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Intel
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
September 2006 DM
Order Number: 252480-006US 231
PCI Controller—Intel
®
IXP42X product line and IXC1100 control plane processors
6.6.8 Initiated I/O Read Transaction
The following transaction is a PCI I/O Read Cycle initiated from the IXP42X product line
and IXC1100 control plane 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 IXP42X product line and IXC1100 control plane processors. The
transaction is initiated to address location hexadecimal 0x00000010.
A hexadecimal value of 0x2 — written on the PCI_C/BE_N bus during the address
phase — signifies that this is a PCI Bus I/O Read Cycle.
6.6.9 Initiated I/O Write Transaction
The following transaction is a PCI I/O Write Cycle initiated from the IXP42X product line
and IXC1100 control plane processors. This diagram is to understand the inner
workings of PCI transfers and may not reflect actual operation of the PCI Controller
Figure 40. Initiated PCI Memory Write Cycle
PCI_CLK
PCI_FRAME_N
PCI_AD (31:0)
PCI_IDSEL
PCI_C/BE_N
PCI_IRDY_N
PCI_TRDY_N
PCI_DEVSEL_N
0x00000014
DATA
0x7 0x0
INT_REQ_N
INT_GNT_N
Figure 41. Initiated PCI I/O Read Cycle
PCI_CLK
PCI_FRAME_N
PCI_AD (31:0)
PCI_IDSEL
PCI_C/BE_N
PCI_IRDY_N
PCI_TRDY_N
PCI_DEVSEL_N
0x00000010
DAT
A
0x2 0x0
INT_REQ_N
INT_GNT_N