![Intel IXP45X Скачать руководство пользователя страница 515](http://html1.mh-extra.com/html/intel/ixp45x/ixp45x_developers-manual_2073092515.webp)
Intel
®
IXP45X and Intel
®
IXP46X Product Line of Network Processors
August 2006
Develepor’s Manual
Order Number: 306262-004US
515
PCI Controller—Intel
®
IXP45X and Intel
®
IXP46X Product Line of Network Processors
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.
Figure 82.
Initiated PCI Type-1 Configuration Read Cycle
B4284-01
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
DA TA
0x0
0x00000010
0x B