Overview - Freescale Semiconductor MCF5329 Reference Manual

Chapter 12
Crossbar Switch (XBS)
12.1

Overview

This section provides information on the layout, configuration, and programming of the crossbar switch.
The crossbar switch connects the bus masters and bus slaves using a crossbar switch structure. This
structure allows bus masters to access different bus slaves simultaneously with no interference while
providing arbitration among the bus masters when they access the same slave. A variety of bus arbitration
methods and attributes may be programmed on a slave by slave basis.
The MCF5329 devices have up to seven masters and four slaves (7Mx4S) connected to the crossbar
switch. The seven masters are the ColdFire core, eDMA controller, FEC, LCD controller, USB host, USB
OTG modules, and a reserved master for factory test. The slaves are FlexBus/SDRAM controller, SRAM
controller, cryptography modules,and the peripheral bus controller.
Figure 12-1 is a block diagram of the MCF5329 family bus architecture showing the crossbar switch
configuration.
ColdFire eDMA
Core Controller
M0
FlexBus/SDRAM
Controller
Freescale Semiconductor
Fast Ethernet LCD
Controller Controller
M1 M2 M4
Crossbar Switch
S1 S4
SRAM
Backdoor
Figure 12-1. Bus Architecture Block Diagram
MCF5329 Reference Manual, Rev 3
USB USB On-the-Go
Host Module
M5 M6
S6 S7
Cryptography Other On-chip
Modules Slave Peripherals
Reserved for
Factory Test
Master Modules
M7
Slave Modules
12-1