MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
12-49
shows the truth table for the internal arbiter protocol.
Table 12-21. Internal Arbiter State Descriptions
State
Description
Outputs
MCU Owner Idle
MCU owns bus, but is not currently running a transaction
BG = 1, BB = hiZ
Ext. Owner
Ext. master owns bus, may or may not be running a transaction
BG = 0, BB = hiZ
MCU Bus Wait
MCU owns bus for next transaction, waiting for ext. owner to negate BB
from current transaction in progress
BG = 1, BB = hiZ
MCU Owner Busy
MCU owns bus, and is currently running a transaction
BG = 1, BB = 0/1
Ext. Bus Wait
Ext. master owns bus for next transaction, waiting for MCU to negate
BB from current transaction in progress
BG = 0, BB = 0/1
Table 12-22. Internal Arbiter Truth Table
State
Outputs
Inputs
Next State
BG
BB
1
BR
2
(previ
ous)
BB
3
(previ
ous)
MCU
Internal
Request
Pending
(IRP)
4
(previous)
External
has
Higher
Priority
(EHP)
5
MCU Ext.
Transaction
in Progress
(or starting
next cycle)
(ETP)
6
Recent
BG
(RBG)
7
MCU Owner Idle
1
hiZ
1
X
0
0
0
X
8
MCU Owner Idle
MCU Owner Idle
1
hiZ
X
X
0
1
0
X
9
Ext. Owner
MCU Owner Idle
1
hiZ
0
X
0
X
0
X
Ext. Owner
MCU Owner Idle
1
hiZ
0
X
X
1
0
X
Ext. Owner
MCU Owner Idle
1
hiZ
X
X
1
0
X
X
MCU Owner
Busy
MCU Owner Idle
1
hiZ
1
X
1
X
X
X
MCU Owner
Busy
MCU Owner Idle
1
hiZ
X
X
X
X
1
X
MCU Owner
Busy
Ext. Owner
0
hiZ
X
X
0
X
X
10
X
11
Ext. Owner
Ext. Owner
0
hiZ
0
X
X
1
X
X
Ext. Owner
Ext. Owner
0
hiZ
X
X
1
0
X
X
MCU Bus Wait
Ext. Owner
0
hiZ
1
X
1
X
X
X
MCU Bus Wait
MCU Bus Wait
1
hiZ
X
0
X
12
X
X
X
MCU Bus Wait
MCU Bus Wait
1
hiZ
X
X
X
X
X
1
MCU Bus Wait
MCU Bus Wait
1
hiZ
X
1
X
X
X
0
MCU Owner
Busy
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