External Bus Interface
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
9-5
BDIP
Burst data in progress
1
Low
O
Driven by the MPC561/MPC563 when it owns the
external bus. It is part of the burst protocol. When
BDIP is asserted, the second beat in front of the
current one is requested by the master. This signal is
negated prior to the end of a burst to terminate the
burst data phase early.
I
Driven by an external master when it owns the
external bus. When BDIP is asserted, the second beat
in front of the current one is requested by the master.
This signal is negated prior to the end of a burst to
terminate the burst data phase early. The
MPC561/MPC563 does not support burst accesses to
internal slaves.
Transfer Start
TS
Transfer start
1
Low
O
Driven by the MPC561/MPC563 when it owns the
external bus. Indicates the start of a transaction on the
external bus.
I
Driven by an external master when it owns the
external bus. It indicates the start of a transaction on
the external bus or (in show cycle mode) signals the
beginning of an internal transaction.
Reservation Protocol
CR
Cancel reservation
1
Low
I
Each MPC500 CPU has its own CR signal. Assertion
of CR instructs the bus master to clear its reservation;
some other master has touched its reserved space.
This is a pulsed signal.
KR
Kill reservation
1
Low
I
In case of a bus cycle initiated by a STWCX
instruction issued by the RCPU to a non-local bus on
which the
storage reservation
has been lost, this
signal is used by the non-local bus interface to
back-off the cycle. Refer to
” for details.
Table 9-1. MPC561/MPC563 BIU Signals (continued)
Signal Name
Pins
Active
I/O
Description
Summary of Contents for MPC561
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