system-verilog

问题 In top.v, I generate X_MAX*Y_MAX instances of a pe module. In pe.v, I want to initialize a memory generated specifically for that instance. For example, at x=0,y=1: "pe_memory_x0_y0.dat". This is what my top-level module looks like: genvar x, y; generate for (y = 0; y < Y_MAX; y = y + 1) begin : ys for (x = 0; x < X_MAX; x = x + 1) begin : xs pe #( .X_MAX(X_MAX), .Y_MAX(Y_MAX), .X(x), .Y(y) ) pe_inst( .clk(clk), ... ); Inside pe.v, things like $display("Loading pe memory at (%0d,%0d)", X, Y);

来源： https://stackoverflow.com/questions/32778798/behavior-difference-between-always-comb-and-always

来源： https://stackoverflow.com/questions/32778798/behavior-difference-between-always-comb-and-always

来源： https://stackoverflow.com/questions/32778798/behavior-difference-between-always-comb-and-always

来源： https://stackoverflow.com/questions/64092936/what-is-the-proper-way-to-add-delays-to-eg-74hct151-verilog-model-so-it-is-ac

问题 SystemVerilog introduced some very useful constructs to improve coding style. However, as one of my coworkers always says, "You are not writing software, you are describing hardware." With that in mind, what features of the language should be avoided when the end result needs to be synthesized? This paper shows what features are currently synthesizable by the Synopsys tools, but to be safe I think one should only use the features that are synthesizable by all of the major vendors. Also, what

问题 SystemVerilog introduced some very useful constructs to improve coding style. However, as one of my coworkers always says, "You are not writing software, you are describing hardware." With that in mind, what features of the language should be avoided when the end result needs to be synthesized? This paper shows what features are currently synthesizable by the Synopsys tools, but to be safe I think one should only use the features that are synthesizable by all of the major vendors. Also, what

问题 SystemVerilog introduced some very useful constructs to improve coding style. However, as one of my coworkers always says, "You are not writing software, you are describing hardware." With that in mind, what features of the language should be avoided when the end result needs to be synthesized? This paper shows what features are currently synthesizable by the Synopsys tools, but to be safe I think one should only use the features that are synthesizable by all of the major vendors. Also, what

问题 I am totally confused among these 4 terms: always_ff , always_comb , always_latch and always . How and for what purpose can these be used? 回答1: always is the main type of process from Verilog, the other is an initial which is ran once at the start of a simulation. always_ff @(posedge clk) : Represents a flip-flop (ff), the process is triggered (executed) on every positive edge of the clock. This replaces always @(posedge clk) . This is the only type where non-blocking ( <= ) assignments

问题 Here is the example behavioral Verilog code in question module constant; reg [7:0] foo; initial begin foo = 1'bz; $display("%H", foo); end endmodule Icarus Verilog gave me $ iverilog -o constant constant.v $ ./constant 0Z However, according to this website (and the lecturer of an FPGA course I am taking), If number is smaller than the size constant, then it will be padded to the left with zeros. If the most significant bit of a specified number has an unknown (x) or high-impedance (z) value,