Cadence Q DRIVE SERIES User Manual download pdf (Page 7)

INPUT PORTS OUTPUT PORTS

Previous Module

Next Module

My Module

Set Input Delay

to (tclkq+Tin)

Set External Delay

to (tsu+Tex)

Previous Module must supply the earliest and latest data

arrival times to my INPUT PORTS with respect to clock.

These data arrival times constitute my input delays, and

they have to be specified

by set_delay_input command in my timing.tcl file.

Tin

Tex

Next Module must supply the earliest and latest required

data times at my OUTPUT PORTS with respect to clock.

These required data times constitute my external output

delays, and they have to be specified

by set_external _delay command in my timing.tcl file.

Tearly

Tlate

Tearly

= th

system_clock

DATA

EXAMPLE:

set_input_delay -clock system_clock -early (tclkq + Tin_min) -late (tclkq + Tin_max) -rise [all_inputs]

Tperiod - Tlate

= tsu

Tperiod

set_external_delay -clock system_clock -early (tclkq) -late (Tperiod - tsu - Tex_max) -rise [all_outputs]

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Cadence Q DRIVE SERIES User Manual Page 7