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https://github.com/openhwgroup/cvw
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Update ahbapbbridge.sv
Program clean up
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@ -27,27 +27,27 @@
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module ahbapbbridge import cvw::*; #(parameter cvw_t P,
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module ahbapbbridge import cvw::*; #(parameter cvw_t P,
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parameter PERIPHS = 2) (
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parameter PERIPHS = 2) (
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input logic HCLK, HRESETn,
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input logic HCLK, HRESETn,
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input logic [PERIPHS-1:0] HSEL,
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input logic [PERIPHS-1:0] HSEL,
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input logic [P.PA_BITS-1:0] HADDR,
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input logic [P.PA_BITS-1:0] HADDR,
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input logic [P.XLEN-1:0] HWDATA,
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input logic [P.XLEN-1:0] HWDATA,
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input logic [P.XLEN/8-1:0] HWSTRB,
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input logic [P.XLEN/8-1:0] HWSTRB,
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input logic HWRITE,
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input logic HWRITE,
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input logic [1:0] HTRANS,
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input logic [1:0] HTRANS,
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input logic HREADY,
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input logic HREADY,
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// input logic [3:0] HPROT, // not used
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// input logic [3:0] HPROT, // not used
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output logic [P.XLEN-1:0] HRDATA,
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output logic [P.XLEN-1:0] HRDATA,
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output logic HRESP, HREADYOUT,
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output logic HRESP, HREADYOUT,
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output logic PCLK, PRESETn,
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output logic PCLK, PRESETn,
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output logic [PERIPHS-1:0] PSEL,
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output logic [PERIPHS-1:0] PSEL,
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output logic PWRITE,
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output logic PWRITE,
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output logic PENABLE,
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output logic PENABLE,
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output logic [31:0] PADDR,
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output logic [31:0] PADDR,
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output logic [P.XLEN-1:0] PWDATA,
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output logic [P.XLEN-1:0] PWDATA,
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// output logic [2:0] PPROT, // not used
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// output logic [2:0] PPROT, // not used
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output logic [P.XLEN/8-1:0] PSTRB,
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output logic [P.XLEN/8-1:0] PSTRB,
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// output logic PWAKEUP // not used
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// output logic PWAKEUP // not used
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input logic [PERIPHS-1:0] PREADY,
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input logic [PERIPHS-1:0] PREADY,
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input var [PERIPHS-1:0][P.XLEN-1:0] PRDATA
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input var [PERIPHS-1:0][P.XLEN-1:0] PRDATA
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);
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);
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@ -56,15 +56,15 @@ module ahbapbbridge import cvw::*; #(parameter cvw_t P,
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logic PREADYOUT;
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logic PREADYOUT;
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// convert AHB to APB signals
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// convert AHB to APB signals
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assign PCLK = HCLK;
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assign PCLK = HCLK;
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assign PRESETn = HRESETn;
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assign PRESETn = HRESETn;
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// identify start of a transaction
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// identify start of a transaction
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assign initTrans = HTRANS[1] & HREADY; // start a transaction when the bus is ready and an active transaction is requested
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assign initTrans = HTRANS[1] & HREADY; // start a transaction when the bus is ready and an active transaction is requested
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assign initTransSel = initTrans & |HSEL; // capture data and address if any of the peripherals are selected
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assign initTransSel = initTrans & |HSEL; // capture data and address if any of the peripherals are selected
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// delay AHB Address phase signals to align with AHB Data phase because APB expects them at the same time
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// delay AHB Address phase signals to align with AHB Data phase because APB expects them at the same time
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flopen #(32) addrreg(HCLK, HREADY, HADDR[31:0], PADDR);
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flopen #(32) addrreg(HCLK, HREADY, HADDR[31:0], PADDR);
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flopenr #(1) writereg(HCLK, ~HRESETn, HREADY, HWRITE, PWRITE);
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flopenr #(1) writereg(HCLK, ~HRESETn, HREADY, HWRITE, PWRITE);
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flopenr #(PERIPHS) selreg(HCLK, ~HRESETn, HREADY, HSEL & {PERIPHS{initTrans}}, PSEL);
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flopenr #(PERIPHS) selreg(HCLK, ~HRESETn, HREADY, HSEL & {PERIPHS{initTrans}}, PSEL);
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// PPROT[2:0] = {Data/InstrB, Secure, Privileged};
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// PPROT[2:0] = {Data/InstrB, Secure, Privileged};
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@ -73,7 +73,7 @@ module ahbapbbridge import cvw::*; #(parameter cvw_t P,
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// AHB Data phase signal doesn't need delay. Note that they are guaranteed to remain stable until READY is asserted
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// AHB Data phase signal doesn't need delay. Note that they are guaranteed to remain stable until READY is asserted
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assign PWDATA = HWDATA;
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assign PWDATA = HWDATA;
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assign PSTRB = HWSTRB;
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assign PSTRB = HWSTRB;
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// enable logic: goes high a cycle after initTrans, then back low on cycle after desired PREADY is asserted
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// enable logic: goes high a cycle after initTrans, then back low on cycle after desired PREADY is asserted
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// cycle1: AHB puts HADDR, HWRITE, HSEL on bus. initTrans is 1, and these are captured
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// cycle1: AHB puts HADDR, HWRITE, HSEL on bus. initTrans is 1, and these are captured
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@ -103,4 +103,3 @@ assign HREADYOUT = PREADYOUT & ~initTransSelD; // don't raise HREADYOUT before a
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// resp logic
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// resp logic
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assign HRESP = 0; // bridge never indicates errors
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assign HRESP = 0; // bridge never indicates errors
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endmodule
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endmodule
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