[clkgen] Replace IBUFG with IBUF
The IBUFG primitive doesn't exist in 7 series+ devices and is replaced
by a normal IBUF during syntheis, as Vivado notes:
```
[Netlist 29-432] The IBUFG primitive 'clkgen/io_clk_ibufg' has been
retargeted to an IBUF primitive only. No BUFG will be added. If a
global buffer is intended, please instantiate an available global
clock primitive from the current architecture.
```
In our case we don't need a global buffer as the output of the IBUF(G)
primitive will be fed into a PLL block before being used for logic,
and we add appropriate global clock buffers there.
Signed-off-by: Philipp Wagner <phw@lowrisc.org>
diff --git a/hw/top_earlgrey/rtl/clkgen_xil7series.sv b/hw/top_earlgrey/rtl/clkgen_xil7series.sv
index 2822a62..f3249d5 100644
--- a/hw/top_earlgrey/rtl/clkgen_xil7series.sv
+++ b/hw/top_earlgrey/rtl/clkgen_xil7series.sv
@@ -24,7 +24,7 @@
logic clk_48_unbuf;
// input clock buffer
- IBUFG io_clk_ibufg (
+ IBUF io_clk_ibuf (
.I (IO_CLK),
.O (io_clk_buf)
);
