Analog Devices ADV8003, Руководство по оборудованию

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ADV8003 Hardware Manual
Rev. B, August 2013 91
2.2.2.3. TTL Output
The ADV8003 includes a TTL output port, The external OSD TTL input pins (OSD_IN[23:0]) and 12 of the TTL input pins (P35:24) can
function as TTL output pins (refer to Table 98 and Table 99 ). If all 36 TTL pins are used as outputs, this leaves only 24 pins for TTL inputs.
Appendix F describes the different pinout options available for the TTL input and output buses. HS, VS, DE and the TTL clock are output
on the following pins:
•
OSD_IN[23:0]
• P[35:24]
•
OSD_HS
• OSD_VS
• OSD_DE
• OSD_CLK
The video data can be output at pixel frequencies up to 162 MHz. Only single data rate video is supported on the TTL output bus – it is
not possible to clock video out on the rising and falling edge of the TTL output clock.
Figure 33: TTL Output Block Diagram
The following registers are used to control the TTL outputs.
ttl_ps444_in , IO Map, Address 0x1A01[0]
This bit is used to select the video type sent to the TTL output format block.
Function
ttl_ps444_in Description
0  Input to TTL output block is real 444
1 Input to TTL output block is pseudo 444