LSISAS1068 LSI, LSISAS1068 Datasheet - Page 103

• Manufacturer Part Number: LSISAS1068
• Manufacturer: LSI

Specifications of LSISAS1068

• Lead Free Status / RoHS Status: Not Compliant

31
0
0
0
0
0
0
0
System Interface Registers->Doorbell register. The IOP clears the
interrupt status after reading the value.
Conversely, when the IOP processor writes to the System Interface
Registers->Doorbell register, the LSISAS1068 generates a maskable
interrupt to the PCI system. The host system can read the value written
by the IOP in the Host Registers->Doorbell register. The host system
clears the interrupt status bit and interrupt pin by writing any value to the
Host Registers->Interrupt Status register.
Register: 0x04
Write Sequence
Read/Write
The Write Sequence register provides a protection mechanism against
inadvertent writes to the
PCI I/O Space and Memory Space Register Description
Copyright © 2004, 2005 by LSI Logic Corporation. All rights reserved.
24 23
0
0
0
0
0
Host Doorbell Value
During a write, this register contains the doorbell value
that the host system passes to the IOP. During a read,
this register contains the doorbell value that the IOP
passes to the host system.
Reserved
This field is reserved.
Write I/O Key
To enable write access to the
Diagnostic Read/Write
ister, perform six 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: 0x00FF,
0x0004, 0x000B, 0x0002, 0x0007, and 0x000D. To disable
write access to the
tic Read/Write
perform a write of any value, except the Write I/O Key
sequence, to the Write Sequence register. The Diagnostic
Write Enable bit, bit 7 in the
cates the write access status.
0
0
Write Sequence
0
16 15
0
Host Diagnostic
0
0
Address, and
0
Diagnostic Read/Write
0
Address, and
0
0
register.
Host Diagnostic
Host Diagnostic
Diagnostic Read/Write
0
8
0
7
0
Host Diagnostic
0
0
Data,
0
register, indi-
registers,
1
Diagnos-
0
[31:0]
[31:4]
Data,
1
[3:0]
reg-
4-33
0
1