ACP接口的Verilog代码

ACP（Accelerated Coherency Port）是一个高速、低延迟的接口，用于连接处理器、DMA和其他外设。以下是一个简单的ACP接口的Verilog代码示例：

module acp_interface(
  input  clk,
  input  reset,

  // ACP Master signals
  output [31:0] acp_mstr_addr,
  output [31:0] acp_mstr_wdata,
  input  [31:0] acp_mstr_rdata,
  output        acp_mstr_wr,
  output        acp_mstr_rd,
  output        acp_mstr_burst,
  output        acp_mstr_size,
  output        acp_mstr_lock,
  output        acp_mstr_cache,
  output        acp_mstr_prot,
  output        acp_mstr_qos,
  output        acp_mstr_id,

  // ACP Slave signals
  input  [31:0] acp_slv_addr,
  input  [31:0] acp_slv_wdata,
  output [31:0] acp_slv_rdata,
  input         acp_slv_wr,
  input         acp_slv_rd,
  input         acp_slv_burst,
  input         acp_slv_size,
  input         acp_slv_lock,
  input         acp_slv_cache,
  input         acp_slv_prot,
  input         acp_slv_qos,
  input         acp_slv_id
);

  // ACP Master FSM
  reg [2:0] acp_mstr_state;
  reg [3:0] acp_mstr_cnt;

  // ACP Slave FSM
  reg [2:0] acp_slv_state;
  reg [3:0] acp_slv_cnt;

  // ACP Slave memory
  reg [31:0] acp_slv_mem [0:1023]; // 4KB memory

  // ACP Master states
  parameter ACP_MSTR_IDLE   = 3'd0;
  parameter ACP_MSTR_ADDR   = 3'd1;
  parameter ACP_MSTR_WRDATA = 3'd2;
  parameter ACP_MSTR_RDDATA = 3'd3;

  // ACP Slave states
  parameter ACP_SLV_IDLE   = 3'd0;
  parameter ACP_SLV_ADDR   = 3'd1;
  parameter ACP_SLV_WRDATA = 3'd2;
  parameter ACP_SLV_RDDATA = 3'd3;

  always @(posedge clk) begin
    if (reset) begin
      acp_mstr_state <= ACP_MSTR_IDLE;
      acp_mstr_cnt   <= 0;
      acp_slv_state  <= ACP_SLV_IDLE;
      acp_slv_cnt    <= 0;
    end else begin
      // ACP Master FSM
      case (acp_mstr_state)
        ACP_MSTR_IDLE: begin
          if (acp_mstr_wr || acp_mstr_rd) begin
            acp_mstr_state <= ACP_MSTR_ADDR;
            acp_mstr_cnt   <= 0;
          end
        end
        ACP_MSTR_ADDR: begin
          if (acp_mstr_cnt == 1) begin
            acp_mstr_state <= ACP_MSTR_WRDATA;
            acp_mstr_cnt   <= 0;
          end else begin
            acp_mstr_cnt <= acp_mstr_cnt + 1;
          end
        end
        ACP_MSTR_WRDATA: begin
          if (acp_mstr_cnt == 1) begin
            acp_mstr_state <= ACP_MSTR_IDLE;
            acp_mstr_cnt   <= 0;
          end else begin
            acp_mstr_cnt <= acp_mstr_cnt + 1;
          end
        end
        ACP_MSTR_RDDATA: begin
          if (acp_mstr_cnt == 1) begin
            acp_mstr_state <= ACP_MSTR_IDLE;
            acp_mstr_cnt   <= 0;
          end else begin
            acp_mstr_cnt <= acp_mstr_cnt + 1;
          end
        end
      endcase

      // ACP Slave FSM
      case (acp_slv_state)
        ACP_SLV_IDLE: begin
          if (acp_slv_wr || acp_slv_rd) begin
            acp_slv_state <= ACP_SLV_ADDR;
            acp_slv_cnt   <= 0;
          end
        end
        ACP_SLV_ADDR: begin
          if (acp_slv_cnt == 1) begin
            acp_slv_state <= ACP_SLV_WRDATA;
            acp_slv_cnt   <= 0;
          end else begin
            acp_slv_cnt <= acp_slv_cnt + 1;
          end
        end
        ACP_SLV_WRDATA: begin
          if (acp_slv_cnt == 1) begin
            acp_slv_state <= ACP_SLV_IDLE;
            acp_slv_cnt   <= 0;
            if (acp_slv_wr) begin
              acp_slv_mem[acp_slv_addr >> 2] <= acp_slv_wdata;
            end
          end else begin
            acp_slv_cnt <= acp_slv_cnt + 1;
          end
        end
        ACP_SLV_RDDATA: begin
          if (acp_slv_cnt == 1) begin
            acp_slv_state <= ACP_SLV_IDLE;
            acp_slv_cnt   <= 0;
            if (acp_slv_rd) begin
              acp_slv_rdata <= acp_slv_mem[acp_slv_addr >> 2];
            end
          end else begin
            acp_slv_cnt <= acp_slv_cnt + 1;
          end
        end
      endcase
    end
  end

  // ACP Master signals
  assign acp_mstr_burst = 2'b01; // Incrementing burst
  assign acp_mstr_size  = 2'b10; // 4-byte transfer
  assign acp_mstr_lock  = 1'b0;  // No locking
  assign acp_mstr_cache = 4'b0000; // Non-cacheable
  assign acp_mstr_prot  = 3'b000;  // Normal memory
  assign acp_mstr_qos   = 4'b0000; // Default QoS
  assign acp_mstr_id    = 8'h00;  // Default ID

endmodule

该代码示例包括ACP主机和从机的状态机代码，并包含用于读取和写入从机内存的逻辑。在实际系统中，ACP接口的信号数量和功能可能会有所不同，具体取决于系统设计的需求。