Intel IXC1100 用户手册

Intel

®

 IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor

DM

September 2006

328

Order Number: 252480-006US

The APB Bridge is used to connect the high-speed AHB to the lower-speed peripherals 

connected to the APB. The AHB-APB Bridge provides a 32-bit wide data path between 

the South AHB and the APB.

Address bits 31:16 of the AHB bus are not sent to the bridge, but are instead decoded 

by the AHB arbiter and a select signal is used to indicate that the address references a 

location downstream of the bridge. Address bits 15:12 are decoded by the bridge and 

used to determine which of the APB peripherals is selected. Address bits 1:0 are not 

sent to the APB peripheral. All access must be word-aligned irrelevant of the bus size of 

the peripheral. There are 1,024 32-bit addresses supplied for each peripheral. 

 shows the peripherals attached to the APB.