Texas Instruments DM38x DaVinci, User Manual

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Registers
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738 SPRUHI7A – December 2012 – Revised June 2016
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High-Definition Video Processing Subsystem (HDVPSS)
1.3.8.122 VPDMA_nf_420_y_in_cstat Register (offset = 3B8h) [reset = 0h]
VPDMA_nf_420_y_in_cstat is shown in Figure 1-422 and described in Table 1-334 .
Figure 1-422. VPDMA_nf_420_y_in_cstat Register
31 30 29 28 27 26 25 24
REQ_DELAY
R/W-0h
23 22 21 20 19 18 17 16
REQ_RATE
R-0h
15 14 13 12 11 10 9 8
BUSY DMA_ACTIVE FRAME_START Reserved
R-0h R-0h R/W-0h R-0h
7 6 5 4 3 2 1 0
Reserved
R-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 1-334. VPDMA_nf_420_y_in_cstat Register Field Descriptions
Bit Field Type Reset Description
31-24 REQ_DELAY R/W 0h
The minimum number of clock cycles between requests being
issued. This value is multiplied by 32 to get the actual number of
cycles.This value is only accurate for the current frame. The internal
counters used to calculate the rate are reset when a new frame
begins and the first request of a frame will go as soon as possible.
23-16 REQ_RATE R 0h
The number of clock cycles between the last two requests issued.
This value is multiplied by 32 to get the actual number of cycles.This
value is only accurate for the current frame. The internal counters
used to calculate the rate are reset when a new frame begins.
15 BUSY R 0h
Signals if the client is currently active. This bit is set as soon as we
the channel is received by the client from the list manager and is
cleared when the channel is cleared from the shared memory.
14 DMA_ACTIVE R 0h
Signals if the client is currently actively sending DMA requests
13-10 FRAME_START R/W 0h
The source of the start frame event for the client.
0 = Change in hdmi_field_id
1 = Change in dvo2_field_id
2 = RESERVED
3 = Change in value of sd_field_id
4 = Change in value of List Manager Internal Field - 0
5 = Change in value of List Manager Internal Field - 1
6 = Change in value of List Manager Internal Field - 2
7 = Start whenever channel is free
9-0 Reserved R 0h