MPC564EVB Freescale Semiconductor, MPC564EVB Datasheet - Page 373
![KIT EVAL FOR MPC561/562/563/564](/photos/39/39/393946/mpc564evbimage_sml.jpg)
MPC564EVB
Manufacturer Part Number
MPC564EVB
Description
KIT EVAL FOR MPC561/562/563/564
Manufacturer
Freescale Semiconductor
Type
Microcontrollerr
Specifications of MPC564EVB
Contents
Module Board, Installation Guide, Power Supply, Cable, Software and more
Processor To Be Evaluated
MPC56x
Data Bus Width
32 bit
Interface Type
RS-232, Ethernet
For Use With/related Products
MPC561, 562, 563, 564
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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9.5.7.1
The potential bus master asserts BR to request bus mastership. BR should be negated as soon as the bus is
granted, the bus is not busy, and the new master can drive the bus. If more requests are pending, the master
can keep asserting its bus request as long as needed. When configured for external central arbitration, the
MPC561/MPC563 drives this signal when it requires bus mastership. When the internal on-chip arbiter is
used, this signal is an input to the internal arbiter and should be driven by the external bus master.
9.5.7.2
The arbiter asserts BG to indicate that the bus is granted to the requesting device. This signal can be
negated following the negation of BR or kept asserted for the current master to park the bus.
When configured for external central arbitration, BG is an input signal to the MPC561/MPC563 from the
external arbiter. When the internal on-chip arbiter is used, this signal is an output from the internal arbiter
to the external bus master.
Freescale Semiconductor
1. Assert BR
1. Wait for BB to be negated.
Bus Request
Bus Grant
2. Assert BB to become next master
3. Negate BR
1. Perform data transfer
1. Negate BB
Acknowledge Bus Mastership
Release Bus Mastership
Operate as Bus Master
Requesting Device
Request the Bus
MPC561/MPC563 Reference Manual, Rev. 1.2
Figure 9-24. Bus Arbitration Flowchart
1. Negate BG (or keep asserted to park
1. Assert BG
Grant Bus arbitration
Terminate Arbitration
bus master
Arbiter
External Bus Interface
9-33
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