| # Copyright lowRISC contributors. |
| # Licensed under the Apache License, Version 2.0, see LICENSE for details. |
| # SPDX-License-Identifier: Apache-2.0 |
| |
| # Interface configuration for JTAG on the Nexys Video board through the |
| # FT2232H chip. This connection is labeled DTPI/DSPI in the board schematics. |
| |
| # adapter speed |
| # Up to 30 MHz are supported by the FT2232H |
| adapter_khz 30000 |
| |
| adapter driver ftdi |
| transport select jtag |
| |
| ftdi_vid_pid 0x0403 0x6010 |
| |
| # Not really required, but makes communication a bit more robust |
| ftdi_tdo_sample_edge falling |
| |
| # Use Channel A (0), channel B (1) is taken by Xilinx JTAG |
| ftdi_channel 0 |
| |
| # FT2232H pin configuration |
| # |
| # Documentation: |
| # http://openocd.org/doc-release/html/Debug-Adapter-Configuration.html#Interface-Drivers |
| # |
| # Our configuration: |
| # |
| # Bit MPSSE FT2232 JTAG Type RstVal Description |
| # ---------------------------------------------------------------------- |
| # Bit0 TCK ADBUS0 TCK Out 0 Clock Signal Output |
| # Bit1 TDI ADBUS1 TDI Out 0 Serial Data Out |
| # Bit2 TDO ADBUS2 TDO In 0 Serial Data In |
| # Bit3 TMS ADBUS3 TMS Out 1 Select Signal Out |
| # Bit4 GPIOL0 ADBUS4 nTRST Out 1 General Purpose I/O |
| # Bit5 GPIOL1 ADBUS5 nSRST Out 1 General Purpose I/O |
| # Bit6 GPIOL2 ADBUS6 0 Out 0 General Purpose I/O |
| # Bit7 GPIOL3 ADBUS7 0 Out 0 General Purpose I/O |
| # |
| # Bit6 GPIOL2 is used to select between JTAG=1 and SPI=0 and controls |
| # the I/O MUX inside the earlgrey_nexsysvideo. Static so it is only |
| # mentioned in the init command below (makes it output value 1) |
| # |
| # Bit7 GPIOL3 is used to enable boot rom boot strap |
| # |
| # This corresponds to the following reset values (first number), and |
| # in/out layout (second number): |
| ftdi_layout_init 0x0078 0x00fb |
| |
| # TAP reset (nTRST) |
| ftdi_layout_signal nTRST -ndata 0x0010 |
| |
| # System Reset (nSRST) |
| ftdi_layout_signal nSRST -ndata 0x0020 |
| |
| # FT2232 doesn't support open drain GPIO for reset pins |
| reset_config srst_push_pull trst_push_pull |
