Internal Modules
242
SPRUHI7A – December 2012 – Revised June 2016
Copyright © 2012–2016, Texas Instruments Incorporated
High-Definition Video Processing Subsystem (HDVPSS)
1.2.13.3.1.4.5.1 Priority Level Control at L3 Level
Four priority levels are supported at L3 level for all VPMDA transfers that use two bits (Pressure[1] and
Pressure[0], shown in
). Pressure[0] is auto-controlled by VPDMA based on buffer levels.
Pressure[1] can be configured in the chip level register: Bit 8 of 0x48140608 is used to set the Pressure[1]
bit of the VPDMA master port0 (mst0); Bit 10 of 0x48140608 is used to set the Pressure[1] bit of the
VPDMA master port1 (mst1).
It is recommended to use the same priority for both VPDMA masters.
NOTE:
The higher the value, the higher the priority; that is, a priority level of 3 is prioritized over a
priority level of 2.
1.2.13.3.1.4.5.2 Priority Level Control at EMIF Level
Eight levels of priority can be set at the EMIF level using three bits (MReqPriority[2:0]).
Table 1-77. Priority Bit Fields
Priority[11]
Priority[10]
Priority[9]
Priority [11:9]
Priority at EMIF
0
0
0
0
0
0
0
1
1
1
0
1
0
2
2
0
1
1
3
3
1
0
0
4
4
1
0
1
5
5
1
1
0
6
6
1
1
1
7
7
As shown in
, Bit 10 of priority bit-field is ignored. Bits 9 and 11 are used to set the priority at
EMIF level.
NOTE:
The higher the value, the lower the priority; that is, a priority level of 2 is prioritized over a
priority level of 3.
1.2.13.3.1.4.6 Next Channel
Bits 8:0 give the next channel to use. This value MUST be the same as the channel.
1.2.13.3.1.5 Data Packet Descriptor Word 4
1.2.13.3.1.5.1 Inbound data
Table 1-78. Data Packet Descriptor Word 4 Inbound Data Field Descriptions
Bits
Name
Description
31-16
Frame Width
Width of the client frame.
15-0
Frame Height
Height of the client frame
1.2.13.3.1.5.1.1 Frame Width
Bits 31:16 indicate the width in pixels of the frame. This is the width of the entire frame and not just the
width of the data represented by the current channel unless this channel fills the entire frame. This allows
for the VPDMA to present a larger frame of data to the client while only fetching the required data. The
currently supported maximum width is 4096.
