Internal Modules
249
SPRUHI7A – December 2012 – Revised June 2016
Copyright © 2012–2016, Texas Instruments Incorporated
High-Definition Video Processing Subsystem (HDVPSS)
Table 1-91. Sync on Client Field Descriptions (Word - 3)
Bits
Name
Description
31-27
Packet Type
Host Packet Descriptor Type = Ch
26-24
Reserved
Reserved
23-16
Source
Specifies the source used for the control
event.
15-4
Reserved
Reserved for future use
3-0
Control
Control type = 0
1.2.13.3.3.3.2 Sync on List
The Sync on List Control descriptor is a mechanism to ensure that multiple lists have all reached a
common point. The Sync on List descriptor uses the Source field as a mask for each list that should be
synchronized which must include the list where the control descriptor resides. Once all lists specified in
the source field have reached their Sync on List descriptor all lists will resume with the lowest list number
resuming first. All Sync on List Control descriptors in each of the lists must have the same source field so
that all lists will synchronize upon reaching that point.
If it is desired to synchronize list 0 and list 1 then the source field would be 0x3. If it is desired to
synchronize list 1, list 3, and list 4 then the source field would be 0x1a. Word 0, Word 1 and Word 2 are
reserved.
Table 1-92. Sync on List Field Descriptions (Word - 3)
Bits
Name
Description
31-27
Packet Type
Host Packet Descriptor Type = Ch
26-24
Reserved
Reserved
23-16
Source
Specifies the source used for the control
event.
15-4
Reserved
Reserved for future use
3-0
Control
Control type = 1h
1.2.13.3.3.3.3 Sync on External Event
A Sync on External Event descriptor ensures an external event has occurred before proceeding. The
external event can be a write to a bit of the LIST_STAT_SYNC register or other external events that are
determined at VPDMA elaboration to have occurred. This descriptor can be used to allow for external
software to control progression of the list. The descriptor can also be used to select external signals that
are brought into the VPDMA. Source values 0-7 are for the respective bits in the LIST_STAT_SYNC
register. The processing of a Sync on External Event descriptor will result in a handshake the clears that
bit of the LIST_STAT_SYNC register. Word 0, Word 1 and Word 2 are reserved.
Table 1-93. Sync on External Event Field Descriptions (Word - 3)
Bits
Name
Description
31-27
Packet Type
Host Packet Descriptor Type = Ch
26-24
Reserved
Reserved
23-16
Source
Specifies the source used for the control
event.
15-4
Reserved
Reserved for future use
3-0
Control
Control type = 2h
