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[/] [uart6551/] [trunk/] [trunk/] [rtl/] [uart6551BaudLUT.sv] - Rev 2
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// ============================================================================
// __
// \\__/ o\ (C) 2005-2019 Robert Finch, Waterloo
// \ __ / All rights reserved.
// \/_// robfinch<remove>@finitron.ca
// ||
//
//
// This source file is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This source file is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// ============================================================================
//
module uart6551BaudLUT(a, o);
parameter pCounterBits = 24;
input [4:0] a;
output reg [pCounterBits-1:0] o;
// table for a 50.000MHz reference clock
// value = 50,000,000 / (baud * 16)
always @(a)
case (a) // synopsys full_case parallel_case
5'd0: o <= 0;
5'd1: o <= 24'd62500; // 50 baud
5'd2: o <= 24'd41667; // 75 baud
5'd3: o <= 24'd28617; // 109.92 baud
5'd4: o <= 24'd23220; // 134.58 baud
5'd5: o <= 24'd20833; // 150 baud
5'd6: o <= 24'd10417; // 300 baud
5'd7: o <= 24'd5208; // 600 baud
5'd8: o <= 24'd2604; // 1200 baud
5'd9: o <= 24'd1736; // 1800 baud
5'd10: o <= 24'd1302; // 2400 baud
5'd11: o <= 24'd868; // 3600 baud
5'd12: o <= 24'd651; // 4800 baud
5'd13: o <= 24'd434; // 7200 baud
5'd14: o <= 24'd326; // 9600 baud
5'd15: o <= 24'd163; // 19200 baud
5'd16: o <= 24'd81; // 38400 baud
5'd17: o <= 24'd54; // 57600 baud
5'd18: o <= 24'd27; // 115200 baud
5'd19: o <= 24'd14; // 230400 baud
5'd20: o <= 24'd7; // 460800 baud
5'd21: o <= 24'd3; // 921600 baud
default: o <= 24'd326; // 9600 baud
endcase
endmodule
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