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Add BRAM (PDPSC16K) memory inference example for lifcl-40-evn[g] board. #41

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Add BRAM (PDPSC16K) memory inference example for lifcl-40-evn[g] board. #41

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5e79cdc
add bram example (for lifcl-40-evn[g] board)
May 25, 2023
c1e65bb
use switches as address for bram
May 25, 2023
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6 changes: 6 additions & 0 deletions examples/bram_evn/Makefile
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PROJ=bram
DEVICE=LIFCL-40-8BG400C
PDC=evn.pdc

include ../common.mk

310 changes: 310 additions & 0 deletions examples/bram_evn/bram.v
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// Simple bram example for the LIFCL-40-EVN board
// Use switches to set RAM write data (`w_data`)
// pushbutton 0 ("PBO") writes to BRAM
// pushbutton 1 ("PB1") reads from BRAM onto leds

// How to verify BRAM is used?
// Can check for PDPSC16K in e.g.
// 1. bram.json
// 2. nextpnr-nexus output
// 2. `show` in yosys (after `synth_nexus`)

module top(input clk,
input [7:0] sw,
input [1:0] button,
output [13:0] led);

//// //// //// //// RAM
localparam RAM_WIDTH = 8;
localparam RAM_DEPTH = 256;
localparam ADDR_WIDTH = 8;
reg [(RAM_WIDTH-1):0] ram [0:(RAM_DEPTH-1)];
wire [(RAM_WIDTH-1):0] w_data;
reg [(RAM_WIDTH-1):0] r_data;
wire [(ADDR_WIDTH-1):0] w_addr;
wire [(ADDR_WIDTH-1):0] r_addr;
wire w_en;
wire r_en;
always @(posedge clk) begin
if (w_en) begin
ram[w_addr] <= w_data;
end
end
always @(posedge clk) begin
if (r_en)
r_data <= ram[r_addr];
end
//// //// //// //// RAM

//// LIFCL-40-EVN Assignments
assign w_en = ~button[0];
assign r_en = ~button[1];
assign w_data = sw;
assign led[13:RAM_WIDTH] = {14-RAM_WIDTH{1'b1}};
assign led[RAM_WIDTH-1:0] = ~(w_en ? sw : r_data);
assign w_addr = sw;
assign r_addr = sw;

