ir_in output does not match input value in Virtual_jtag megafunction

Hello,

I am using the virtual_jtag megafunction to establish a communication between my computer and my dev board.

It seems that the value I read on the ir_in output does not always correspond to the value I sent via the tcl function device_virtual_ir_shift. For 1 and 2-bit wide virtual_ir, everything is fine but with a 3-bit wide virtual-ir, here is what I obtain :

Value sent | Value read on ir_in

000 | 000

001 | 001

010 | 000

011 | 001

100 | 100

101 | 101

110 | 110

111 | 111

It is even worse with 4 bits.

Do you have any idea where this could come from?

Thank you,

Zenzen