From d8f3dff5cfb41f6741e4acbd7db1d48be8b6e371 Mon Sep 17 00:00:00 2001
From: Doesch <doeschma79099@ads1.fh-nuernberg.de>
Date: Thu, 15 Jun 2023 12:53:36 +0200
Subject: [PATCH] fram_interface

---
 fram_interface.sv | 84 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 fram_interface.sv

diff --git a/fram_interface.sv b/fram_interface.sv
new file mode 100644
index 0000000..99bbc9c
--- /dev/null
+++ b/fram_interface.sv
@@ -0,0 +1,84 @@
+`include "FRAM_Controller.sv"
+
+module spi(bus.spi_port b, fram_if.fram_port_top i);
+  parameter ringbuffer_size = 256;
+  
+  logic [19:0] FRAM_Adr;
+  logic [7:0] FRAM_DATA_OUT;
+  logic [7:0] FRAM_DATA_IN;
+  logic FRAM_RW;
+  logic FRAM_RSTATUS;
+  logic FRAM_hbn;
+  logic FRAM_go;
+  logic FRAM_busy;
+  
+  logic [7:0] clk_cntr;
+
+  initial begin    
+    FRAM_Adr <= 20'h0;
+    FRAM_DATA_IN <= 8'h0;
+  	FRAM_RW = 0;
+  	FRAM_RSTATUS = 0;
+  	FRAM_hbn = 0;
+  	FRAM_go = 0;
+    clk_cntr = 0;
+  end
+  
+  always @ (posedge b.timer) begin
+    if(b.dip[0] == 0) begin  //Reset
+      FRAM_Adr <= 20'h0;
+      FRAM_DATA_IN <= 8'h0;
+      FRAM_RW = 0;
+      FRAM_RSTATUS = 0;
+      FRAM_hbn = 0;
+      FRAM_go = 0;
+      clk_cntr = 0;
+    end
+    else if(b.dip[1] == 1) begin //Read
+      FRAM_Adr <= (FRAM_Adr - 1) % (ringbuffer_size - 1);
+      FRAM_RW <= 1'h1; //Read
+      FRAM_go <= 1'h1; //Go
+    end 
+    else if(b.dip[1] == 0) begin //Write
+      FRAM_Adr <= (FRAM_Adr + 1) % (ringbuffer_size - 1);
+      FRAM_DATA_IN <= {6'h0, b.dip[4:3]};
+      FRAM_RW <= 1'h0; //Write Operation
+      FRAM_go <= 1'h1; //Go
+    end      
+  end
+  
+  always @ (posedge b.oszi_clk) begin
+    if(FRAM_go == 1) 
+      clk_cntr <= clk_cntr + 1;
+    
+    if(clk_cntr > 50 && FRAM_RW == 1'h1) begin
+      b.spi_read <= FRAM_DATA_OUT[1:0];
+      FRAM_go <= 1'h0;
+      FRAM_RW <= 1'h0; 
+      clk_cntr <= 0;
+    end
+    else if(clk_cntr > 50 && FRAM_RW == 1'h0) begin
+      FRAM_go <= 1'h0;
+      clk_cntr <= 0;
+    end
+  end
+  
+  
+    FRAM FRAM_ut(
+    .i_clk(b.oszi_clk),
+    .i_nreset(b.dip[0]),
+    .i_adr(FRAM_Adr),
+    .i_data(FRAM_DATA_IN),
+    .o_data(FRAM_DATA_OUT),
+    .i_rw(FRAM_RW),
+    .i_status(FRAM_RSTATUS),
+    .i_hbn(FRAM_hbn),
+    .i_cready(FRAM_go),
+    .o_busy(FRAM_busy),
+    .o_SPI_Clk(i.sclk),
+    .i_SPI_MISO(i.mosi),
+    .o_SPI_MOSI(i.mosi), 
+    .o_SPI_CS_n(i.ss)
+  );
+  
+endmodule
\ No newline at end of file