preprogrammed. Therefore the user does not need to define the table with line type/breakpoint settings, nor does
the field and frame size need to be programmed. However, when in preset mode, the horizontal parameters (all
dtg1_spec_x registers for the line types used by the preset setting, and dtg1_total_pixels registers) still need to be
programmed. Presets are available for most popular DTV video formats. Alternatively, generic modes for SDTV,
HDTV or VESA can be selected, which allow full programmability of the field/frame sizes and DTG parameters.
Note from the table that:
•
If embedded timing is used, the device is always in slave mode, because the data stream supplied to
THS8200 contains the video timing information.
•
•
Master operation is only supported for PC graphics (VESA) formats.
In HDTV modes with embedded timing, data is supplied to the device over a 20-bit interface, as defined in
SMPTE274/296M.
•
In SDTV modes with embedded timing, data is supplied to the device over a 10-bit interface. When thevideo
format is interlaced, this interface is known as ITU-R.BT656 (525I, 625I). When the video format is
progressive, only 525P is supported with embedded timing. The 625P interface can be supported with
dedicated timing, using the SDTV generic mode.
•
•
In generic modes with dedicated timing, both 20 bits (4:2:2) and 30 bits (4:4:4) are supported.
In PC graphics modes (VESA generic), input data is either over the 30-bit interface or over the 16-/15-bit
interfaceandalwayshasdedicatedtiming. Notethatthe16-bitinterfaceisnotequivalenttoa2×8-bitversion
of the 20-bit interface; see Section 4.2, Input Interface Formats, for details.
4.2 Input Interface Formats
The following figures define the input video format for each input mode, as selected by the data_dman_cntl register
setting. Video data is always clocked in at the rising edge of CLKIN. Note: for 8-bit operation with 10-bit input buses,
connect only the 8 MSBs of each input bus used, and tie the 2 LSBs to ground.
•
30-bit YCbCr/RGB 4:4:4
CLKIN
GY[9:0]/[9:2]
BCb[9:0]/[9:2]
RCr[9:0]/[9:2]
G0/Y0 G1/Y1 G2/Y2 G3/Y3 G4/Y4 G5/Y5 G6/Y6 G7/Y7
B0/Cb0 B1/Cb1 B2/Cb2 B3/Cb3 B4/Cb4 B5/Cb5 B6/Cb6 B7/Cb7
R0/Cr0 R1/Cr1 R2/Cr2 R3/Cr3 R4/Cr4 R5/Cr5 R6/Cr6 R7/Cr7
Figure 4–1. 24-/30-Bit RGB or YCbCr Data Format
•
20-bit YCbCr 4:2:2
CLKIN is equal to the 1× pixel clock. The pixel clock equals the rate of the Y input and is 2× the rate of the 2 other
channels in this input format where Cb and Cr are multiplexed onto the same input bus.
4–2
TI [ TEXAS INSTRUMENTS ]
