMING2[31] HS_TX_TO = 0x0 by software
DSI link is High Speed mode
SOT generated
Time-out
IDLE
DSI_TIMING2[31] HS_TX_TO = 0x0 by hardware
DSI ends in high speed mode
EOT generated
HS_TX_TO
interrupt
generation and
EOTsent
dss-174
Public Version
Display Subsystem Functional Description
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The maximum time to be supported is 20 ms. It can be used to determine that at least once a frame in
video mode, the HS mode is stopped to enter ULPS. Since the refresh rate can be up to 50 frames per
second in video mode, the maximum time in HS is 20 ms.
The timer is loaded with the value in number of TxByteClkHS:
DSI TIMING2[28:16] HS_TX_TO_COUNTER x ((DSI TIMING2[30] HS_TX_TO_X16 x 15) +1) x ((DSI
TIMING2[29] HS_TX_TO_X8 x 7) +1)
Figure 7-98. High-Speed TX Timer FSM
When the time-out occurs, the hardware should sent EOT request in order for the DSI complex I/O to
drive LP-11 stop state. This is followed by the generation of the interrupt. The hardware will perform an
internal logic reset including the TX FIFO content, but excluding the register values and then resets the
DSS.
[0] IF_EN bit.
The software should wait for the DSS.
[0] IF_EN bit to be reset to 0 before taking any recovery
action by resetting for example the peripheral if it is not responding.
7.4.3.7.6 LP RX Timer
When the host is in Low power Receive mode after a bus turn-around, the LP RX timer is loaded. When
the timer expires, the host requests the DSI complex I/O to drive LP-11. The interrupt LP_RX_TO_IRQ is
generated when the timer expires. The DSS.
[15] LP_RX_TO_IRQ bit is set to 1 when
the LP RX time-out occurs.
The DSS.
[15] LP_RX_TO bit is set/reset by the software to respectively enable/disable the
timer.
The timer is loaded with the value in number of DSI_FCLK cycles:
[12:0] LP_RX_TO_COUNTER x ((
[14] LP_RX_TO_X16 x 15) + 1) x
((
[13] LP_RX_TO_X4 x 3) + 1)
1678
Display Subsystem
SWPU177N – December 2009 – Revised November 2010
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