lb_gateway.v

// Simple wrapper of mem_gateway.v
// Rename ports to get something more familiar to:
// - newad.py
// - picorv32 memory bus bridge
// - xilinx DRP bridge
// - potential axi-lite/wishbone bridge
module lb_gateway #(
    parameter n_lat        =8,
    parameter read_pipe_len=3
) (
    input         clk,   // timespec 6.8 ns
    // client interface with RTEFI, see doc/clients.eps
    input  [10:0] len_c,
    input  [ 7:0] idata,
    input         raw_l,
    input         raw_s,
    output [ 7:0] odata,
    // local bus master
    output        lb_clk,
    output [23:0] lb_addr,
    output        lb_write,
    output        lb_read,
    output        lb_rvalid,
    output        lb_pre_rvalid,
    output [31:0] lb_wdata,
    input  [31:0] lb_rdata
);

wire control_strobe, control_rd;
wire [read_pipe_len:0] control_pipe_rd;

mem_gateway #(
    .n_lat          (n_lat),
    .read_pipe_len  (read_pipe_len)
) mem_gateway_i (
    .clk             (clk),
    .len_c           (len_c),
    .idata           (idata),
    .raw_l           (raw_l),
    .raw_s           (raw_s),
    .odata           (odata),
    .addr            (lb_addr),
    .control_strobe  (control_strobe),
    .control_rd      (control_rd),
    .control_rd_valid(lb_rvalid),
    .control_pipe_rd (control_pipe_rd),
    .data_out        (lb_wdata),
    .data_in         (lb_rdata)
);

assign lb_clk    = clk;
assign lb_write  = control_strobe & ~control_rd;
assign lb_read   = |control_pipe_rd;
assign lb_pre_rvalid = control_pipe_rd[read_pipe_len-1];

endmodule