WO R K I N G W I T H T H E C P U

R7:Cache Operations register

Function/operation

Data format

Instruction

 

 

 

Drain write buffer

SBZ

MCR p15, 0, Rd, c7, c10, 4

 

 

 

Wait for interrupt

SBZ

MCR p15, 0, Rd, c7, c0, 4

 

 

 

Modified virtual address format (MVA)

Set/Way format

This is the modified virtual address format for Rd for the CP15 R7 MCR operations.

31

S+5

S+4

5

4

2

1

0

Tag

 

Set(=index)

 

Word

 

SBZ

 

 

 

 

 

 

 

 

The tag, set, and word fields define the MVA.

For all cache operations, the word field SHOULD BE ZERO.

This is the Set/Way format for Rd for the CP15 R7 MCR operations.

31 32-A

31-A

S+5 S+4

5 4

2 1 0

Way

SBZ

 

Set(=index)

 

Word

 

SBZ

 

 

 

 

 

 

 

 

Set/Way example

Test and clean DCache instructions

A and S are the base-two logarithms of the associativity and the number of sets.

The set, way, and word files define the format.

For all of the cache operations, word SHOULD BE ZERO.

For example, a 16 KB cache, 4-way set associative, 8-word line results in the following:

A= log2 associativity = log24 = 2 S = log2 NSETS where

NSETS = cache size in bytes/associativity/line length in bytes: NSETS = 16384/4/32 = 128

Result: S = log2 128 = 7

The test and clean DCache instruction provides an efficient way to clean the entire DCache, using a simple loop. The test and clean DCache instruction tests a number of lines in the DCache to determine whether any of them are dirty. If any dirty lines are found, one of those lines is cleaned. The test and clean DCache instruction also returns the status of the entire DCache in bit 30.

96Hardware Reference NS9215

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Digi NS9215 manual Modified virtual address format MVA Set/Way format, Set/Way example Test and clean DCache instructions

NS9215 specifications

The Digi NS9215 is a powerful solution designed for industrial applications that require reliable connectivity and robust performance. Built on a foundation of advanced technologies, the NS9215 serves as a versatile networking device that meets the demands of automation, remote monitoring, and data acquisition.

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The user-friendly interface of the NS9215 allows for easy configuration and management. This ease of use reduces the time required for installation and setup, enabling quick deployment in field operations. Additionally, remote management capabilities enhance operational efficiency, allowing users to monitor device performance and make adjustments from anywhere.

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In conclusion, the Digi NS9215 is a robust networking device designed for a wide range of industrial applications. Its multi-protocol support, reliability, security features, user-friendly interface, and scalability make it a valuable addition to any industrial network infrastructure, delivering performance and efficiency that businesses can depend on for critical operations.