From e996b5498ad2af93b7a98bd0d476da8ed591d4e1 Mon Sep 17 00:00:00 2001
From: Inoki <veyx.shaw@gmail.com>
Date: Sat, 19 Mar 2022 14:06:32 +0100
Subject: [PATCH] Add Alinx AX309 board as a target

Running at 32MHz with 115200 baud rate UART (using the on-board RS232)
---
 data/ax309.ucf                    |  9 ++++++++
 servant.core                      | 19 +++++++++++++++++
 servant/servant_ax309.v           | 32 ++++++++++++++++++++++++++++
 servant/servant_ax309_clock_gen.v | 35 +++++++++++++++++++++++++++++++
 4 files changed, 95 insertions(+)
 create mode 100644 data/ax309.ucf
 create mode 100644 servant/servant_ax309.v
 create mode 100644 servant/servant_ax309_clock_gen.v

diff --git a/data/ax309.ucf b/data/ax309.ucf
new file mode 100644
index 0000000..b965f99
--- /dev/null
+++ b/data/ax309.ucf
@@ -0,0 +1,9 @@
+CONFIG VCCAUX=3.3;
+
+NET i_clk     LOC = T8  | IOSTANDARD = LVCMOS33;
+NET i_rst     LOC = L3  | IOSTANDARD = LVCMOS33;
+NET q         LOC = P4  | IOSTANDARD = LVCMOS33;
+NET o_uart_tx LOC = D12 | IOSTANDARD = LVCMOS33;
+
+NET i_clk TNM_NET = sys_clk_pin;
+TIMESPEC TS_USER_CLOCK = PERIOD sys_clk_pin 50000 kHz;
diff --git a/servant.core b/servant.core
index dca02cd..aa4ca08 100644
--- a/servant.core
+++ b/servant.core
@@ -104,6 +104,12 @@ filesets:
       - data/go_board.pcf : {file_type : PCF}
       - servant/service_go_board.v : {file_type : verilogSource}
 
+  ax309:
+    files:
+      - servant/servant_ax309_clock_gen.v : {file_type : verilogSource}
+      - servant/servant_ax309.v : {file_type : verilogSource}
+      - data/ax309.ucf : {file_type : UCF}
+
   lx9_microboard:
     files:
       - servant/servant_lx9_clock_gen.v : {file_type : verilogSource}
@@ -277,6 +283,19 @@ targets:
         speed   : -2
     toplevel : servant_lx9
 
+  ax309:
+    default_tool : ise
+    description : XILINX Spartan-6 XC6SLX9 FPGA Development Board
+    filesets : [mem_files, soc, ax309]
+    parameters : [memfile, memsize]
+    tools:
+      ise:
+        family  : Spartan6
+        device  : xc6slx9
+        package : ftg256
+        speed   : -3
+    toplevel : servant_ax309
+
   tinyfpga_bx:
     default_tool : icestorm
     filesets : [mem_files, soc, service, tinyfpga_bx]
diff --git a/servant/servant_ax309.v b/servant/servant_ax309.v
new file mode 100644
index 0000000..78fe8e7
--- /dev/null
+++ b/servant/servant_ax309.v
@@ -0,0 +1,32 @@
+`default_nettype none
+module servant_ax309
+(
+ input wire  i_clk,
+ input wire  i_rst,
+ output wire o_uart_tx,
+ output wire q);
+
+   parameter memfile = "zephyr_hello.hex";
+   parameter memsize = 8192;
+
+   wire      wb_clk;
+   wire      wb_rst;
+
+   assign o_uart_tx = q;
+
+   servant_ax309_clock_gen
+   clock_gen
+     (.i_clk (i_clk),
+      .i_rst (i_rst),
+      .o_clk (wb_clk),
+      .o_rst (wb_rst));
+
+   servant
+     #(.memfile (memfile),
+       .memsize (memsize))
+   servant
+     (.wb_clk (wb_clk),
+      .wb_rst (wb_rst),
+      .q      (q));
+
+endmodule
diff --git a/servant/servant_ax309_clock_gen.v b/servant/servant_ax309_clock_gen.v
new file mode 100644
index 0000000..f10b2f1
--- /dev/null
+++ b/servant/servant_ax309_clock_gen.v
@@ -0,0 +1,35 @@
+`default_nettype none
+module servant_ax309_clock_gen
+  (input wire  i_clk,
+   input wire  i_rst,
+   output wire o_clk,
+   output reg  o_rst);
+
+   wire   clkfb;
+   wire   locked;
+   reg 	  locked_r;
+
+   PLL_BASE
+     #(.BANDWIDTH("OPTIMIZED"),
+       .CLKFBOUT_MULT(16),
+       .CLKIN_PERIOD(20.0), //50MHz
+       .CLKOUT1_DIVIDE(25), //32MHz
+       .DIVCLK_DIVIDE(1))
+   PLL_BASE_inst
+     (.CLKOUT1(o_clk),
+      .CLKOUT2(),
+      .CLKOUT3(),
+      .CLKOUT4(),
+      .CLKOUT5(),
+      .CLKFBOUT(clkfb),
+      .LOCKED(locked),
+      .CLKIN(i_clk),
+      .RST(~i_rst),
+      .CLKFBIN(clkfb));
+
+   always @(posedge o_clk) begin
+      locked_r <= locked;
+      o_rst  <= !locked_r;
+   end
+
+endmodule