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Intel
®
IXP42X product line and IXC1100 control plane processors—AHB/APB Bridge
Intel
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
DM September 2006
328 Order Number: 252480-006US
9.0 AHB/APB Bridge
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.
Figure 77 shows the peripherals attached to the APB.