Demultiplexers; Lookup Tables - Matrox Helios Series Installation And Hardware Reference

52 Chapter 4: Matrox Helios hardware reference

Demultiplexers

Each acquisition path of the board features a demultiplexer. It can deserialize input
from time-multiplexed video sources on a clock basis; time-multiplexed video
sources can output twice the amount of data as other video sources with less
cabling. When enabled, the demultiplexer assumes that two video streams share
the same data path and that the streams are interleaved based on the clock cycle.
The demultiplexer assumes that on one clock cycle, the data is from one stream
and that on the next clock cycle, the data is from the second stream. The
demultiplexer combines the data from the two streams every second clock cycle
and sends them to the LUTs. The demultiplexer can only deserialize video inputs
that when combined, total a maximum depth of 32 bits per acquisition path on
the dual-Base version or a maximum depth of 64 bits on the single-Full version.

Lookup tables

The board has programmable lookup tables (LUTs).
On the dual-Base version, the LUTs can be operated in the following
configurations per acquisition path:
• 8 palettes of one, two, three, or four 256-entry 8-bit LUTs.
• 4 palettes of one or two 1024 entry 8- or 16-bit LUTs.
• 1 palette of one or two 4096 entry 8- or 16-bit LUTs.
On the single-Full version, the LUTs can be operated in the following
configurations:
• 8 palettes of one, two, three, four, or eight 256-entry 8-bit LUTs.
• 4 palettes of one, two, three, or four 1024-entry 8- or 16-bit LUTs.
• 1 palettes of one, two, three, or four 4096 entry 8- or 16-bit LUTs.
14- and 16-bit data by-pass the LUTs.
1. For example, two 256-entry 8-bit LUTs can map 2-tap, 8-bit data to 8-bit values. In
addition, one 1024-entry 8-bit LUT can map 1-tap, 10-bit data to 8-bit values.
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