
TB9100 Reciter Service Manual
Network Circuitry
39
© Tait Electronics Limited January 2006
RISC Core
A block diagram of the PowerPC RISC core is shown in
Figure 5.3
.
The RISC processor core is a PowerPC derivative implementing a full 32-
bit integer CPU architecture. Its RISC (reduced instruction set computer)
architecture achieves a high level of performance through having a large
number (32) of internal general-purpose registers and separate integer
arithmetic and load/store (LSU) execution units, which allow several
operations to occur simultaneously. The arithmetic unit performs all
arithmetic and logical operations on data. The LSU handles data transfers
both internally to the PowerPC and to external memory and peripherals.
The performance is further enhanced by pipelining instruction fetching and
execution. Instructions are pre-fetched from memory and pre-decoded to
Figure 5.3
Processor Core Block Diagram
PIPELINES AND
BRANCH PREDICTION
Completion
Queue
Sequential
Fetcher
Branch
Processing Unit
Instruction
Queue
32-Bit
CQ5
CQ4
CQ3
CQ2
CQ1
CQ0
IQ3
IQ2
IQ1
IQ0
CTR
CR
LR
32-Bit
ALU
Performs
EA
Calculation
EXECUTION UNITS
Integer
Unit
XER
/
«
+
Load/Store
Unit (LSU)
U-Bus Interface
Tags
Kbyte
D-Cache
Data
MMU
Entry
DTLB
Instruction
MMU
Entry
ITLB
Tags
Kbyte
I-Cache
CACHE AND
MEMORY MANAGER
One Instruction Retired
per Clock
32-Bit (One Instruction)
32-Bit
32-Bit (One Instruction)
GPR File
(32-Entry)
Additional Features
Power Dissipation Control
Time Base Counter
Decrementer
JTAG
BDM Interface
Clock Multiplier
32-Bit
32-Bit
32-Bit
L-Bus
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