MB86613S Datasheet, PDF (129/134 Pages) Fujitsu Component Limited. – IEEE1394 Open HCI Controller

Preliminary
Annex 1. Debug Registers
Debug register consists of Vendor Option register (128 bytes) and PCI- 1394 Direct Transfer Mode register
(128 bytes).
Base address that determines the addressing space for these register set is located in the last 2048- byte
space of 4096- byte which is set in the MEM Base Address register in PCI configuration register.
In order to enable these registers, set the DEBUG_MODE bit of the EEPROM.
RegAddr : 800h
8FCh
Vendor Option Register
FF0h
FFCh
PCI- 1394 Direct Xfer Mode Register
Fig. C.1 Address Space for Debug Register
128