vclock.tcl
1.97 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
#################################
# VIDEOCLK (MAX:~45MHz) #
#################################
echo [ format "--------- VLOCK ------------" ]
create_clock \
-name VCLOCK \
-period 18.0 \
-waveform [ list 0.0 9.0 ] \
[ get_pins pllv/FO ]
set_propagated_clock \
[ get_clocks VCLOCK ]
# Get delay from pllv/FO to *reg*/H02 ---------------------------
set vclock_latency_max 100000
foreach_in_collection cur_path \
[ get_timing_paths -nworst 10000 -max_paths 10000 \
-from [get_pins pllv/FO] \
-to [get_pins *reg*/H02] \
-delay max_rise \
] {
set cur_delay [ get_attribute $cur_path arrival ]
set cur_end [ get_attribute $cur_path endpoint ]
set cur_name [ get_attribute $cur_end full_name ]
echo [ format "%s : %s" $cur_name $cur_delay ]
if {$cur_delay < $vclock_latency_max} { set vclock_latency_max $cur_delay }
}
echo [ format "vclock_latency_max : %s" $vclock_latency_max ]
#/*
# * digital video port;
# * synchronous output;
# * set output delay to 50% of cycle time to force flops close to pads;
# */
set_max_delay [ expr 2.0 + $vclock_latency_max ] -from VCLOCK -to PAD_VCLOCK
set_output_delay [ expr 10 - $vclock_latency_max ] -clock VCLOCK -max [get_ports PAD_VDATA*]
set_output_delay [ expr 10 - $vclock_latency_max ] -clock VCLOCK -max [get_ports PAD_VSYNC]
###set_output_delay 0.5 -clock VCLOCK -min [get_ports PAD_VDATA*]
###set_output_delay 0.5 -clock VCLOCK -min [get_ports PAD_VSYNC]
#/*
# * analog video port;
# * PAD_VOA, PAD_VOB, PAD_VOC do not need constraints;
# * the wires from DAC to pads are dont_touch above;
# */
#/*
# * audio port;
# * output synchronous to video clock;
# * set output delay to 50% of cycle time to force flops close to pads;
# */
set_output_delay [ expr 10 - $vclock_latency_max ] -clock VCLOCK -max [list PAD_ACLOCK PAD_ADATA PAD_AWORD]
###set_output_delay 0.5 -clock VCLOCK -min [list PAD_ACLOCK PAD_ADATA PAD_AWORD]