User guide

13-30
SDF Backannotation
Handling Backannotation to I/O Ports
SDF Reader might incorrectly handle the DEVICE construct for an
output I/O port if the DEVICE construct does not include an output
port name. Consider Figure 13-4; Port B is an I/O port of the instance
U1 of type IO_CELL. If the DEVICE construct is
DEVICE (1:2:3)
VCS assigns the timing value to the generics tpdIn1_B_R,
tpdIn2_B_R, tpdIn1_C_R, tpdIn2_C_R, tpdIn1_B_F, tpdIn2_B_F,
tpdIn1_C_F, and tpdIn2_C_F.
Also, it incorrectly assigns timing values to the following generics
because port B is an I/O port:
tpdB_In1_R, tpdB_In1_F, tpdB_In2_R, and tpdB_In2_F
Figure 13-4 Specifying Delays for an I/O Port in a Device