Extended QBus System
MSC8113 Reference Manual, Rev. 0
Freescale Semiconductor
9-7
X and P Contention. When there is contention between one of the data buses (Xa or Xb)
and the program bus (the program bus and one of the data buses address the same group in
the same cycle), an X-P contention exception occurs and
IRQ12
is generated internally.
Local Bus Contention. When there is an local bus contention—that is, the local bus and
one of the other buses (Xa, Xb, or P) address the same group in the same cycle—a local
bus contention exception occurs and
IRQ11
is generated internally.
9.3 Extended QBus System
The EQBS is the SC140 extended core interface to the MSC8113 system through the QBus. The
module handles the SC140 core and the instruction cache requests, bringing the data on the
QBus. As Figure 9-5 shows, the EQBS consists of a bus switch, a write buffer, a fetch unit, a
control unit, and the banks to handle the communication with the slaves and all EQBS registers.
The QBus masters are fetch unit, write buffer, and bus switch. The CU is the arbiter for the QBus
masters. The QBus Controller (QBC) is the unit handling internal memory contentions. It snoops
the activity on the buses connected to the M1 memory and freezes the SC140 core and address
bus activity if contention is detected. It creates the atomic instruction acknowledge to the SC140
core during the reservation process.
Figure 9-5. EQBS Block Diagram
Xb-Bus
QBus
Xa-Bus
Control
Fetch Unit
Banks
Write Buffer
Multiplexer
Multiplex
ICache
Memory
ICache
Valid
Array
Tag
Array
P-Bus
Bus Switch
Data
Address
Registers
EQBS
EQBS
Unit
Local Bus
QBus
Controller
(QBC)
Содержание MSC8113
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