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ICS2008BVLFT Datasheet(PDF) 7 Page - Integrated Device Technology |
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ICS2008BVLFT Datasheet(HTML) 7 Page - Integrated Device Technology |
7 / 22 page 7 ICS2008B ICS2008B VITC Read 1 Registers IR10-IR17 (read-only) These read only registers contain the VITC data as received from the video line selected in IR30. The frame is stored with VITC bit 2 in the LSB of IR10 and VITC bit 80 in the MSB of IR17. Note that a binary 10 sync pattern precedes every eight data bits of the VITC frame. The 10 sync pattern is not stored. The CRC is checked by the VITC receiver, and the result is reported in IR30. VITC Read 2 Registers IR18-IR1F (read-only) As with the VITC Read 1 registers, these read only registers contain the VITC data as received from the video line selected in IR31. The frame is stored with VITC bit 2 in the LSB of IR18 and VITC bit 80 in the MSB of IR1F. The result of the CRC check is reported in IR31. VITC Write Registers IR20-IR27 These registers contain the data to be output by the VITC generator. The VITC frame is output with the LSB of IR20 in VITC bit 2 and the MSB of IR27 in VITC bit 80. Note that the binary 10 sync pattern which precedes every eight data bits of the VITC frame is automatically generated by the VITC generator. The CRC is also automatically generated by the VITC generator. BI Window Registers IR28 & 29 The next two registers control the position of the SMPTE video display, burn-in, window within the video raster. IR28 selects the video column (horizontal position) in which the burn-in window starts. IR29 selects the video line which starts the SMPTE video display window in the video output. When this register is set to zero, there will be no Burn-In Window displayed in the video output. BI Character Registers IR2A-IR2D These registers contain the character codes used for the SMPTE time code in the burn-in window which overlays the source in the video output. An internal character generator converts the BCD nibbles to display characters. ITC Write Line Select Registers IR2E & IR2F VITC code is normally output on two separate video lines in each field for redundancy. These two registers allow the indi- vidual line selection & output enables for the two VITC lines. Write Line – Selects the video line on which the VITC code will be output. The video line on which the code is output will be the number in this register plus 10; e.g. writing a one to this register will cause the code to be output on line 11. VITC Write Enable – Enables the output of VITC code on the specified line. Burn-in Window Column Column IR28 Burn-in Window Line Line (00 - disable) IR29 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 VITC Write Line 1 Write Line #10-40 (N+10) Reserved VITC Write Enable (1-enable) IR2E 7 6 5 4 3 2 1 0 VITC Write Line 2 Write Line #10-40 (N+10) Reserved VITC Write Enable (1-enable) IR2F Burn-in Window Registers IR2A – (Frame) IR2B – (Seconds) IR2C – (Minutes) IR2D – (Hours) 7 6 5 4 3 2 1 0 Tens Ones E D O CR E T C A R A H CE D O CR E T C A R A H C 00 8 8 11 9 9 22 A e s U t o N o D 33 B ? 44 C _ 55 D 66 E 77 F k n a l B |
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