External Bus Interface
MPC561/MPC563 Reference Manual, Rev. 1.2
9-4
Freescale Semiconductor
.
Table 9-1. MPC561/MPC563 BIU Signals
Signal Name
Pins
Active
I/O
Description
Address and Transfer Attributes
ADDR[8:31]
Address bus
24
[8:31]
High
O
Specifies the physical address of the bus transaction.
I
Driven by an external bus master when it owns the
external bus. An input for testing purposes only.
RD/WR
Read/write
1
HIgh
O
Driven by the MPC561/MPC563 along with the
address when it owns the external bus. Driven high
indicates that a read access is in progress. Driven low
indicates that a write access is in progress.
I
Driven by an external master when it owns the
external bus. Driven high indicates that a read access
is in progress. Driven low indicates that a write access
is in progress.
BURST
Burst transfer
1
Low
O
Driven by the MPC561/MPC563 along with the
address when it owns the external bus. Driven low
indicates that a burst transfer is in progress. Driven
high indicates that the current transfer is not a burst.
I
Driven by an external master when it owns the
external bus. Driven low indicates that a burst transfer
is in progress. Driven high indicates that the current
transfer is not a burst. The MPC561/MPC563 does
not support burst accesses to internal slaves.
TSIZ[0:1]
Transfer size
2
High
O
Driven by the MPC561/MPC563 along with the
address when it owns the external bus. Specifies the
data transfer size for the transaction.
I
Driven by an external master when it owns the
external bus. Specifies the data transfer size for the
transaction.
AT[0:3]
Address type
3
High
O
Driven by the MPC561/MPC563 along with the
address when it owns the external bus. Indicates
additional type on the current transaction.
I
Only for testing purposes.
RSV
Reservation transfer
1
Low
O
Driven by the MPC561/MPC563 along with the
address when it owns the external bus. Indicates
additional information about the address on the
current transaction.
I
Only for testing purposes.
PTR
Program trace
1
High
O
Driven by the MPC561/MPC563 along with the
address when it owns the external bus. Indicates
additional information about the address on the
current transaction.
I
Only for testing purposes.
Summary of Contents for MPC561
Page 84: ...MPC561 MPC563 Reference Manual Rev 1 2 lxxxiv Freescale Semiconductor...
Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...