//// //// //// //// RAM
initial begin
ram[0] = 8'd0;
ram[1] = 8'd0;
ram[2] = 8'd0;
ram[3] = 8'd0;
ram[4] = 8'd0;
ram[5] = 8'd0;
ram[6] = 8'd0;
ram[7] = 8'd0;
ram[8] = 8'd0;
ram[9] = 8'd0;
ram[10] = 8'd0;
ram[11] = 8'd0;
ram[12] = 8'd0;
ram[13] = 8'd0;
ram[14] = 8'd0;
ram[15] = 8'd0;
ram[16] = 8'd0;
ram[17] = 8'd0;
ram[18] = 8'd0;
ram[19] = 8'd0;
ram[20] = 8'd0;
ram[21] = 8'd0;
ram[22] = 8'd0;
ram[23] = 8'd0;
ram[24] = 8'd0;
ram[25] = 8'd0;
ram[26] = 8'd0;
ram[27] = 8'd0;
ram[28] = 8'd0;
ram[29] = 8'd0;
ram[30] = 8'd0;
ram[31] = 8'd0;
ram[32] = 8'd0;
ram[33] = 8'd0;
ram[34] = 8'd0;
ram[35] = 8'd0;
ram[36] = 8'd0;
ram[37] = 8'd0;
ram[38] = 8'd0;
ram[39] = 8'd0;
ram[40] = 8'd0;
ram[41] = 8'd0;
ram[42] = 8'd0;
ram[43] = 8'd0;
ram[44] = 8'd0;
ram[45] = 8'd0;
ram[46] = 8'd0;
ram[47] = 8'd0;
ram[48] = 8'd0;
ram[49] = 8'd0;
ram[50] = 8'd0;
ram[51] = 8'd0;
ram[52] = 8'd0;
ram[53] = 8'd0;
ram[54] = 8'd0;
ram[55] = 8'd0;
ram[56] = 8'd0;
ram[57] = 8'd0;
ram[58] = 8'd0;
ram[59] = 8'd0;
ram[60] = 8'd0;
ram[61] = 8'd0;
ram[62] = 8'd0;
ram[63] = 8'd0;
ram[64] = 8'd0;
ram[65] = 8'd0;
ram[66] = 8'd0;
ram[67] = 8'd0;
ram[68] = 8'd0;
ram[69] = 8'd0;
ram[70] = 8'd0;
ram[71] = 8'd0;
ram[72] = 8'd0;
ram[73] = 8'd0;
ram[74] = 8'd0;
ram[75] = 8'd0;
ram[76] = 8'd0;
ram[77] = 8'd0;
ram[78] = 8'd0;
ram[79] = 8'd0;
ram[80] = 8'd0;
ram[81] = 8'd0;
ram[82] = 8'd0;
ram[83] = 8'd0;
ram[84] = 8'd0;
ram[85] = 8'd0;
ram[86] = 8'd0;
ram[87] = 8'd0;
ram[88] = 8'd0;
ram[89] = 8'd0;
ram[90] = 8'd0;
ram[91] = 8'd0;
ram[92] = 8'd0;
ram[93] = 8'd0;
ram[94] = 8'd0;
ram[95] = 8'd0;
ram[96] = 8'd0;
ram[97] = 8'd0;
ram[98] = 8'd0;
ram[99] = 8'd0;
ram[100] = 8'd0;
ram[101] = 8'd0;
ram[102] = 8'd0;
ram[103] = 8'd0;
ram[104] = 8'd0;
ram[105] = 8'd0;
ram[106] = 8'd0;
ram[107] = 8'd0;
ram[108] = 8'd0;
ram[109] = 8'd0;
ram[110] = 8'd0;
ram[111] = 8'd0;
ram[112] = 8'd0;
ram[113] = 8'd0;
ram[114] = 8'd0;
ram[115] = 8'd0;
ram[116] = 8'd0;
ram[117] = 8'd0;
ram[118] = 8'd0;
ram[119] = 8'd0;
ram[120] = 8'd0;
ram[121] = 8'd0;
ram[122] = 8'd0;
ram[123] = 8'd0;
ram[124] = 8'd0;
ram[125] = 8'd0;
ram[126] = 8'd0;
ram[127] = 8'd0;
ram[128] = 8'd0;
ram[129] = 8'd0;
ram[130] = 8'd0;
ram[131] = 8'd0;
ram[132] = 8'd0;
ram[133] = 8'd0;
ram[134] = 8'd0;
ram[135] = 8'd0;
ram[136] = 8'd0;
ram[137] = 8'd0;
ram[138] = 8'd0;
ram[139] = 8'd0;
ram[140] = 8'd0;
ram[141] = 8'd0;
ram[142] = 8'd0;
ram[143] = 8'd0;
ram[144] = 8'd0;
ram[145] = 8'd0;
ram[146] = 8'd0;
ram[147] = 8'd0;
ram[148] = 8'd0;
ram[149] = 8'd0;
ram[150] = 8'd0;
ram[151] = 8'd0;
ram[152] = 8'd0;
ram[153] = 8'd0;
ram[154] = 8'd0;
ram[155] = 8'd0;
ram[156] = 8'd0;
ram[157] = 8'd0;
ram[158] = 8'd0;
ram[159] = 8'd0;
ram[160] = 8'd0;
ram[161] = 8'd0;
ram[162] = 8'd0;
ram[163] = 8'd0;
ram[164] = 8'd0;
ram[165] = 8'd0;
ram[166] = 8'd0;
ram[167] = 8'd0;
ram[168] = 8'd0;
ram[169] = 8'd0;
ram[170] = 8'd0;
ram[171] = 8'd0;
ram[172] = 8'd0;
ram[173] = 8'd0;
ram[174] = 8'd0;
ram[175] = 8'd0;
ram[176] = 8'd0;
ram[177] = 8'd0;
ram[178] = 8'd0;
ram[179] = 8'd0;
ram[180] = 8'd0;
ram[181] = 8'd0;
ram[182] = 8'd0;
ram[183] = 8'd0;
ram[184] = 8'd0;
ram[185] = 8'd0;
ram[186] = 8'd0;
ram[187] = 8'd0;
ram[188] = 8'd0;
ram[189] = 8'd0;
ram[190] = 8'd0;
ram[191] = 8'd0;
ram[192] = 8'd0;
ram[193] = 8'd0;
ram[194] = 8'd0;
ram[195] = 8'd0;
ram[196] = 8'd0;
ram[197] = 8'd0;
ram[198] = 8'd0;
ram[199] = 8'd0;
ram[200] = 8'd0;
ram[201] = 8'd0;
ram[202] = 8'd0;
ram[203] = 8'd0;
ram[204] = 8'd0;
ram[205] = 8'd0;
ram[206] = 8'd0;
ram[207] = 8'd0;
ram[208] = 8'd0;
ram[209] = 8'd0;
ram[210] = 8'd0;
ram[211] = 8'd0;
ram[212] = 8'd0;
ram[213] = 8'd0;
ram[214] = 8'd0;
ram[215] = 8'd0;
ram[216] = 8'd0;
ram[217] = 8'd0;
ram[218] = 8'd0;
ram[219] = 8'd0;
ram[220] = 8'd0;
ram[221] = 8'd0;
ram[222] = 8'd0;
ram[223] = 8'd0;
ram[224] = 8'd0;
ram[225] = 8'd0;
ram[226] = 8'd0;
ram[227] = 8'd0;
ram[228] = 8'd0;
ram[229] = 8'd0;
ram[230] = 8'd0;
ram[231] = 8'd0;
ram[232] = 8'd0;
ram[233] = 8'd0;
ram[234] = 8'd0;
ram[235] = 8'd0;
ram[236] = 8'd0;
ram[237] = 8'd0;
ram[238] = 8'd0;
ram[239] = 8'd0;
ram[240] = 8'd0;
ram[241] = 8'd0;
ram[242] = 8'd0;
ram[243] = 8'd0;
ram[244] = 8'd0;
ram[245] = 8'd0;
ram[246] = 8'd0;
ram[247] = 8'd0;
ram[248] = 8'd0;
ram[249] = 8'd0;
ram[250] = 8'd0;
ram[251] = 8'd0;
ram[252] = 8'd0;
ram[253] = 8'd0;
ram[254] = 8'd0;
ram[255] = 8'd0;
end
//// //// //// //// RAM

