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MSC8113 Reference Manual, Rev. 0
1-14
Freescale Semiconductor
MSC8113 Overview
1.2.1.4 QBus System
The QBC is a bus controller that handles internal memory contentions. It snoops the activity on
the buses connected to the internal memory and freezes the SC140 core and address bus activity.
It creates the atomic instruction acknowledge to the SC140 core during the reservation process.
The EQBS enables the SC140 core to communicate with external devices efficiently. It handles
the switching between the three core buses and the QBus. SC140 core accesses that apply to
memory space above the internal memory (QBus Base Line = 0x00F00000) are transferred to the
QBus through the EQBS. The EQBS also connects to the instruction cache and initiates requests
for cache updates in order to improve the hit ratio. The EQBS operates at the same frequency as
the SC140 core. The module handles the SC140 core and the instruction cache requests, bringing
the data on the QBus. As Figure 1-4 shows, the EQBS consists of a bus switch to handle data
read operations, a write buffer to handle data write operations, a fetch unit to handle all program
read operations, a control unit, and the banks to handle the communication with the slaves and all
EQBS registers.
Note:
For details, see Section 9.4, Instruction Cache (ICache), on page 9-24.
The QBus masters are the fetch unit, write buffer, and bus switch. The control unit is the arbiter
for the QBus masters.The bus switch handles all data read above the QBus baseline, write
operations when the write buffer is disabled, and atomic (read modify write) write operations.
Read accesses of program (fetch) that are above the QBus baseline occur through the fetch unit.
Figure 1-4. EQBS Block Diagram
64
128
64
EQBS
Control
Fetch Unit
Banks
Write Buffer
Multiplexer
Multiplex
I-Cache
Memory
ICache
Valid
Array
Tag
Array
128
Bus Switch
Data
Address
Registers
EQBS
XA-Bus
XB-Bus
P-Bus
QBus
Unit
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 ...