Git-Mirrors/tillitis-key
1
0
Fork 0
mirror of https://github.com/tillitis/tillitis-key1.git synced 2025-07-24 15:35:23 -04:00
Code Issues Projects Releases Packages Wiki Activity

Update PicoRV32 clock frequency to 24 MHz

Browse source 
Include a seed value for nextpnr to get a layout that
reaches 24 MHz.
This commit is contained in:
Jonas Thörnblad 2024-10-22 15:27:53 +02:00
parent c6e8b6930c
commit 1651a1a666
No known key found for this signature in database
GPG key ID: 2D318AD00A326F95
5 changed files with 13 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

6
hw/application_fpga/core/uart/rtl/uart.v
View file

@ -83,10 +83,10 @@ module uart (
// The default bit rate is based on target clock frequency
// divided by the bit rate times in order to hit the
// center of the bits. I.e.
// Clock: 21 MHz, 62500 bps
// Divisor = 21E6 / 62500 = 336
// Clock: 24 MHz, 62500 bps
// Divisor = 24E6 / 62500 = 384
// This also satisfies 1E6 % bps == 0 for the CH552 MCU used for USB-serial
localparam DEFAULT_BIT_RATE = 16'd336;
localparam DEFAULT_BIT_RATE = 16'd384;
localparam DEFAULT_DATA_BITS = 4'h8;
localparam DEFAULT_STOP_BITS = 2'h1;