4.2 Description of the First Documented Facts …
305
The register space of the specialized hardware interface based on the IEE
1149.1 standard
Variability of registers of the specialized hardware interface based on the
IEE 1149.1 standard
Known command register
Found command register
Rewritable interrupt register
Read-only interrupt register
Size of the interrupt register
Size of the interrupt register
Da
ta
reg
ist
er
ca
pa
cit
y
Da
ta
reg
ist
er
ca
pa
cit
y
Fig. 4.19 Experimental results of scanning the standard JTAG port of the ProASIC3 microcircuit:
presented are the main results of analysis of the hidden registers (a) and the results of analysis of
the stable DR registers (b) [116]