AR# 5023: SYNPLIFY: Why does disabling the "Force GSR usage" option still infer the STARTUP block? Using the xc_isgsr attribute?
SYNPLIFY: Why does disabling the "Force GSR usage" option still infer the STARTUP block? Using the xc_isgsr attribute?
Keywords: Synplify, GSR, GR
General Description: Disabling the "Force GSR usage" option still infers the STARTUP block. Why?
Synplify will infer the STARTUP block under the conditions outlined in (Xilinx Solution 4034). However, Synplify 5.0.8 introduces a new attribute, xc_isgsr, to disable STARTUP when the STARTUP exists in a pre-optimized (black-box) netlist (XNF, EDIF, NGO) such as the PCI CORE. Please see (Xilinx Solution 2713). Mark the port/signal of the core which is connected to the GSR pin of the STARTUP.
// Disable STARTUP inference using xc_isgsr // Only for Synplify 5.0.8 and later // Specifies that a reset pin on a black-box is connected to an // internal STARTUP block