marija
Newbie level 3
Hi,
I have a question related to the JTAG (1149.1) protocol, related to a serial connection of TAPs. It is stated in the Standard that in the Capture-IR state the lowest two bits of IR are changed to 01. So, if I load an instruction to the first TAP, and then load a second instruction to the same TAP - hoping that the first one will now affect the second TAP in scan chain - how can it be that this bit alternation will not ruin the instruction code?
For example, the first instruction has code 0b1100, after Capture-IR it is 0b1101. When I load the second instruction to the first TAP - 0b1101 is what i get in the second TAP IR, right?
Thanks...
I have a question related to the JTAG (1149.1) protocol, related to a serial connection of TAPs. It is stated in the Standard that in the Capture-IR state the lowest two bits of IR are changed to 01. So, if I load an instruction to the first TAP, and then load a second instruction to the same TAP - hoping that the first one will now affect the second TAP in scan chain - how can it be that this bit alternation will not ruin the instruction code?
For example, the first instruction has code 0b1100, after Capture-IR it is 0b1101. When I load the second instruction to the first TAP - 0b1101 is what i get in the second TAP IR, right?
Thanks...