endmodule

53 changes: 53 additions & 0 deletions examples/bram_evn/evn.pdc
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ldc_set_location -site {E17} [get_ports {led[0]}]
ldc_set_location -site {F13} [get_ports {led[1]}]
ldc_set_location -site {G13} [get_ports {led[2]}]
ldc_set_location -site {F14} [get_ports {led[3]}]
ldc_set_location -site {L16} [get_ports {led[4]}]
ldc_set_location -site {L15} [get_ports {led[5]}]
ldc_set_location -site {L20} [get_ports {led[6]}]
ldc_set_location -site {L19} [get_ports {led[7]}]
ldc_set_location -site {R17} [get_ports {led[8]}]
ldc_set_location -site {R18} [get_ports {led[9]}]
ldc_set_location -site {U20} [get_ports {led[10]}]
ldc_set_location -site {T20} [get_ports {led[11]}]
ldc_set_location -site {W20} [get_ports {led[12]}]
ldc_set_location -site {V20} [get_ports {led[13]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {led[0]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {led[1]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {led[2]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {led[3]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {led[4]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {led[5]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {led[6]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {led[7]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {led[8]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {led[9]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {led[10]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {led[11]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {led[12]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {led[13]}]

ldc_set_location -site {L13} [get_ports clk]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {clk}]

ldc_set_location -site {G14} [get_ports {button[0]}]
ldc_set_location -site {G15} [get_ports {button[1]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {button[0]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {button[1]}]

ldc_set_location -site {N14} [get_ports {sw[0]}]
ldc_set_location -site {M14} [get_ports {sw[1]}]
ldc_set_location -site {M16} [get_ports {sw[2]}]
ldc_set_location -site {M15} [get_ports {sw[3]}]
ldc_set_location -site {N15} [get_ports {sw[4]}]
ldc_set_location -site {N16} [get_ports {sw[5]}]
ldc_set_location -site {M17} [get_ports {sw[6]}]
ldc_set_location -site {M18} [get_ports {sw[7]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {sw[0]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {sw[1]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {sw[2]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {sw[3]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {sw[4]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {sw[5]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {sw[6]}]
ldc_set_port -iobuf {IO_TYPE=LVCMOS33} [get_ports {sw[7]}]