| # Copyright lowRISC contributors. |
| # Licensed under the Apache License, Version 2.0, see LICENSE for details. |
| # SPDX-License-Identifier: Apache-2.0 |
| # |
| # Generic constraints file for simple testsynthesis flow |
| |
| # note that we do not fix hold timing in this flow |
| set SETUP_CLOCK_UNCERTAINTY 0.5 |
| |
| puts "Applying constraints for top level" |
| |
| # note: this does not account for clock insertion delay and |
| # there are no pads instantiated in the netlist (yet) |
| |
| ##################### |
| # DIO pin mapping # |
| ##################### |
| set PORT_SPI_DEVICE_SCK 14 |
| set PORT_SPI_DEVICE_CSB 13 |
| set PORT_SPI_DEVICE_MOSI 12 |
| set PORT_SPI_DEVICE_MISO 11 |
| |
| set PORT_UART_RX 10 |
| set PORT_UART_TX 9 |
| |
| set PORT_USBDEV_SENSE 8 |
| set PORT_USBDEV_SE0 7 |
| set PORT_USBDEV_DP_PULLUP 6 |
| set PORT_USBDEV_DN_PULLUP 5 |
| set PORT_USBDEV_TX_MODE_SE 4 |
| set PORT_USBDEV_SUSPEND 3 |
| set PORT_USBDEV_D 2 |
| set PORT_USBDEV_DP 1 |
| set PORT_USBDEV_DN 0 |
| |
| ##################### |
| # main clock # |
| ##################### |
| set MAIN_CLK_PIN clk_i |
| set MAIN_RST_PIN rst_ni |
| # 125 MHz |
| set MAIN_TCK 8.0 |
| set_ideal_network ${MAIN_CLK_PIN} |
| set_ideal_network ${MAIN_RST_PIN} |
| |
| create_clock -name MAIN_CLK -period ${MAIN_TCK} [get_ports ${MAIN_CLK_PIN}] |
| set_clock_uncertainty ${SETUP_CLOCK_UNCERTAINTY} [get_clocks MAIN_CLK] |
| |
| # TODO: generated clock |
| # TODO: clock gating setup/hold |
| |
| |
| set IN_DEL 5.5 |
| set OUT_DEL 5.5 |
| |
| # Doesn't need |
| #set_input_delay ${IN_DEL} [get_ports scanmode_i] -clock MAIN_CLK |
| |
| ##################### |
| # USB clock # |
| ##################### |
| set USB_CLK_PIN clk_usb_i |
| # 50MHz |
| set USB_TCK 20.0 |
| set_ideal_network ${USB_CLK_PIN} |
| |
| create_clock -name USB_CLK -period ${USB_TCK} [get_ports ${USB_CLK_PIN}] |
| set_clock_uncertainty ${SETUP_CLOCK_UNCERTAINTY} [get_clocks USB_CLK] |
| |
| set IN_DEL 17.0 |
| set OUT_DEL 17.0 |
| |
| set_input_delay ${IN_DEL} [get_ports dio_in_i[$PORT_USBDEV_SENSE]] -clock USB_CLK |
| set_input_delay ${IN_DEL} [get_ports dio_in_i[$PORT_USBDEV_DP]] -clock USB_CLK |
| set_input_delay ${IN_DEL} [get_ports dio_in_i[$PORT_USBDEV_DN]] -clock USB_CLK |
| |
| set_output_delay ${OUT_DEL} [get_ports dio_out_o[$PORT_USBDEV_DP_PULLUP]] -clock USB_CLK |
| set_output_delay ${OUT_DEL} [get_ports dio_oe_o[$PORT_USBDEV_DP_PULLUP]] -clock USB_CLK |
| set_output_delay ${OUT_DEL} [get_ports dio_out_o[$PORT_USBDEV_DN_PULLUP]] -clock USB_CLK |
| set_output_delay ${OUT_DEL} [get_ports dio_oe_o[$PORT_USBDEV_DN_PULLUP]] -clock USB_CLK |
| set_output_delay ${OUT_DEL} [get_ports dio_out_o[$PORT_USBDEV_DP]] -clock USB_CLK |
| set_output_delay ${OUT_DEL} [get_ports dio_oe_o[$PORT_USBDEV_DP]] -clock USB_CLK |
| set_output_delay ${OUT_DEL} [get_ports dio_out_o[$PORT_USBDEV_DN]] -clock USB_CLK |
| set_output_delay ${OUT_DEL} [get_ports dio_oe_o[$PORT_USBDEV_DN]] -clock USB_CLK |
| |
| ##################### |
| # IO clk (24MHz) # |
| ##################### |
| set IO_CLK_PIN clk_io_i |
| set IO_TCK 40.0 |
| set_ideal_network ${IO_CLK_PIN} |
| |
| create_clock -name IO_CLK -period ${IO_TCK} [get_ports ${IO_CLK_PIN}] |
| set_clock_uncertainty ${SETUP_CLOCK_UNCERTAINTY} [get_clocks IO_CLK] |
| |
| # TODO: generated clock |
| # TODO: clock gating setup/hold |
| |
| set IN_DEL 20.0 |
