Altera Video and Image Processing Suite User Manual
Page 205
Parameter
Value
Description
Write FIFO burst target 2–256,
Default = 32
Select the burst target for the write-only Avalon-MM interface.
Read FIFO depth
16–1024,
Default = 64
Select the FIFO depth of the read-only Avalon-MM interface.
Read FIFO burst target 2–256,
Default = 32
Select the burst target for the read-only Avalon-MM interface.
Align read/write bursts
on read boundaries
On or Off
Turn on to avoid initiating read and write bursts at a position
that would cause the crossing of a memory row boundary.
Frame buffer memory
base address
Any 32-bit
value, Default
=
0x00000000
Select a hexadecimal address of the frame buffers in external
memory when buffering is used. The information message
displays the number of frame buffers and the total memory
required at the specified base address.
Maximum ancillary
packets per frame
Any 32-bit
value, Default
= 0
Specify the number of non-image, non-control, Avalon-ST Video
packets that can be buffered with each frame. Older packets are
discarded first in case of an overflow.
Note: The Maximum length ancillary packets in symbols
parameter is disabled or unused when you specify the
number of packets buffered per frame to 0.
User packets are no longer delayed through the DDR memory (as
with the Frame Buffer I IP core). The packets are instead grouped
at the output immediately following the next control packet.
Then the video packets swap places with the user packets which
arrive before the next control packet.
Maximum length
ancillary packets in
symbols
10–
1024,Default
= 10
Select the maximum packet length as a number of symbols. The
minimum value is 10 because this is the size of an Avalon-ST
control packet (header included). Extra samples are discarded if
the packets are larger than allowed.
Frame dropping
On or Off
Turn on to allow frame dropping.
Frame repeating
On or Off
Turn on to allow frame repetition.
Locked rate support
On or Off
Turn on to add an Avalon-MM slave interface that synchronizes
the input and output frame rates.
Note: You can only turn on this parameter if you also turn
on Frame dropping, Frame repeating, and Run-time
writer control parameters.
Drop invalid frames
On or Off
Turn on to drop image data packets that have lengths that are not
compatible with the dimensions declared in the last control
packet.
Run-time writer
control
On or Off
Run-time control for the write interface.
14-8
Frame Buffer Parameter Settings
UG-VIPSUITE
2015.05.04
Altera Corporation
Frame Buffer IP Cores