SN65DSI86-Q1 Datasheet, PDF (37/81 Pages) Texas Instruments – MIPI DSI to eDP Bridge

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SN65DSI86-Q1
SLLSEJ5A – JULY 2014 – REVISED DECEMBER 2015
8.4.5.9 Panel Self Refresh (PSR)
The panel self refresh (PSR) feature enables system-level power savings when the displayed image remains
static for multiple display frames. The eDP display (sink) stores a static image locally in a remote frame buffer
(RFB) within the sink and displays this image from the RFB while the eDP Main link may be turned off
(SUSPEND asserted). The DSIx6 may turn off other features in addition to the main link for further power
savings. The system software makes the determination on what power savings must be implemented (like
shutdown of DP link (SUSPEND asserted), shutdown of entire SN65DSIx6 (EN deasserted), and so on). When
implementing PSR, any power savings must not impact system responsiveness to user input that affects the
display, such as cursor movement.
In the list below are the requirements the GPU and system designer must meet when implementing PSR:
1. Updates to the remote frame buffer located in sink must include two of the same static frame. The reason for
this requirement is the DSIx6 will never pass the first frame received on the DSI interface to the DisplayPort
interface. All subsequent frames will be passed to the DisplayPort interface.
2. If PWM signal is controlled directly by the DSIx6 and SUSPEND asserted, the REFCLK must remain active.
8.4.5.10 Secondary Data Packet (SDP)
All secondary data packets (SDP) are provided to the DSIx6 through the DSI interface during vertical blanking
periods. (SDP are not supported using the I²C interface.) The DSIx6 will wrap the SDP provided to the DSI
interface with the SS and SE control symbols and then transmit over the DP interface during the vertical blanking
period. Secondary data packets are used to pass non-active video data to the eDP sink. Information like stereo
video attributes and/or PSR-state data is sent using SDP. When SDP is used for stereo video attributes, software
must program the MSA_MISC1_2_1 register with a zero.
The DSIx6 requires that the SDP be provided to the DSI interface in the following order:
1. 4 Bytes of Header (HB0 through HB3)
2. 4 Bytes of Header parity (PB0 through PB3)
3. 8 Bytes of Data (DB0 through DB7)
4. 2 Bytes of Data parity (PB4 and PB5)
5. 8 Bytes of Data (DB8 through DB15)
6. 2 Bytes of Data parity (PB6 and PB7)
For data payloads greater than 16 bytes, data must be provided in multiples of 8 bytes with of 2 bytes of parity. If
the final multiple is less than 8, zero padding must be used to fill the remaining data positions.
8.4.5.11 Color Bar Generator
The DSIx6 implements a SMPTE color bar. The color bar generator does not require the DSI interface. All color
bars will be transmitted at a 60-Hz frame rate. The active video size of the Color bar is determined by the values
programmed into the Video Registers.
The color bar generator supports the following color bars for both horizontal and vertical direction:
1. 8 color {White, Yellow, Cyan, Green, Magenta, Red, Blue, Black}
2. 8 gray scale {White, Light Gray, Gray, Light Slate Gray, Slate Gray, Dim Gray, Dark Slate Gray, Black}
3. 3 color {Red, Green, Blue}
4. Stripes {White, Black}. Every other pixel (pixel1 = white, pixel2 = black, pixel3 = white, and so on).
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