DC基本流程教程

module mul(a,b,out); input [3:0]a,b; output [7:0]out; assign out=a*b; endmodule Optimization + Map (Design Compiler) timing info Translate (HDL Compiler) no timing info
0.7 FF clk 0.5 FF 0.65 FF
uncertainty = 0.7 - 0.5 = 0.2ns
20
Specify Latency

set_clock_latency -source 3 [get_clocks A ] set_clock_latency 1 [get_clocks A ]
24
Setting Area Constraint

Attributes > Optimization Constraints > Design Constraints

Unit：um x um
設為“0” Tool會自動合 出最小的面積
25
Save Constraints & Attributes
0.2 ns
22
Setting Input & Output Delay

In Symbol View select all input ports

Attributes > Operating Environment > Input Delay
0.381012 0.133056
0.600213 0.209607
Logic Synthesis with Design Vision
授課教師：洪進華老師 jhhong@.tw 實習助教：陳龍風 lfchen@.tw
1
What is synthesis

Synthesis = translation + optimazation +mapping
Error (只要有任何的Error，合成即會失敗) Warning (部分Warning可忽略，但Multiple Design Instance不可忽略)
module REG4 (q,qn,data,clk,clrn); output [3:0] q, qn; input [3:0] data; input clk, clrn; DFF d0 (q[0],qn[0],data[0],clk,clrn); DFF d1 (q[1],qn[1],data[1],clk,clrn); DFF d2 (q[2],qn[2],data[2],clk,clrn); DFF d3 (q[3],qn[3],data[3],clk,clrn); endmodule

set_dont_touch_network [ find clock A ]

Don’t add any buffer in clock network

set_fix_hold [ find clock A ]
19
Clock Skew

set_clock_uncertainty -setup 0.1 [get_clocks A ]

clk clock source latency network latency
FF
21
Specify Transition Time

set_input_transition -max 0.2 [get_ports E ]
0.2 ns

set_clock_transition -max 0.2 A
14
Setting Input Drive Impedance

set_drive [drive_of "tpz973pnwc/PDIZ/C"] [all_inputs]

PDIZ ： I/O PAD Name C ： Pin Name 可化簡成 = > set_drive 1 [all_inputs]
15
Setting Output Loading

set_load [load_of "tpz773pnwc/PDT02TZ/I"] [all_outputs]

PDT02TZ ： I/O PAD Name I ： Pin Name 可化簡成 = > set_load 1 [all_outputs]
18
Specify Clock

create_clock -name "A" -period B -waveform {C D} {E}

A Æ clock name. B Æ工作時脈，ex. 10 (ns) C Æ rising edge ex. 0 D Æ failling edge，ex.工作時脈/2 = 5 (ns) E Æ your module clock pin name.
切換到Design view, 並選擇multiple design instance
不建議使用
31
Method 1: dont_touch (.cont)

Attributes > Optimization Directives > Design
不建議使用
32
Method 2: ungroup
4
Invoke Design Vision

source synthesis.csh mkdir xxxx cd xxxx
複製 “.synopsys_dc.setup” 到你目前的目錄xxxx



5
Invoke Design Vision (.cont)

design_vision& (or dv & )

top (worst case) ，enclosed (middle) ，segmented (optimistic)
17
Setting Design Constraint

Define clock specification
1. 2. 3. 4. 5. 6. 7.
Period Waveform Uncertainty Æ skew Source latency Network latency Input tarnsition Clock transition

File > Save Info > Design Setup

將之前下的所有命令存檔 => top_setup.dc
26
Assign Problem

在top_setup.dc中加入以下描述，以消除gate level netlist 中的assign
set verilogout_no_tri true foreach_in_collection design [ get_designs "*"] { current_design $design set_fix_multiple_port_nets -all -buffer_constants } set_fix_multiple_port_nets -all -buffer_constants
2
1
12
Setting Design Environment
13
Setting Operating Condition

Attributes>Operating Environment>Operating Conditions
Worst
Best
set_operating_conditions -min_library fast -min fast -max_library slow -max slow 0.18可直接在Command Mode輸入
28
Execute Script File

File > Execute Script

執行你的top_setup.dc
29
Check Design

Execute check_design before you compile the design

Design > Check Design

30
Method 1: dont_touch
1. 2. 3. 4.
Select the multiple design instances block Compile the block(否則做完don’t_touch會不能compile) Attributes > Optimization Directives > Design Compile the whole design
27
Change Naming Rule

在top_setup.dc中加入以下描述
set bus_inference_style {%s[%d]} set bus_naming_style {%s[%d]} set hdlout_internal_busses true change_name -hierarchy -rules verilog define_name_rules name_rule -allowed "a-z A-Z 0-9 _" -max_length 255 -type cell define_name_rules name_rule -allowed "a-z A-Z 0-9 _[]" -max_length 255 -type net define_name_rules name_rule -map {{"\*cell\*" "cell"}} define_name_rules name_rule -case_insensitive change_names -hierarchy -rules name_rule