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URL https://opencores.org/ocsvn/amber/amber/trunk

Subversion Repositories amber

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  • This comparison shows the changes necessary to convert path 
    /amber
    from Rev 12 to Rev 13
    ↔ Reverse comparison
  •

Rev 12 → Rev 13

/trunk/hw/vlog/system/uart.v
53,6 → 53,11
 
`include "system_config_defines.v"
 
// Normally AMBER_UART_BAUD is defined in the system_config_defines.v file.
`ifndef AMBER_UART_BAUD
`define AMBER_UART_BAUD 230400
`endif
 
module uart (
input i_clk,
 
93,18 → 98,19
TXD_STOP2 = 4'd11,
TXD_STOP3 = 4'd12;
localparam [3:0] RXD_IDLE = 4'd0,
RXD_START = 4'd1,
RXD_START_MID = 4'd2,
RXD_DATA0 = 4'd3,
RXD_DATA1 = 4'd4,
RXD_DATA2 = 4'd5,
RXD_DATA3 = 4'd6,
RXD_DATA4 = 4'd7,
RXD_DATA5 = 4'd8,
RXD_DATA6 = 4'd9,
RXD_DATA7 = 4'd10,
RXD_STOP = 4'd11;
localparam [3:0] RXD_IDLE = 4'd0,
RXD_START = 4'd1,
RXD_START_MID = 4'd2,
RXD_START_MID1 = 4'd3,
RXD_DATA0 = 4'd4,
RXD_DATA1 = 4'd5,
RXD_DATA2 = 4'd6,
RXD_DATA3 = 4'd7,
RXD_DATA4 = 4'd8,
RXD_DATA5 = 4'd9,
RXD_DATA6 = 4'd10,
RXD_DATA7 = 4'd11,
RXD_STOP = 4'd12;
 
 
localparam RX_INTERRUPT_COUNT = 24'h3fffff;
116,7 → 122,13
 
`ifndef Veritak
localparam real UART_BAUD = `AMBER_UART_BAUD; // Hz
 
`ifdef XILINX_VIRTEX6_FPGA
localparam real CLK_FREQ = 1000.0 / `AMBER_CLK_DIVIDER ; // MHz
`else
localparam real CLK_FREQ = 800.0 / `AMBER_CLK_DIVIDER ; // MHz
`endif
 
localparam real UART_BIT_PERIOD = 1000000000 / UART_BAUD; // nS
localparam real UART_WORD_PERIOD = ( UART_BIT_PERIOD * 12 ); // nS
localparam real CLK_PERIOD = 1000 / CLK_FREQ; // nS
327,9 → 339,9
 
assign o_uart_txd = txd;
 
assign tx_fifo_full = fifo_enable ? tx_fifo_count >= 5'd16 : tx_fifo_full_flag;
assign tx_fifo_empty = fifo_enable ? tx_fifo_count == 5'd00 : !tx_fifo_full_flag;
assign tx_fifo_half_or_less_full = tx_fifo_count <= 5'd8;
assign tx_fifo_full = fifo_enable ? tx_fifo_count >= 5'd16 : tx_fifo_full_flag;
assign tx_fifo_empty = fifo_enable ? tx_fifo_count == 5'd00 : !tx_fifo_full_flag;
assign tx_fifo_half_or_less_full = tx_fifo_count <= 5'd8;
assign tx_byte = fifo_enable ? tx_fifo[tx_fifo_rp[3:0]] : tx_fifo[0] ;
 
assign tx_fifo_push = wb_start_write && i_wb_adr[15:0] == AMBER_UART_DR;
423,7 → 435,7
always @( posedge i_clk )
if ( tx_bit_pulse )
case (txd_state)
case ( txd_state )
TXD_IDLE :
begin
565,11 → 577,17
// Filter out glitches and jaggedy transitions
if ( rx_start )
begin
rxd_state <= RXD_START_MID;
rxd_state <= RXD_START_MID1;
restart_rx_bit_count <= 1'd1;
end
else
restart_rx_bit_count <= 1'd0;
 
