CHANGE_EDREG JTAG instruction via a JAM file

You can use the JAM file below.

Using the JAM file, modify line# 9 to an arbitrary number. This is to change the CRC checksum value.

DRSCAN 32, $FFFFFFFF;

This will overwrite the CRC checksum in the Storage Register through CHANGE_EDRED instruction.

CRCERROR pin will then go high, signaling a CRC error.

--Jam file--

NOTE MAX_FREQ "10000000";

ACTION CONFIG_IO = EXECUTE;

PROCEDURE EXECUTE;

BOOLEAN X = 0;

DRSTOP IDLE;

IRSTOP IDLE;

STATE IDLE;

IRSCAN 10, $015;

DRSCAN 32, $FFFFFFFF;

STATE IDLE;

EXIT 0;

ENDPROC;