Programming the CPLD with the Raspberry PI

It is possible to program the CPLD if updates are released via the Raspberry PI. You will however require 5 jumper cables with single female to female connectors.

Installing xc3sprog

NOTE
The following instructions are for Raspberry PI OS Buster. They do not work on Bullseye or Bookworm. It depends on libraries that are no longer available on newer Raspberry PI OS versions.
An old Raspberry PI OS TIPI image based on Buster is available here: tipi-sdimage-buster-2.37.zip
For newer versions such as bookworm, you will likely require a USB ftdi cable, and the official xc3sprog package installed

There is a software package to program the .jed file from the Raspberry PI GPIO pins.

xc3sprog

To install, on your Buster based Raspberry PI, as user 'tipi'

cd /home/tipi
sudo apt install libftdi1
wget https://jedimatt42.com/downloads/xc3sprog_buster.zip
unzip xc3sprog_buster.zip

The xc3sprog executable will be at /home/tipi/xc3sprog/build/xc3sprog

Wiring

The JTAG programming port on the TIPI board has the following pinout:

2 4 6 8 10
1 3 5 7 9

Connect the TIPI JTAG connector to the Raspberry PI as follows:

(Note: the RPi numbers are pin count numbers and not the BCM chip numbers)

JTAG pin	purpose	RPi GPIO
1	TCK	11
2	GND	9
3	TDO	13
5	TMS	7
9	TDI	15

Power

Plug your TIPI board back into the PEB, and turn it on. Let your computer boot, and become idle, like sitting at an MDOS prompt or the TI title screen.

The CPLD (Xilinx chip) must be provided power other than through the programming port. This can be in system from the PEB, or 4A depending on the card. On my workbench I typically provide 5v bench power to the ROM socket which then powers the board.

Download .jed file

wget https://www.jedimatt42.com/downloads/tipi_cpld.zip
unzip tipi_cpld.zip

You should have a file named tipi_top.jed

Program the CPLD

Test that the JTAG chain recognizes the CPLD

sudo /home/tipi/xc3sprog/build/xc3sprog -c sysfsgpio_creator

You should see:

[sudo] password for tipi: 
XC3SPROG (c) 2004-2011 xc3sprog project $Rev: 774 $ OS: Linux
Free software: If you contribute nothing, expect nothing!
Feedback on success/failure/enhancement requests:
	http://sourceforge.net/mail/?group_id=170565 
Check Sourceforge for updates:
	http://sourceforge.net/projects/xc3sprog/develop

JTAG loc.:   0  IDCODE: 0x59608093  Desc:                      XC95144XL Rev: E  IR length:  8

Program the CPLD

sudo /home/tipi/xc3sprog/build/xc3sprog -v -c sysfsgpio_creator -p 0 tipi_top.jed:w

When it is complete you should see:

XC3SPROG (c) 2004-2011 xc3sprog project $Rev: 774 $ OS: Linux
Free software: If you contribute nothing, expect nothing!
Feedback on success/failure/enhancement requests:
	http://sourceforge.net/mail/?group_id=170565 
Check Sourceforge for updates:
	http://sourceforge.net/projects/xc3sprog/develop

Using built-in device list
Using built-in cable list
JTAG chainpos: 0 Device IDCODE = 0x59608093	Desc: XC95144XL
Device is blank
Programming Sector 107.                            
Programming  time 14004.0 ms
Verify Sector 107
Success! Verify time 1293.9 ms

Cleanup

You should be able to test now. Once you are satisfied, power down the PEB, remove the TIPI board, remove the JTAG wires, and then put things back the way you had before this process.