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// ============================================================================
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// ============================================================================
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// (C) 2007,2011,2013 Robert Finch
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// (C) 2007,2011,2013,2015 Robert Finch
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// All rights reserved.
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// All rights reserved.
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// robfinch@<remove>finitron.ca
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// robfinch@<remove>finitron.ca
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//
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//
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// rtfSimpleUart.v
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// rtfSimpleUart.v
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// Basic uart with baud rate generator based on a harmonic
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// Basic uart with baud rate generator based on a harmonic
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input dsr_ni, // data set ready - active low
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input dsr_ni, // data set ready - active low
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input dcd_ni, // data carrier detect - active low
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input dcd_ni, // data carrier detect - active low
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output reg dtr_no, // data terminal ready - active low
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output reg dtr_no, // data terminal ready - active low
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input rxd_i, // serial data in
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input rxd_i, // serial data in
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output txd_o, // serial data out
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output txd_o, // serial data out
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output data_present_o
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output data_present_o,
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//----------------
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output baud16_clk
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);
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);
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parameter pClkFreq = 20000000; // clock frequency in MHz
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parameter pClkFreq = 20000000; // clock frequency in MHz
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parameter pBaud = 19200;
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parameter pBaud = 19200;
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parameter pClkMul = (4096 * pBaud) / (pClkFreq / 65536);
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parameter pClkMul = (4096 * pBaud) / (pClkFreq / 65536);
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parameter pRts = 1; // default to active
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parameter pRts = 1; // default to active
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assign irq_o =
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assign irq_o =
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rxIRQ
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rxIRQ
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| txIRQ
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| txIRQ
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| msIRQ
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| msIRQ
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;
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;
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assign baud16_clk = baud16;
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wire [2:0] irqenc =
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wire [2:0] irqenc =
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rxIRQ ? 1 :
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rxIRQ ? 1 :
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txIRQ ? 3 :
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txIRQ ? 3 :
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msIRQ ? 4 :
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msIRQ ? 4 :
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