FlexTest WDB Translation Support

Using wdb2flex Effectively

 

 

4.For each clock pin, set up return pin constraints corresponding to the control file (SR0, SR1, R0, R1), with an offset value equal to the timeframe at which the clock goes active. The pulse width should correspond to the difference between the timeframe at which the clock goes inactive and the timeframe at which the clock goes active.

For the example in Figure B-2, you would enter the following to indicate that CLK has an offset of 0 and a width of 1.

add pin constraints clk sr0 1 0 1

5.For all output pins, specify the strobe timeframe corresponding to the strobe time in the control file. For the example in Figure B-2, you would enter the following:

setup pin strobes 1

0

50 70 90100

150

200

250

ENABLE

 

 

 

 

 

ABUS

 

 

 

 

 

CNTRL

 

 

 

 

 

CLK

 

 

 

 

 

OPA

 

 

 

 

 

 

75

105

 

205

 

t1

 

t2

 

t3

 

 

Frame 0

 

Frame 1

Frame 2

There are three input pins, ENABLE, ABUS, and CNTRL; one clock pin, CLK; and one output pin, OPA. Note that FlexTest strobes all waveforms 5 ns after the waveform changes state to ensure that it strobes the proper state.

Figure B-2. Detailed Pin Timing

FastScan and FlexTest Reference Manual, V8.6_4

B-9

Page 823
Image 823
Mentor v8.6_4 manual Figure B-2. Detailed Pin Timing