BT848 ETC, BT848 Datasheet - Page 52

• Manufacturer Part Number: BT848
• Description: Single-Chip Video Capture for PCI
• Manufacturer: ETC

F
Video Data Format Conversion
42
UNCTIONAL
Byte Swapping
D
ESCRIPTION
Before the data enters the FIFO it passes through a 4-way mux to allow swapping
of the bytes to support Macintosh (big endian) color data formats. The pixel
DWORD PD[31:0] maps onto the FIFO input FI[31:0]. The byte-swap mux
remaps the data bytes, but byte lane 0 or bits[7:0] will still be considered the first
byte of the scan line.
Table 8. Byte Swapping Map
Note: The byte swapping mode is disabled during VBI data.
FIFO Inputs
Word Swap
Byte Swap
[31:24]
[23:16]
[15:8]
[7:0]
L848A_A
[31:24]
[23:16]
[15:8]
[7:0]
0
Outputs of FIFO Data Formatter
0
[23:16]
[31:24]
[15:8]
[7:0]
1
Single-Chip Video Capture for PCI
[31:24]
[23:16]
[15:8]
[7:0]
0
Bt848/848A/849A
1
Brooktree
[23:16]
[31:24]
[15:8]
[7:0]
1
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