| set OUT_DEL 20.0 |
| |
| set_input_delay ${IN_DEL} [get_ports mio_in_i*] -clock IO_CLK |
| |
| set_output_delay ${OUT_DEL} [get_ports mio_out_o*] -clock IO_CLK |
| set_output_delay ${OUT_DEL} [get_ports mio_oe_o*] -clock IO_CLK |
| |
| # UART RX |
| set_input_delay ${IN_DEL} [get_ports dio_in_i[$PORT_UART_RX]] -clock IO_CLK |
| |
| # UART TX |
| set_output_delay ${OUT_DEL} [get_ports dio_out_o[$PORT_UART_TX]] -clock IO_CLK |
| set_output_delay ${OUT_DEL} [get_ports dio_oe_o[$PORT_UART_TX]] -clock IO_CLK |
| |
| ##################### |
| # AON clk (300kHz) # |
| ##################### |
| set AON_CLK_PIN clk_aon_i |
| set AON_TCK 3333.0 |
| set_ideal_network ${AON_CLK_PIN} |
| |
| create_clock -name AON_CLK -perio ${AON_TCK} [get_ports ${AON_CLK_PIN}] |
| set_clock_uncertainty ${SETUP_CLOCK_UNCERTAINTY} [get_clocks AON_CLK] |
| |
| # use same IO IN/OUT delay |
| |
| ##################### |
| # JTAG clock # |
| ##################### |
| set JTAG_CLK_PIN jtag_tck_i |
| set JTAG_RST_PIN jtag_trst_ni |
| # 40MHz |
| set JTAG_TCK 25.0 |
| set_ideal_network ${JTAG_CLK_PIN} |
| set_ideal_network ${JTAG_RST_PIN} |
| |
| create_clock -name JTAG_CLK -period ${JTAG_TCK} [get_ports ${JTAG_CLK_PIN}] |
| set_clock_uncertainty ${SETUP_CLOCK_UNCERTAINTY} [get_clocks JTAG_CLK] |
| |
| set IN_DEL 10.0 |
| set OUT_DEL 10.0 |
| |
| set_input_delay ${IN_DEL} [get_ports jtag_tms_i] -clock JTAG_CLK |
| set_input_delay ${IN_DEL} [get_ports jtag_tdi_i] -clock JTAG_CLK |
| |
| set_output_delay ${OUT_DEL} [get_ports jtag_tdo_o] -clock JTAG_CLK |
| |
| ##################### |
| # SPI clock # |
| ##################### |
| set SPI_CLK_PIN dio_in_i[$PORT_SPI_DEVICE_SCK] |
| # 62.5MHz |
| set SPI_TCK 16.0 |
| set_ideal_network ${SPI_CLK_PIN} |
| |
| create_clock -name SPID_CLK -period ${SPI_TCK} [get_ports ${SPI_CLK_PIN}] |
| set_clock_uncertainty ${SETUP_CLOCK_UNCERTAINTY} [get_clocks SPID_CLK] |
| |
| ## TODO: Create generated clock for negedge SPID_CLK. Then make them clock group |
| |
| set IN_DEL 6.0 |
| set OUT_DEL 6.0 |
| |
| set_input_delay ${IN_DEL} [get_ports dio_in_i[$PORT_SPI_DEVICE_CSB]] -clock SPID_CLK |
| set_input_delay ${IN_DEL} [get_ports dio_in_i[$PORT_SPI_DEVICE_MOSI]] -clock SPID_CLK |
| |
| set_output_delay ${OUT_DEL} [get_ports dio_out_o[$PORT_SPI_DEVICE_MISO]] -clock SPID_CLK |
| set_output_delay ${OUT_DEL} [get_ports dio_oe_o[$PORT_SPI_DEVICE_MISO]] -clock SPID_CLK |
| |
| ##################### |
| # CDC # |
| ##################### |
| |
| # this may need some refinement (and max delay / skew needs to be constrained) |
| set_clock_groups -name group1 -async -group [get_clocks MAIN_CLK] \ |
| -group [get_clocks JTAG_CLK] \ |
| -group [get_clocks USB_CLK ] \ |
| -group [get_clocks SPID_CLK] \ |
| -group [get_clocks IO_CLK ] \ |
| -group [get_clocks AON_CLK ] |
| |
| # loopback path can be considered to be a false path |
| set_false_path -from dio_in_i[$PORT_UART_RX] -to dio_out_o[$PORT_UART_TX] |
| |
| ##################### |
| # I/O drive/load # |
| ##################### |
| |
| # attach load and drivers to IOs to get a more realistic estimate |
| set_driving_cell -no_design_rule -lib_cell ${driving_cell} -pin X [all_inputs] |
| set_load [load_of ${load_lib}/${load_cell}/A] [all_outputs] |
| |
| # set a nonzero critical range to be able to spot the violating paths better |
| # in the report |
| set_critical_range 0.5 ${DUT} |
