Video Port/VCXO Interpolated Control (VIC) Port User's Guide

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3.14 Video Capture FIFO Registers

Video Capture FIFO Registers

The capture FIFO mapping registers are listed in Table 3-34 . These registers provide read access to the

capture FIFOs. These pseudo-registers should be mapped into DSP memory space rather than

configuration register space in order to provide high-speed access. See the device-specific datasheet for

the memory address of these registers. The function of the video capture FIFO mapping registers is listed

in Table 3-35 .

Table 3-34. Video Capture FIFO Registers

Offset Address

(1)

Acronym Register Name

00h YSRCA Y FIFO Source Register A

20h CBSRCA Cb FIFO Source Register A

40h CRSRCA Cr FIFO Source Register A

00h YSRCB Y FIFO Source Register B

20h CBSRCB Cb FIFO Source Register B

40h CRSRCB Cr FIFO Source Register B

(1)

The absolute address of the registers is device/port specific and is equal to the FIFO base address

+ offset address. See the device-specific datasheet to verify the register addresses.

Table 3-35. Video Capture FIFO Registers Function

Capture Mode

YSRC x Maps Y capture buffer into DSP Maps data capture buffer into the Maps data capture buffer into the

memory. DSP memory. DSP memory.

CBSRC x Maps Cb capture buffer into DSP Not used. Not used.

memory.

CRSRC x Maps Cr capture buffer into DSP Not used. Not used.

memory.

In BT.656 or Y/C capture mode, three EDMAs move data from the Y, Cb, and Cr capture FIFOs to the

DSP memory by using the memory-mapped YSRC x, CBSRC x, and CRSRC x registers. The EDMA

transfers are triggered by the YEVT, CbEVT, and CrEVT events, respectively.

In raw capture mode, one EDMA channel moves data from the Y capture FIFO to the DSP memory by

using the memory-mapped YSRC x register. The EDMA transfers are triggered by a YEVT event.

The video port packs receive data into 64-bit words in the FIFO and the EDMA should always move

64-bit-wide data from YSRC x, CBSRC x, and CRSRC x to the memory.

SPRUEM1 – May 2007 Video Capture Port 91

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