FreeCalypso > hg > fc-sim-sniff
view fpga/sniffer-pps/top.v @ 46:43f678895a3a
simtrace3-sniff-rx: add some annotations to output
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 31 Aug 2023 10:01:40 +0000 |
parents | ab37fcb71744 |
children | 737579209153 |
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module top (CLK12, LED1, LED2, LED3, LED4, LED5, UART_TxD, UART_RxD, UART_RTS, UART_CTS, UART_DTR, UART_DSR, UART_DCD, SIM_RST_in, SIM_CLK_in, SIM_IO_in, SIM_IO_out); input CLK12; output LED1, LED2, LED3, LED4, LED5; input UART_TxD, UART_RTS, UART_DTR; output UART_RxD, UART_CTS, UART_DSR, UART_DCD; input SIM_RST_in, SIM_CLK_in, SIM_IO_in; output SIM_IO_out; /* input synchronizers */ wire SIM_RST_sync, SIM_CLK_sync, SIM_IO_sync; sync_inputs sync (CLK12, SIM_RST_in, SIM_RST_sync, SIM_CLK_in, SIM_CLK_sync, SIM_IO_in, SIM_IO_sync); /* character receiver */ wire Rx_strobe, Rx_error; wire [7:0] Rx_char; wire Rx_start_bit, Rx_parity_bit; wire speed_enh_mode; wire [1:0] speed_enh_mult; sniff_rx sniff_rx (CLK12, SIM_RST_sync, SIM_CLK_sync, SIM_IO_sync, Rx_strobe, Rx_error, Rx_char, Rx_start_bit, Rx_parity_bit, speed_enh_mode, speed_enh_mult); /* PPS catcher */ wire pos_PPS_resp_PPS1, pos_PPS_resp_PCK; pps_catcher pps (CLK12, SIM_RST_sync, Rx_strobe, Rx_char, pos_PPS_resp_PPS1, pos_PPS_resp_PCK); spenh_ctrl spenh (CLK12, SIM_RST_sync, Rx_strobe, Rx_char, pos_PPS_resp_PPS1, pos_PPS_resp_PCK, speed_enh_mode, speed_enh_mult); /* explicit detection of RST transitions */ wire SIM_RST_toggle; reset_detect reset_detect (CLK12, SIM_RST_sync, SIM_RST_toggle); /* output to the host */ wire Tx_trigger; wire [15:0] Tx_data; assign Tx_trigger = Rx_strobe | SIM_RST_toggle; assign Tx_data = {SIM_RST_toggle,SIM_RST_sync,speed_enh_mode, pos_PPS_resp_PCK,pos_PPS_resp_PPS1, Rx_error,Rx_start_bit,Rx_parity_bit,Rx_char}; uart_tx uart_tx (CLK12, Tx_trigger, Tx_data, UART_RxD); /* UART modem control outputs: unused */ assign UART_CTS = 1'b1; assign UART_DSR = 1'b0; assign UART_DCD = 1'b0; /* board LEDs */ assign LED1 = 1'b1; assign LED2 = 1'b0; assign LED3 = 1'b1; assign LED4 = 1'b0; assign LED5 = SIM_RST_in; /* SIM_IO_out dummy: if someone mistakenly connects an Icestick board with * this FPGA image in it to a cardem pod instead of the sniffing one, * we ensure that the 74LVC1G07 OD buffer remains off by feeding logic HIGH * to this buffer. */ assign SIM_IO_out = 1'b1; endmodule