| Line 51... |
Line 51... |
//
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//
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//
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//
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module toplevel(i_clk_8mhz,
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module toplevel(i_clk_8mhz,
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o_qspi_cs_n, o_qspi_sck, io_qspi_dat,
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o_qspi_cs_n, o_qspi_sck, io_qspi_dat,
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i_btn, o_led, o_pwm, o_pwm_shutdown_n, o_pwm_gain,
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i_btn, o_led, o_pwm, o_pwm_shutdown_n, o_pwm_gain,
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i_uart, o_uart, o_uart_cts, i_uart_rts,
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i_uart, o_uart, o_uart_rts_n, i_uart_cts_n,
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i_kp_row, o_kp_col,
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i_kp_row, o_kp_col,
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i_gpio, o_gpio,
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i_gpio, o_gpio,
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io_scl, io_sda);
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io_scl, io_sda);
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input i_clk_8mhz;
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input i_clk_8mhz;
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//
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//
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| Line 71... |
Line 71... |
//
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//
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// and our serial port
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// and our serial port
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input i_uart;
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input i_uart;
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output wire o_uart;
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output wire o_uart;
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// and it's associated control wires
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// and it's associated control wires
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output wire o_uart_cts;
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output wire o_uart_rts_n;
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input i_uart_rts;
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input i_uart_cts_n;
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// Our keypad
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// Our keypad
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input [3:0] i_kp_row;
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input [3:0] i_kp_row;
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output wire [3:0] o_kp_col;
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output wire [3:0] o_kp_col;
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// and our GPIO
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// and our GPIO
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input [15:2] i_gpio;
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input [15:2] i_gpio;
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| Line 112... |
Line 112... |
.CLKFB(ck_zero_0),
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.CLKFB(ck_zero_0),
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.CLKFX(clk_s),
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.CLKFX(clk_s),
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.PSEN(1'b0),
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.PSEN(1'b0),
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.RST(1'b0));
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.RST(1'b0));
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//
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// Baud rate is set by clock rate / baud rate desired. Thus,
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// The UART serial interface
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// 80 MHz / 9600 Baud = 8333, or about 0x208d. We choose a slow
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//
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// speed such as 9600 Baud to help the CPU keep up with the serial
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// Perhaps this should be part of our simulation model as well.
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// port rate.
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// For historical reasons, internal to Gisselquist Technology,
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localparam [30:0] UART_SETUP = 31'h4000208d;
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// this has remained separate from the simulation, allowing the
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// simulation to bypass whether or not these two functions work.
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//
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wire rx_stb, tx_stb;
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wire [7:0] rx_data, tx_data;
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wire tx_busy;
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wire [29:0] uart_setup;
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wire reset_s;
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assign reset_s = 1'b0;
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wire rx_break, rx_parity_err, rx_frame_err, rx_ck_uart, tx_break;
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assign tx_break = 1'b0;
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rxuart rcvuart(clk_s, 1'b0, uart_setup,
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i_uart, rx_stb, rx_data,
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rx_break, rx_parity_err, rx_frame_err, rx_ck_uart);
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txuart tcvuart(clk_s, reset_s, uart_setup, tx_break, tx_stb, tx_data,
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o_uart, tx_busy);
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//
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//
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// BUSMASTER
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// BUSMASTER
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//
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//
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// Busmaster is so named because it contains the wishbone
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// Busmaster is so named because it contains the wishbone
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| Line 150... |
Line 131... |
//
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//
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wire [3:0] qspi_dat;
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wire [3:0] qspi_dat;
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wire [1:0] qspi_bmod;
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wire [1:0] qspi_bmod;
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wire [15:0] w_gpio;
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wire [15:0] w_gpio;
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busmaster masterbus(clk_s, 1'b0,
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wire w_uart_rts_n;
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// External ... bus control (if enabled)
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busmaster #(.UART_SETUP(UART_SETUP))
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rx_stb, rx_data, tx_stb, tx_data, tx_busy, w_uart_cts,
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masterbus(clk_s, 1'b0,
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// Serial port wires
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i_uart, o_uart_rts_n, o_uart, i_uart_cts_n,
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// SPI/SD-card flash
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// SPI/SD-card flash
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o_qspi_cs_n, o_qspi_sck, qspi_dat, io_qspi_dat, qspi_bmod,
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o_qspi_cs_n, o_qspi_sck, qspi_dat, io_qspi_dat, qspi_bmod,
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// Board lights and switches
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// Board lights and switches
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i_btn, o_led, o_pwm, { o_pwm_shutdown_n, o_pwm_gain },
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i_btn, o_led, o_pwm, { o_pwm_shutdown_n, o_pwm_gain },
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// Keypad connections
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// Keypad connections
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i_kp_row, o_kp_col,
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i_kp_row, o_kp_col,
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// UART control
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uart_setup,
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// GPIO lines
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// GPIO lines
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{ i_gpio, io_scl, io_sda }, w_gpio
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{ i_gpio, io_scl, io_sda }, w_gpio
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);
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);
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assign o_uart_cts = (w_uart_cts)&&(i_uart_rts);
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//
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//
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// Quad SPI support
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// Quad SPI support
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//
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//
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// Supporting a Quad SPI port requires knowing which direction the
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// Supporting a Quad SPI port requires knowing which direction the
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