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Display Subsystem Basic Programming Model
long packets received on the video port and on the L4 interconnect port since the
DSS.
register is used by the video mode. The register can be
unprogrammed by users to send long packets received on the L4 interconnect port only when software
users know that there is no expected data on the video port. The software should correctly program the
register to send sequentially long packets in video and command modes.
The DSS.
register is used to provide payload data for long packets
(Check-sum is calculated by hardware when DSS.
[7] CS_TX_EN is set to 1 otherwise the
value 0x00 is used). The register is not used in video mode since payload data are provided by the video
port. The software should ensure that the following sequence for write accesses to the header and
payload registers (DSS.
and
, respectively) is followed:
•
A long packet header value with WC=0 written in DSS.
register
can be followed by any access.
•
A long packet header value with WC>0 written in DSS.
register
should be followed by one or more writes to the DSS.
register
defined by the WC value before writing again to the same DSS.
register.
CAUTION
If this sequence is not followed, no error is generated. The access to other DSI
registers during this sequence is allowed.
7.5.4.7
DSI Complex I/O
Prior to send/receive any data from the complex I/O, the DSI complex I/O timings should be set according
to the display module timings. The DSI complex I/O pads must also be configured first. See
DSI Complex I/O Basic Programming Model.
7.5.4.8
Video Mode
The DSS.
, DSS.
, DSS.
,
, DSS.
, and DSS.
registers define the
timings of the video mode.
The DSS.
[20] BLANKING_MODE bit defines if the long blanking packets or LPS state are used
during the blanking periods (except HFP, HBP, HSA defined by other bits) when there is no pending data
in TX FIFO ready to be sent. The software should ensure that there is no data in the TX FIFO, no BTA, no
RESET trigger sent, and the DSS.
[9] MODE_SPEED bit is set to 1 (High-Speed mode) to
keep the video mode transfer is HS mode during blanking periods (except for the last blanking period
since it is required to go LPS at least once per frame).
The DSS.
[22] HBP_BLANKING_MODE and
[23] HSA_BLANKING_MODE define if these blanking can send packets from the TX FIFO
or should be kept in HS mode using only long blanking packets.
To ensure that the writes to the register DSS.
are correctly handled
as header information for video mode long packets, the following registers should be programmed:
•
DSS.
[0] VC_EN bit set to 1
•
DSS.
[4] MODE bit set to 1
•
DSS.
register access
•
DSS.
[0] VC_EN bit set to 1
NOTE:
The DSS.
[9] MODE_SPEED bits
are ignored by hardware when the video mode is selected (DSS.
[4] MODE
bit set to 1)
The interrupt events SYNC_LOST_IRQ and RESYNCHRONIZATION_IRQ indicates if the DSI protocol
1741
SWPU177N – December 2009 – Revised November 2010
Display Subsystem
Copyright © 2009–2010, Texas Instruments Incorporated
Содержание OMAP36 Series
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