DP/DN
TXCLKESC
DIRECTION
LP state driven by remote LPTX
LP state driven by DSI PHY LPTX
DSI PHY LPRX detects turnaround request pattern
(11 - 10 - 00 - 10 - 00)
2*T
<= T
<= 3*T
LPX
TA-SURE
LPX
T
= 5*T
TA-GET
LPX
LP-11
LP-10
LP-00
LP-10
LP-00
LP-00
LP-00 LP-00 LP-00
LP-11
LP-10
LP-00
LP-00
dss-402
Public Version
www.ti.com
Display Subsystem Basic Programming Model
Figure 7-143. Turn-Around Request in Receive Mode
If the line stays in LP-00 for a time T
TA-SURE
, DSI PHY accepts the turn-around request, changes the
direction, transmits LP-00 for a time T
TA-GET
, and then transmits the acknowledgment pattern LP-10,
followed by the STOP state.
This completes the turn-around procedure. The T
TA-SURE
and T
TA-GET
timing parameters are programmable
through DSS.
in number of TxClkEsc clocks:
•
T
TA-SURE
can be configured in the [28:27] REG_TTASURE bit field.
•
T
TA-GET
can be configured in the [26:24] REG_TTAGET bit field.
7.5.6.4.5 Other DSI_PHY Transmission and Reception
The timing of the following sequences defined in the DSI_PHY protocol cannot be programed by users:
•
Low-power data transmission
•
Escape mode trigger command transmission
•
ULP state command transmission on data lanes
•
ULP state transmission on clock lane
•
Low-power data in receive mode
•
Low-power trigger in receive mode
•
ULP state command on clock lane in receive mode
•
ULP state command on data lane in receive mode
7.5.6.5
Error Handling
A dedicated register for the DSI complex I/O, DSS.
, indicates the state
of each error provided by the DSI complex I/O error signals. The DSI_PHY reports the following errors:
•
[7:5] ERR_ESCi_IRQ: ERRESC is asserted if an
unrecognized Escape entry command is received. This remains high until the next change in the
line state.
•
[2:0] ERRSYNCESCi_IRQ: If the number of bits received
during a low-power data transmission is not a multiple of eight when the transmission ends,
ERRSYNCESC is made high and remains high until the next change in line state.
•
[12:10] ERRCONTROLi_IRQ: ERRCONTROL is asserted if
an incorrect line state sequence is detected. For example, if a turn-around request or escape mode
request is immediately followed by a Stop state instead of the required Bridge state, this signal is
asserted and remains asserted until the next change in the line state.
1763
SWPU177N – December 2009 – Revised November 2010
Display Subsystem
Copyright © 2009–2010, Texas Instruments Incorporated