Technical data

VHDL VITAL SDF

ModelSim EE/PLUS Reference Manual Standard Delay Format (SDF) Timing Annotation

439

Resolvin

errors

If the simulator finds the cell instance but not the generic then an error message is

issued. For example,

ERROR: myasic.sdf(18):

Instance ’/testbench/dut/u1’ does not have a generic named

’tpd_a_y’

In this case, make sure that the design is using the appropriate VITAL library cells.

If it is, then there is probably a mismatch between the SDF and the VITAL cells.

You need to find the cell instance and compare its generic names to those expected

by the annotator. Look in the VHDL source files directly or use the simulator’s

user interface to locate the information:

• Open the Structure window (p162) and navigate to the instance named in the

error message (you could try the Edit > Find menu option). Alternatively, use

the

enable_menu

command (p310) to select the instance. For example:

env /testbench/dut/u1

• Open the Process window (p147) and select the "In Region" mode (the default

mode is "Active").

• Select a process in the Process window (usually the process named

"vitalbehavior").

• Open the Variables window (p165) to see all of the generics and their current

values.

SDF construct Matchin

VHDL

eneric name

(IOPATH a y (3)) tpd_a_y

(IOPATH (posedge clk) q (1) (2)) tpd_clk_q_posedge

(INTERCONNECT u1/y u2/a (5)) tipd_a

(SETUP d (posedge clk) (5)) tsetup_d_clk_noedge_posedge

(HOLD (negedge d) (posedge clk) (5)) thold_d_clk_negedge_posedge

(SETUPHOLD d clk (5) (5)) tsetup_d_clk & thold_d_clk

(WIDTH (COND (reset==1’b0) clk) (5)) tpw_clk_reset_eq_0