Avago Technologies LSI53C1020 - Manual (Page 117)

I/O Space and Memory Space Register Descriptions 4-39
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Register: 0x14
Diagnostic Read/Write Address
Read/Write
The Diagnostic Read/Write Address register specifies a dword location
on the internal bus. The address increments by a dword whenever the
host system accesses the
Diagnostic Read/Write Data register. This
register is only accessible through PCI I/O Space and returns
0xFFFFFFFF if read through PCI Memory Space. The host can enable
write access to this register by writing the correct Write I/O Key to the
Write Sequence register and setting bit 4, the Diagnostic Write Enable
bit, of the Host Diagnostic register. A write of any value other than the
correct Write I/O Key to the Write Sequence register disables write
access to this register.
Diagnostic Read/Write Address [31:0]
This register holds the address that the Diagnostic
Read/Write Data register writes data to or reads data
from.
31 0
Diagnostic Read/Write Address
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0