Exception Control Cycles - Motorola MPC823e Reference Manual

remote bus supports aborted cycles. The failure of the stwcx instruction is reported to
the core.
BUS
MPC823e
INTERFACE
Figure 13-27. Reservation On Multilevel Bus Hierarchy

13.4.11 Exception Control Cycles

The MPC823e bus architecture requires the TA signal to be asserted from an external
device to indicate that the bus cycle is complete. TA is not asserted when one of the
following conditions occur:
• The external device does not respond
• Other application-dependent errors occur
MOTOROLA
MPC823e EXTERNAL BUS
AT[0:3], RSV, R/W, TS
KR
Q S
R
REMOTE BUS
MPC823e REFERENCE MANUAL
External Bus Interface
A[6:31]
EXTERNAL DEVICE
LOCAL BUS
INTERFACE
MASTER IN THE REMOTE
BUS WRITES TO THE
RESERVED LOCATION
13-41