Freescale Semiconductor MPC5604B - Introduction

MPC5604B/C Microcontroller Reference Manual, Rev. 8
Freescale Semiconductor 301
Chapter 17
Crossbar Switch (XBAR)
17.1 Introduction
This chapter describes the multi-port crossbar switch (XBAR), which supports simultaneous connections
between two master ports and three slave ports. XBAR supports a 32-bit address bus width and a 32-bit
data bus width at all master and slave ports.
The crossbar of MPC5604B is the same as the one of all other PPC55xx and PPC56xx products except that
it cannot be configured by software and that it has a hard-wired configuration.
17.2 Block diagram
Figure 17-1 shows a block diagram of the crossbar switch.
Figure 17-1. XBAR block diagram
Table 17-1 gives the crossbar switch port for each master and slave, and the assigned and fixed ID number
for each master. The table shows the master ID numbers as they relate to the master port numbers.
Table 17-1. XBAR switch ports for MPC5604B
Module
Port
Physical master ID
Type Logical number
e200z0 core–CPU instructions Master 0 0
e200z0 core–CPU data / Nexus Master 0 1
Flash memory Slave 0 —
Internal SRAM Slave 2 —
Peripheral bridges Slave 7 —
CPU
Crossbar Switch
Flash
Master modules
Slave modules
CPU data /
Internal
Peripheral
bridges
instructions Nexus
memory
SRAM