PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor 16-1
Chapter 16
AMBA Crossbar Switch (AXBS)
16.1 Introduction
This chapter describes the multi-port crossbar switch (AXBS), which supports simultaneous connections
between six master ports and six slave ports. The AXBS supports a 32-bit address bus width and a 64-bit
data bus width at all master and slave ports.
16.1.1 Block Diagram
Figure 16-1 shows a block diagram of the crossbar switch.
Figure 16-1. AXBS Block Diagram
16.1.2 AXBS Controller Configuration
The AMBA Crossbar Switch (AXBS) supports six masters running at system frequency. The master data
bus width is 64 bits. Table 16-1 summarizes the crossbar master port assignments and the Master IDs.
Table 16-1. Master Assignments and Master IDs
AXBS Port AXBS Module Master ID
M0 Z6 Core 0
Z6 Nexus 8
M1 eDMA 2
M2 Off Platform (MLB) 5
M3 FEC 4
Master
Crossbar Switch
Slave
Master modules
Slave modules
Master
Master
Slave
Slave
. . . .
. . . .
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