Visible to Intel only — GUID: ssm1488439628762
Ixiasoft
Visible to Intel only — GUID: ssm1488439628762
Ixiasoft
2.2.1. Avalon-ST Video Control Packets
An Avalon-ST Video control packet comprises the identifier nibble, and 9 other nibbles which indicate the height, width and interlacing information of any subsequent Avalon-ST Video packets.
Nibble | Description |
---|---|
D0 | Width[15:12] |
D1 | Width[11:8] |
D2 | Width[7:4] |
D3 | Width[3:0] |
D4 | Height[15:12] |
D5 | Height[11:8] |
D6 | Height[7:4] |
D7 | Height[3:0] |
D8 | Interlacing[3:0] |
When the Interlacing nibble indicates an interlaced field, the height nibble gives the height of the individual fields and not that of the equivalent whole frame—for example, a control packet for 1080i video would show a height of 540, not 1080.
Interlaced/Progressive | Interlacing[3] | Interlacing[2] | Interlacing[1] | Interlacing[0] | Description |
---|---|---|---|---|---|
Interlaced | 1 | 1 | 0 | 0 | Interlaced F1 field, paired with the following F0 field |
0 | 1 | Interlaced F1 field, paired with the preceding F0 field | |||
1 | x | Interlaced F1 field, pairing don’t care | |||
0 | 0 | 0 | Interlaced F0 field, paired with the preceding F1 field | ||
0 | 1 | Interlaced F0 field, paired with the following F1 field | |||
1 | x | Interlaced F0 field, pairing don’t care | |||
Progressive | 0 | x | 0 | 1 | Progressive frame, deinterlaced from an f1 field |
0 | 0 | Progressive frame, deinterlaced from an f0 field | |||
1 | x | Progressive frame |
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