AN2667 Freescale Semiconductor / Motorola, AN2667 Datasheet - Page 5

• Manufacturer Part Number: AN2667
• Description: Multi-Controller Hardware Development for the MPC5xx Family
• Manufacturer: Freescale Semiconductor / Motorola

need to program an SIUMCR [EARP] field as well. The SIUMCR [EARP] field
determines the priority of external arbitration request.
1
3.2
Each device within the system has to have its own unique identity to eliminate bus
contention. The MPC5xx family has a register specifically for setting the address of the
internal memory map. This register is called the Internal Memory Map Register (IMMR).
The IMMR[ISB0:2] field has three bits for setting the address thus allowing eight
different locations however it must be noted that ISB[0] is not compared on internal
MOTOROLA
The letters refer to 2 different devices in a system. It does not matter which device is master or slave.
How is each device differentiated?
Figure 3.1 Retry of External Master Access (Internal Arbiter)
Multi-Controller Hardware Development for the MPC5xx Family
Freescale Semiconductor, Inc.
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