External Bus Interface
13-34 MPC823e REFERENCE MANUAL MOTOROLA
EXTERNAL BUS
13
INTERFACE
Table 13-5. Address Space Definitions
STS TS AT[0] AT[1] AT[2] AT[3] PTR RSV DEFINITIONS
CORE/CPM PROBLEM STATE/
PRIVILEGE STATE
INSTRUCTION/
DATA
RESERVATION/
PROGRAM
TRACE
PROGRAM
TRACE
RESERVATION
1 x x x x x 1 1 No Transfer or no first transaction of a transfer
0 x x x x x x x Start of a transaction
x 0 0 0 0 0 0 1 Core, Normal Instruction, Program Trace, Privilege
State
1 1 1 Core, Normal Instruction, Privilege State
1 0 1 0 Core, Reservation Data, Privilege State
1 1 1 Core, Normal Data, Privilege State
1 0 0 0 1 Core, Normal Instruction, Program Trace, Problem
State
1 1 1 Core, Normal Instruction, Problem State
1 0 1 0 Core, Reservation Data, Problem State
1 1 1 Core, Normal Data, Problem State
1 CH0 CH1 CH2 1 1 No Core, Normal, (CH indicates channel number)
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