The vertical size register has a dual purpose: first to hold the number of vertical lines, and second to be the mechanism for starting an S2MM transfer. If S2MM_DMACR.RS = 1, a write to this register transfers the video parameters and start addresses to an internal register block for VDMA controller use. This register must be written last for a particular channel.
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X-Ref Target - Figure 2-17 
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|
Bits |
Field Name |
Default Value |
Access Type |
Description |
|---|---|---|---|---|
|
31–13 |
Reserved |
0h |
RO |
Writing to these bits has no effect, and they are always read as zeros. |
|
12–0 |
Vertical Size (Lines) |
0h |
R/W |
Indicates vertical size in lines of the video data to transfer. Note: Writing a value of zero in this field causes a VDMAIntErr to be flagged in the S2MM_VDMASR register on the next frame boundary. |