PXS20RM Datasheet, PDF (1159/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Chapter 37
Peripheral Bridge (PBRIDGE)
Peripheral Bridge (PBRIDGE)
37.1 Introduction
The peripheral bridge (PBRIDGE) is the interface between the system bus and on-chip peripherals.
Accesses that fall within the address space of the PBRIDGE are decoded to provide individual module
selects for peripheral devices on the slave bus interface.
The PBRIDGE will automatically manage peripheral access requests from software. In other words, you
can access a peripheral using its memory-mapped interface without having to configure the PBRIDGE.
However, the PBRIDGE also supports special peripheral access, such as memory protection, that is
available for you to use if you need it.
This device includes two instantiations of the PBRIDGE. These are called PBRIDGE_0 and PBRIDGE_1.
37.2 Block interface
System bus crossbar switch (XBAR)
Memory protection unit (MPU)
On-platform
peripherals
Peripheral
Bridge
(PBRIDGE)
Off-platform
peripherals
Figure 37-1. PBRIDGE interface
37.3 Features
The following list summarizes the key features of the PBRIDGE:
• Includes a 32-bit address bus and 64-bit data bus
• Supports 32-bit slave peripherals (byte, halfword, and word reads and writes are supported by the
bridge)
• Provides configurable per-master access protections
Freescale Semiconductor
PXS20 Microcontroller Reference Manual, Rev. 1
37-1