Frequencies adjusted

Author: Daniel Cliche

README.md

@@ -7,7 +7,7 @@ The documentation is available here: https://danodus.github.io/xgsoc/
 # Features
 
 - RISC-V (RV32IM)
-- UART (2000000-N-8-1)
+- UART (1000000-N-8-1)
 - SDRAM (32MiB shared between CPU and video)
 - Set associative cache (4-way with LRU replacement policy)
 - VGA (60 Hz), 480p (60Hz), 720p (60Hz) or 1080p (30Hz) HDMI video output with framebuffer (RGB565)
@@ -57,7 +57,7 @@ cd rtl/ulx3s
 make clean;make VIDEO=<video mode> prog
 cd ../../src/test_graphite
 make run SERIAL=<serial device>
-picocom -b 2000000 <serial device>
+picocom -b 1000000 <serial device>
 ```
 
 and press 'h' for help.
@@ -86,7 +86,7 @@ To upload and run the program to the FPGA platform:
 ```bash
 cd src/<program name>
 make run SERIAL=<serial device>
-picocom -b 2000000 <serial device>
+picocom -b 1000000 <serial device>
 ```
 
 The following programs are available:

rtl/ulx3s/pll_cpu.v

@@ -5,12 +5,11 @@
 module pll_cpu
 (
     input clkin, // 25 MHz, 0 deg
-    output clkout0, // 48 MHz, 0 deg
+    output clkout0, // 30 MHz, 0 deg
     output locked
 );
-wire clkfb;
 (* FREQUENCY_PIN_CLKI="25" *)
-(* FREQUENCY_PIN_CLKOS="48" *)
+(* FREQUENCY_PIN_CLKOP="30" *)
 (* ICP_CURRENT="12" *) (* LPF_RESISTOR="8" *) (* MFG_ENABLE_FILTEROPAMP="1" *) (* MFG_GMCREF_SEL="2" *)
 EHXPLLL #(
         .PLLRST_ENA("DISABLED"),
@@ -23,22 +22,17 @@ EHXPLLL #(
         .OUTDIVIDER_MUXD("DIVD"),
         .CLKI_DIV(5),
         .CLKOP_ENABLE("ENABLED"),
-        .CLKOP_DIV(48),
+        .CLKOP_DIV(20),
         .CLKOP_CPHASE(9),
         .CLKOP_FPHASE(0),
-        .CLKOS_ENABLE("ENABLED"),
-        .CLKOS_DIV(10),
-        .CLKOS_CPHASE(0),
-        .CLKOS_FPHASE(0),
         .FEEDBK_PATH("CLKOP"),
-        .CLKFB_DIV(2)
+        .CLKFB_DIV(6)
     ) pll_i (
         .RST(1'b0),
         .STDBY(1'b0),
         .CLKI(clkin),
-        .CLKOP(clkfb),
-        .CLKOS(clkout0),
-        .CLKFB(clkfb),
+        .CLKOP(clkout0),
+        .CLKFB(clkout0),
         .CLKINTFB(),
         .PHASESEL0(1'b0),
         .PHASESEL1(1'b0),

rtl/ulx3s/pll_sdram.v

@@ -5,12 +5,11 @@
 module pll_sdram
 (
     input clkin, // 25 MHz, 0 deg
-    output clkout0, // 96 MHz, 0 deg
+    output clkout0, // 90 MHz, 0 deg
     output locked
 );
-wire clkfb;
 (* FREQUENCY_PIN_CLKI="25" *)
-(* FREQUENCY_PIN_CLKOS="96" *)
+(* FREQUENCY_PIN_CLKOP="90" *)
 (* ICP_CURRENT="12" *) (* LPF_RESISTOR="8" *) (* MFG_ENABLE_FILTEROPAMP="1" *) (* MFG_GMCREF_SEL="2" *)
 EHXPLLL #(
         .PLLRST_ENA("DISABLED"),
@@ -23,22 +22,17 @@ EHXPLLL #(
         .OUTDIVIDER_MUXD("DIVD"),
         .CLKI_DIV(5),
         .CLKOP_ENABLE("ENABLED"),
-        .CLKOP_DIV(48),
-        .CLKOP_CPHASE(9),
+        .CLKOP_DIV(7),
+        .CLKOP_CPHASE(3),
         .CLKOP_FPHASE(0),
-        .CLKOS_ENABLE("ENABLED"),
-        .CLKOS_DIV(5),
-        .CLKOS_CPHASE(0),
-        .CLKOS_FPHASE(0),
         .FEEDBK_PATH("CLKOP"),
-        .CLKFB_DIV(2)
+        .CLKFB_DIV(18)
     ) pll_i (
         .RST(1'b0),
         .STDBY(1'b0),
         .CLKI(clkin),
-        .CLKOP(clkfb),
-        .CLKOS(clkout0),
-        .CLKFB(clkfb),
+        .CLKOP(clkout0),
+        .CLKFB(clkout0),
         .CLKINTFB(),
         .PHASESEL0(1'b0),
         .PHASESEL1(1'b0),

rtl/ulx3s/ulx3s_v31_top.sv

@@ -102,8 +102,8 @@ module ulx3s_v31_top(
     assign pll_locked = pll_cpu_locked & pll_sdram_locked & pll_video_locked;
 
     soc_top #(
-        .FREQ_HZ(48_000_000),
-        .BAUD_RATE(2_000_000)
+        .FREQ_HZ(30_000_000),
+        .BAUD_RATE(1_000_000)
     ) soc_top(
         .clk_cpu(clk_cpu),
         .clk_sdram(clk_sdram),

utils/sendbin.py

@@ -27,7 +27,7 @@ def main(argv):
         exit(0)
     else:
         try:
-            ser = serial.Serial(argv[0], baudrate=230400)
+            ser = serial.Serial(argv[0], baudrate=1000000)
         except serial.serialutil.SerialException:
             print("Unable to open the serial device {0}".format(argv[0]))
             exit(1)

utils/sendhex.py

@@ -23,7 +23,7 @@ def main(argv):
             delay_block = float(argv[3])
 
         try:
-            ser = serial.Serial(argv[0], baudrate=2000000)
+            ser = serial.Serial(argv[0], baudrate=1000000)
         except serial.serialutil.SerialException:
             print("Unable to open the serial device {0}".format(argv[0]))
             exit(1)