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VR4102 Datasheet(PDF) 149 Page - NEC

Part # VR4102
Description  64/32-bit Microprocessor
PDF  701 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

VR4102 Datasheet(HTML) 149 Page - NEC

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CHAPTER 5 MEMORY MANAGEMENT SYSTEM
149
5.5.5 Processor Revision Identifier (PRId) Register (15)
The 32-bit, read-only Processor Revision Identifier (PRId) register contains information identifying the
implementation and revision level of the CPU and CP0. Figure 5-16 shows the format of the PRId register.
Figure 5-16. PRId Register
15
16
7
8
0
31
0
Imp
Rev
16
8
8
Imp : CPU core processor ID number (0x0C for the VR4102)
Rev : CPU core processor revision number
0
: Reserved for future use. Write 0 in a write operation. When this field is read, 0 is read.
The processor revision number is stored as a value in the form y.x, where y is a major revision number in bits 7 to
4 and x is a minor revision number in bits 3 to 0.
The processor revision number can distinguish some CPU core revisions, however there is no guarantee that
changes to the CPU core will necessarily be reflected in the PRId register, or that changes to the revision number
necessarily reflect real CPU core changes. Therefore, create a program that does not depend on the processor
revision number area.



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