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)
Summary of Contents for MSC8113
Page 1: ...MSC8113 Reference Manual Tri Core 16 Bit Digital Signal Processor MSC8113RM Rev 0 May 2008 ...
Page 20: ...MSC8113 Reference Manual Rev 0 xx Freescale Semiconductor Contents ...
Page 28: ...MSC8113 Reference Manual Rev 0 xxviii Freescale Semiconductor ...
Page 56: ...MSC8113 Reference Manual Rev 0 1 28 Freescale Semiconductor MSC8113 Overview ...
Page 76: ...MSC8113 Reference Manual Rev 0 2 20 Freescale Semiconductor SC140 Core Overview ...
Page 134: ...MSC8113 Reference Manual Rev 0 4 30 Freescale Semiconductor System Interface Unit SIU ...
Page 168: ...MSC8113 Reference Manual Rev 0 6 18 Freescale Semiconductor Boot Program ...
Page 180: ...MSC8113 Reference Manual Rev 0 7 12 Freescale Semiconductor Clocks ...
Page 260: ...MSC8113 Reference Manual Rev 0 8 80 Freescale Semiconductor Memory Map ...
Page 300: ...MSC8113 Reference Manual Rev 0 9 40 Freescale Semiconductor Extended Core ...
Page 304: ...MSC8113 Reference Manual Rev 0 10 4 Freescale Semiconductor MQBus and M2 Memory ...
Page 308: ...MSC8113 Reference Manual Rev 0 11 4 Freescale Semiconductor SQBus ...
Page 590: ...MSC8113 Reference Manual Rev 0 17 46 Freescale Semiconductor Interrupt Processing ...
Page 614: ...MSC8113 Reference Manual Rev 0 18 24 Freescale Semiconductor Debugging ...
Page 622: ...MSC8113 Reference Manual Rev 0 19 8 Freescale Semiconductor Internal Peripheral Bus IPBus ...
Page 724: ...MSC8113 Reference Manual Rev 0 21 32 Freescale Semiconductor UART ...
Page 920: ...MSC8113 Reference Manual Rev 0 25 150 Freescale Semiconductor Ethernet Controller ...
Page 1171: ...MSC8113 Reference Manual Rev 0 Freescale Semiconductor C 61 EF wait_rts P 01077FFC 9F rts 71 ...
Page 1172: ...MSC8113 Reference Manual Rev 0 C 62 Freescale Semiconductor MSC8113 Boot Code ...
Page 1202: ...MSC8113 Reference Manual Rev 0 Index 30 Freescale Semiconductor Index ...