pi7c8150b Pericom Semiconductor Corporation, pi7c8150b Datasheet - Page 72

• Manufacturer Part Number: pi7c8150b
• Description: Asynchronous 2-port Pci Bridge
• Manufacturer: Pericom Semiconductor Corporation

06-0044
13
13.1
SUPPORTED COMMANDS
The PCI command set is given below for the primary and secondary interfaces.
PRIMARY INTERFACE
P_CBE [3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
Command
Interrupt
Acknowledge
Special Cycle
I/O Read
I/O Write
Reserved
Reserved
Memory Read
Memory Write
Reserved
Reserved
Configuration Read
Configuration Write
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ASYNCHRONOUS 2-PORT PCI-TO-PCI BRIDGE
Action
Ignore
Do not claim. Ignore.
1. If address is within pass through I/O range, claim and pass
through.
2. Otherwise, do not pass through and do not claim for
internal access.
Same as I/O Read.
-----
-----
1. If address is within pass through memory range, claim and
pass through.
2. If address is within pass through memory mapped I/O
range, claim and pass through.
3. Otherwise, do not pass through and do not claim for
internal access.
Same as Memory Read.
-----
-----
Type 0 Configuration Read:
If the bridge’s IDSEL line is asserted, perform function
decode and claim if target function is implemented.
Otherwise, ignore. If claimed, permit access to target
function’s configuration registers. Do not pass through
under any circumstances.
Type 1 Configuration Read:
1. If the target bus is the bridge’s secondary bus: claim and
pass through as a Type 0 Configuration Read.
2. If the target bus is a subordinate bus that exists behind the
bridge (but not equal to the secondary bus): claim and pass
through as a Type 1 Configuration Read.
3. Otherwise, ignore.
Type 0 Configuration Write: same as Configuration
Read.
Type 1 Configuration Write (not special cycle request):
1. If the target bus is the bridge’s secondary bus: claim and
pass through as a Type 0 Configuration Write
2. If the target bus is a subordinate bus that exists behind the
bridge (but not equal to the secondary bus): claim and pass
through unchanged as a Type 1 Configuration Write.
3. Otherwise, ignore.
Configuration Write as Special Cycle Request
(device = 1Fh, function = 7h)
1. If the target bus is the bridges secondary bus:
claim and pass through as a special cycle.
APRIL 2006 – Revision 2.02
PI7C8150B