Modeling registers of a chip

In reply to rdemirci:

My environment:

------------------     ----------     ---------     --------------     -----------------
| Register Model |     | Custom |     |       |     |            |     |  IC Register  |
| for DUT        |<--->|  VIP   |<--->|  DUT  |<--->|  SPI QVIP  |<--->|  Model that   |
|                |     |        |     |       |     |            |     |   I need      |
------------------     ----------     ---------     --------------     -----------------