Initiated Pci Type-1 Configuration Read Cycle; Initiated Type-1 Write Transaction - Intel IXP45X Developer's Manual

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PCI Controller—Intel IXP45X and Intel
Figure 82.

Initiated PCI Type-1 Configuration Read Cycle

PCI_CLK
INT_REQ_N
INT_GNT_N
PCI_FRAME_N
PCI_AD (31:0)
PCI_IDSEL
PCI_CBE_N
PCI_IRDY_N
PCI_TRDY_N
PCI_DEVSEL_N
10.2.7.4

Initiated Type-1 Write Transaction

The following transaction is a PCI Configuration Write working-site cycle initiated from
the IXP45X/IXP46X network processors. This diagram is to understand the inner
workings of PCI transfers and may not reflect actual operation of the PCI Controller
implemented on the IXP45X/IXP46X network processors. The transaction is initiated to
PCI bus segment 5, Device number 3, Function number 7, and Base Address Register
0.
This configuration cycle is a Type 1 configuration cycle and is intended for another PCI
bus segment. Binary 01 — being located in bits 1:0 of the PCI_AD bus during the
address phase — denotes a Type 1 PCI Configuration cycle. A hexadecimal value of
0xB, written on the PCI_CBE_N bus during the address phase, signifies that this is a
PCI Bus Configuration Write Cycle.
Due to the fact that the access is on another PCI Bus Segment, the PCI_TRDY_N signal
may take longer to respond and therefore may be extended by several clocks and is not
shown here.
August 2006
Order Number: 306262-004US
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IXP46X Product Line of Network Processors
0x00000010 DA TA
0x B 0x0
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Intel IXP45X and Intel
B4284-01
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IXP46X Product Line of Network Processors
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