From d228ee4a3b0b560b82e7c3e18f33a90fe0e45f8f Mon Sep 17 00:00:00 2001
From: ks6n19 <ks6n19@soton.ac.uk>
Date: Sat, 14 Nov 2020 08:45:00 +0000
Subject: [PATCH] Update ahb_out.sv to include ahb_pixel memory HADDR
---
behavioural/ahb_out.sv | 33 +++++++++++++++++++++++++++++++--
1 file changed, 31 insertions(+), 2 deletions(-)
diff --git a/behavioural/ahb_out.sv b/behavioural/ahb_out.sv
index 626ba18..ba29b69 100644
--- a/behavioural/ahb_out.sv
+++ b/behavioural/ahb_out.sv
@@ -40,12 +40,16 @@ module ahb_out(
input HWRITE,
input HREADY,
input HSEL,
+ //Non-AHB signals
+ input logic [9:0] pixel_x ,
+ input logic [8:0] pixel_y ,
// AHB Signals from Slave to Master
output logic [31:0] HRDATA,
output HREADYOUT,
//Non-AHB Signals
+ output logic pixel,
output logic [8:0] x1, x2, y1, y2, x3, y3
);
@@ -58,7 +62,11 @@ timeprecision 100ps;
//control signals are stored in registers
logic write_enable, read_enable;
logic [2:0] word_address ;
+ logic [18:0] word_address_memory;
+ logic [18:0] pixel_address ;
+ //memory
+ logic [0:0] memory [0:307199] ;
logic NextDataValid;
logic [15:0] Status;
@@ -70,6 +78,7 @@ timeprecision 100ps;
write_enable <= '0;
read_enable <= '0;
word_address <= '0;
+ word_address_memory <= '0;
end
else if ( HREADY && HSEL && (HTRANS != No_Transfer) )
@@ -77,6 +86,7 @@ timeprecision 100ps;
write_enable <= HWRITE;
read_enable <= ! HWRITE;
word_address <= HADDR[4:2];
+ word_address_memory <= HADDR[23:5] ;
end
else
@@ -84,6 +94,7 @@ timeprecision 100ps;
write_enable <= '0;
read_enable <= '0;
word_address <= '0;
+ word_address_memory <= '0;
end
//Act on control signals in the data phase
@@ -124,7 +135,26 @@ timeprecision 100ps;
else if ( write_enable && (word_address==5))
y3 <= HWDATA[15:0];
-
+ initial
+
+memory = '{307200{0}};
+
+ //memory
+ always_ff @(posedge HCLK)
+ begin
+ if( write_enable )
+ memory[word_address_memory] <= HWDATA ;
+ end
+
+ always_comb
+ pixel_address = (pixel_y * 640) + pixel_x ;
+
+
+ always_ff @(posedge HCLK)
+ begin
+ pixel <= memory[pixel_address] ;
+ end
+
//read
@@ -135,7 +165,6 @@ timeprecision 100ps;
HRDATA = '0;
else
case (word_address)
- // ensure that half-word data is correctly aligned
0 : HRDATA = { 23'd0, x1 };
1 : HRDATA = { 23'd0, y1 };
2 : HRDATA = { 23'd0, x2 };
--
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