Altera Video and Image Processing Suite - Manual (Page 288)

Method Call Description
function t_packet_control get_append_garbage
();
—
function int get_garbage_probability ();
—
function void set_width (bit [15:0] w);
—
function void set_height (bit [15:0] h);
—
function void set_interlacing (bit [3:0] i);
—
function void set_append_garbage (t_packet_
control i);
Refer to
append_garbage
member.
function void set_garbage_probability (int i);
—
function string info();
Returns a formatted string containing the
width, height and interlacing members.
Table A-5: Members of c_av_st_video_control Class
Member Description
rand bit[15:0] width;
—
rand bit[15:0] height;
—
rand bit[3:0] interlace;
—
rand t_packet_control append_garbage = off;
The
append_garbage
control is of type
t_
packet_control
, defined as:
typedef
enum{on,off,random} t_packet_control;
rand int garbage_probability = 50;
The source BFM uses
garbage_probability
and
append_garbage
to determine whether or
not to append garbage beats to the end of the
control packets.
Garbage beats are generated with a probability
of Garbage_probability%.
• When a stream of garbage is being
generated, the probability that the stream
terminates is fixed in the source BFM at
10%.
• When garbage is produced, this typically
produces around 1 to 30 beats of garbage
per control packet.
A-20 c_av_st_video_control
UG-VIPSUITE
2015.05.04
Altera Corporation Avalon-ST Video Verification IP Suite
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