From 20c2fd524f03a92a6f414e3a5313501ef6bd5533 Mon Sep 17 00:00:00 2001 From: matt Date: Sun, 21 Sep 2008 17:57:02 +0000 Subject: attach a 16 bit device to the bus and make it look like a 32 bit device git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@9635 221aa14e-8319-0410-a670-987f0aec2ac5 --- control_lib/wb_bridge_16_32.v | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 control_lib/wb_bridge_16_32.v (limited to 'control_lib') diff --git a/control_lib/wb_bridge_16_32.v b/control_lib/wb_bridge_16_32.v new file mode 100644 index 000000000..405e25c3c --- /dev/null +++ b/control_lib/wb_bridge_16_32.v @@ -0,0 +1,36 @@ + + +module wb_bridge_16_32 + #(parameter AWIDTH=16) + (input wb_clk, input wb_rst, + input A_cyc_i, input A_stb_i, input A_we_i, input [3:0] A_sel_i, + input [AWIDTH-1:0] A_adr_i, input [31:0] A_dat_i, output [31:0] A_dat_o, output A_ack_o, + output B_cyc_o, output B_stb_o, output B_we_o, output [1:0] B_sel_o, + output [AWIDTH-1:0] B_adr_o, output [15:0] B_dat_o, input [15:0] B_dat_i, input B_ack_i + ); + + reg [15:0] holding; + reg phase; + + assign B_adr_o = {A_adr_i[AWIDTH-1:2],phase,1'b0}; + assign B_cyc_o = A_cyc_i; + assign B_stb_o = A_stb_i; + assign B_we_o = A_we_i; + + assign B_dat_o = ~phase ? A_dat_i[15:0] : A_dat_i[31:16]; + assign B_sel_o = ~phase ? A_sel_i[1:0] : A_sel_i[3:2]; + + assign A_dat_o = {B_dat_i,holding}; + assign A_ack_o = phase & B_ack_i; + + always @(posedge wb_clk) + if(wb_rst) + phase <= 0; + else if(B_ack_i) + phase <= ~phase; + + always @(posedge wb_clk) + if(~phase & B_ack_i) + holding <= B_dat_i; + +endmodule // wb_bridge_16_32 -- cgit v1.2.3