LSI LSI53C1030, Техническое руководство

Страница: 116 / 170

4-32 PCI Host Register Description
Version 2.1 Copyright © 2001, 2002, 2003 by LSI Logic Corporation. All rights reserved.
Sequence register that is visible to both PCI functions. The two PCI
functions physically share this register.
Reserved [31:4]
This field is reserved.
Write I/O Key [3:0]
To enable write access to the Diagnostic Read/Write
Data , Diagnostic Read/Write Address , and Host Diagnos-
tic registers, perform five data-specific writes to the Write
I/O Key. Writing an incorrect value to the Write I/O Key
invalidates the key sequence and the host must rewrite
the entire sequence. The Write I/O Key sequence is:
0x0004, 0x000B, 0x0002, 0x0007, and 0x000D. To dis-
able write access to the
Diagnostic Read/Write Data ,
Diagnostic Read/Write Address , and Host Diagnostic reg-
isters, perform a write of any value, except the Write I/O
Key sequence, to the Write Sequence register. The Diag-
nostic Write Enable bit, bit 7 in the
Host Diagnostic reg-
ister, indicates the write access status.
Register: 0x08
Host Diagnostic
Read/Write
The Host Diagnostic register contains diagnostic controls and status
information. There is one
Host Diagnostic register that is visible to both
PCI functions. The two PCI functions physically share this register.
However, the Reset History bit operates independently for each PCI
function. This register can only be written when bit 7 of this register is
set.
Reserved [31:8]
This field is reserved.
Diagnostic Write Enable 7
The LSI53C1030 sets this read only bit when the host
writes the correct Write I/O Key to the
Write Sequence
register. The LSI53C1030 clears this bit when the host
31 8 7 6 5 4 3 2 1 0
Host Diagnostic
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 1 0 0 0 X 0