// This state just delays the check on the
// rx_bit_pulse_count value by 1 clock cycle to
// give it time to reset
RXD_START_MID1 :
rxd_state <= RXD_START_MID;
RXD_START_MID :
if ( rx_bit_pulse_count == RX_HALFPULSE_COUNT )
915,34 → 933,35
wire [(14*8)-1:0] xRXD_STATE;
 
assign xTXD_STATE = txd_state == TXD_IDLE ? "TXD_IDLE" :
txd_state == TXD_START ? "TXD_START" :
txd_state == TXD_DATA0 ? "TXD_DATA0" :
txd_state == TXD_DATA1 ? "TXD_DATA1" :
txd_state == TXD_DATA2 ? "TXD_DATA2" :
txd_state == TXD_DATA3 ? "TXD_DATA3" :
txd_state == TXD_DATA4 ? "TXD_DATA4" :
txd_state == TXD_DATA5 ? "TXD_DATA5" :
txd_state == TXD_DATA6 ? "TXD_DATA6" :
txd_state == TXD_DATA7 ? "TXD_DATA7" :
txd_state == TXD_STOP1 ? "TXD_STOP1" :
txd_state == TXD_STOP2 ? "TXD_STOP2" :
txd_state == TXD_STOP3 ? "TXD_STOP3" :
"UNKNOWN" ;
assign xTXD_STATE = txd_state == TXD_IDLE ? "TXD_IDLE" :
txd_state == TXD_START ? "TXD_START" :
txd_state == TXD_DATA0 ? "TXD_DATA0" :
txd_state == TXD_DATA1 ? "TXD_DATA1" :
txd_state == TXD_DATA2 ? "TXD_DATA2" :
txd_state == TXD_DATA3 ? "TXD_DATA3" :
txd_state == TXD_DATA4 ? "TXD_DATA4" :
txd_state == TXD_DATA5 ? "TXD_DATA5" :
txd_state == TXD_DATA6 ? "TXD_DATA6" :
txd_state == TXD_DATA7 ? "TXD_DATA7" :
txd_state == TXD_STOP1 ? "TXD_STOP1" :
txd_state == TXD_STOP2 ? "TXD_STOP2" :
txd_state == TXD_STOP3 ? "TXD_STOP3" :
"UNKNOWN" ;
 
assign xRXD_STATE = rxd_state == RXD_IDLE ? "RXD_IDLE" :
rxd_state == RXD_START ? "RXD_START" :
rxd_state == RXD_START_MID ? "RXD_START_MID" :
rxd_state == RXD_DATA0 ? "RXD_DATA0" :
rxd_state == RXD_DATA1 ? "RXD_DATA1" :
rxd_state == RXD_DATA2 ? "RXD_DATA2" :
rxd_state == RXD_DATA3 ? "RXD_DATA3" :
rxd_state == RXD_DATA4 ? "RXD_DATA4" :
rxd_state == RXD_DATA5 ? "RXD_DATA5" :
rxd_state == RXD_DATA6 ? "RXD_DATA6" :
rxd_state == RXD_DATA7 ? "RXD_DATA7" :
rxd_state == RXD_STOP ? "RXD_STOP" :
"UNKNOWN" ;
assign xRXD_STATE = rxd_state == RXD_IDLE ? "RXD_IDLE" :
rxd_state == RXD_START ? "RXD_START" :
rxd_state == RXD_START_MID1 ? "RXD_START_MID1":
rxd_state == RXD_START_MID ? "RXD_START_MID" :
rxd_state == RXD_DATA0 ? "RXD_DATA0" :
rxd_state == RXD_DATA1 ? "RXD_DATA1" :
rxd_state == RXD_DATA2 ? "RXD_DATA2" :
rxd_state == RXD_DATA3 ? "RXD_DATA3" :
rxd_state == RXD_DATA4 ? "RXD_DATA4" :
rxd_state == RXD_DATA5 ? "RXD_DATA5" :
rxd_state == RXD_DATA6 ? "RXD_DATA6" :
rxd_state == RXD_DATA7 ? "RXD_DATA7" :
rxd_state == RXD_STOP ? "RXD_STOP" :
"UNKNOWN" ;
 
//synopsys translate_on
 

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