Code examples in this text refer to explicit state models exclusively. How to capture a finite state machine The restriction to explicit state models notwithstanding, one still has the choice of packing an FSM
With most synthesizers, setting a register's initial value is quite simple: Use Verilog's "initial": reg [15:0] counter; initial counter = 1000; It may come as a surprise that "initial" can be used in Verilog code for synthesis, but as it turns out, this usage is widely supported....
always @(posedge clk or negedge rst_n) if (!rst_n) {co,q} <= 9'b0; // async reset else if (ld) {co,q} <= d; // sync load else {co,q} <= q + 1'b1; // sync increment endmodule Example 7a- Verilog code for a loadable counter with asynchronous reset library ieee; use...
That is a simply counter that continuously count up to 255 and so send 0,1,2..,254,255,0,1,2...,254,255 to pc and in SDC file I have set these constraints: create_clock -name "FT_CLK" -period 16.67ns set_input_delay -clock { FT_CLK } -min 9ns nTXE set_inp...
I think most synthesizers will pick up "x <= (x + 1) mod 255;" as the correct operation. the type might not be inferred from that, but from the "signal x : integer range 0 to 255;" line. gray code doesn't make too much sense unless you have async clock domains. FPGA's have...
Asynchronous Synchronous Reset Design (异步和同步复位的设计).pdf,Asynchronous Synchronous Reset Design Techniques - Part Deux Clifford E. Cummings Don Mills Steve Golson Sunburst Design, Inc. LCDM Engineering Trilobyte Systems cliffc@ mills@ sgolson@ A
That is a simply counter that continuously count up to 255 and so send 0,1,2..,254,255,0,1,2...,254,255 to pc and in SDC file I have set these constraints: create_clock -name "FT_CLK" -period 16.67ns set_input_delay -clock { FT_CLK } -min 9ns nTXE set_input_delay ...
That is a simply counter that continuously count up to 255 and so send 0,1,2..,254,255,0,1,2...,254,255 to pc and in SDC file I have set these constraints: create_clock -name "FT_CLK" -period 16.67ns set_input_delay -clock { FT_CLK } -min 9ns nTXE set_input_delay ...
That is a simply counter that continuously count up to 255 and so send 0,1,2..,254,255,0,1,2...,254,255 to pc and in SDC file I have set these constraints: create_clock -name "FT_CLK" -period 16.67ns set_input_delay -clock { FT_CLK } -min 9ns nTXE set_in...
In an alternative embodiment, a finite state machine is used in place of the saturating counter. Pseudo-Verilog for such an implementation is shown below. assign p_done = p_cnt == P; assign o_rstn = sync_rstn; assign cg_en = p_done; @always(posedge i_clk or negedge sync_rstn) ...