Texas-instruments TMS320C64x DSP Manual de usuario descargar pdf (Pagina 23)

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101

Video Port FIFO

Overview1-6 SPRU629

1.2.2 Video Capture FIFO Configurations

During video capture operation, the video port FIFO has one of four configura-

tions depending on the capture mode. For BT.656 operation, the FIFO is split

into channel A and B, as shown in Figure 1–2. Each FIFO is clocked indepen-

dently with the channel A FIFO receiving data from the VDIN[9–0] half of the

bus and the channel B FIFO receiving data from the VDIN[19–10] half of the

bus. Each channel’s FIFO is further split into Y, Cb, and Cr buffers with sepa-

rate write pointers and read registers (YSRCx, CBSRCx, and CRSRCx).

Figure 1–2. BT.656 Video Capture FIFO Configuration

VDIN[9–0]

VDIN[19–10]

Capture FIFO A

Y Buffer A (1280 bytes)

Cb Buffer A (640 bytes)

8/10

Cb Buffer B (640 bytes)

Cr Buffer B (640 bytes)

CRSRCB

CBSRCB

8/10

CBSRCA

Capture FIFO B

Cr Buffer A (640 bytes)

YSRCB

CRSRCA

YSRCA

Y Buffer B (1280 bytes)

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 305 306

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Texas-instruments TMS320C64x DSP Manual de usuario Pagina 23

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