I started developing my own JTAG program for my particular needs( my MIPS CPU)
It works OK for IDCODE and IMPCODE instructions. In other words my program
works well
for those instructions that does not need any input data ( no need to change
bits in EJTAG
registers).
But it does not seem to work well for those instructions that needs input data.
For example for EJTAG Control Register.
As an example I want to halt the CPU ,so I must write
EjtagBrk bit( 12 bit of EJTAG Control Register)
into EJTAG Control Register.
Then I should read DM bit( 3 bit of EJTAG Control Register).
and if it is halted successfully, that bit must be set ( by CPU) to 1.
So I
send CONTROL instruction that selects EJTAG Control register
But how shall I send the data into EJTAG Control Register?
I have a procedure that READs data from JTAG data register but not sure how to
WRITE data
into the JTAG data register.
And must I send CONTROL instruction both before writing data and before reading
the results or
jast before writing data?
Thanks for help
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