BT849AKPF datasheet(8/141 Pages) ETC

Part #	BT849AKPF

Description	Single-Chip Video Capture for PCI

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Brooktree®

viii

L848A_A

Bt848/848A/849A

Single-Chip Video Capture for PCI

LIST OF FIGURES

List Of Figures

Figure 1.

Bt848/848A/849A Detailed Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Figure 2.

Bt848 Video Decoder and Scaler Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 3.

Bt848/848A/849A Pinout Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 4.

UltraLock Behavior for NTSC Square Pixel Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 5.

Y/C Separation and Chroma Demodulation for Composite Video . . . . . . . . . . . . . . . . . . 19

Figure 6.

Y/C Separation Filter Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 7.

Filtering and Scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 8.

Optional Horizontal Luma Low-Pass Filter Responses. . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 9.

Combined Luma Notch, 2x Oversampling

and Optional Low-Pass Filter Response (NTSC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 10. Combined Luma Notch, 2x Oversampling

and Optional Low-Pass Filter Response (PAL/SECAM) . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 11. Frequency Responses for the Four Optional Vertical Luma Low-Pass Filters . . . . . . . . . 23

Figure 12. Combined Luma Notch and 2x Oversampling Filter Response . . . . . . . . . . . . . . . . . . . . 23

Figure 13. Peaking Filters (Bt848A/849A only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 14. Luma Peaking Filters with 2x Oversampling Filter

and Luma Notch (Bt848A/849A only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 15. Effect of the Cropping and Active Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 16. Regions of the Video Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 17. Coring Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 18. Regions of the Video Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 19. VBI Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 20. VBI Section Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 21. Video Data Format Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Figure 22. Data FIFO Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Figure 23. RISC Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Figure 24. Example of Bt848 Performing Complex Clipping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Figure 25. Typical External Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Figure 26. Clock Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Figure 27. Luma and Chroma 2x Oversampling Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Figure 28. PCI Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Figure 29. GPIO Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Figure 30. GPIO SPI Input Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Figure 31. GPIO SPI Output Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Figure 32. Video Timing in SPI Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Figure 33. Basic Timing Relationships for SPI Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Figure 34. CCIR 656 or ByteStream Interface to Digital Input Port . . . . . . . . . . . . . . . . . . . . . . . . . . 73

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