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

MemoryManagement Unit (MMU)

Translation

 

 

 

 

 

 

sequence for tiny

 

Modified virtual address

 

 

 

page references

 

 

 

 

31

2019

10 9

0

 

 

 

 

 

 

 

 

Table index

 

Level two

 

 

Page index

 

 

table index

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Translation table base

31

14 13

0

Translation base

31

 

14 13

2

1 0

 

Translation base

Table index

0 0

31

First-level descriptor

 

 

 

 

 

1211

8

5 4

3

2

1 0

Fine page table base address

Domain

1

1 1

31

12 11

2 1 0

Fine page table base address

L2 table index

0 0

31

Second-level descriptor

10 9 6 5 4 3 2 1 0

Page base address

AP C B 1 1

31

Physical address

10 9

0

Page base address

Page index

 

Page translation involves one additional step beyond that of a section translation.

 

The first-level descriptor is the fine page table descriptor; this points to the first-

 

level descriptor.

 

Note: The domain specified in the first-level description and access permissions

 

specified in the first-level description together determine whether the access

 

has permissions to proceed. See “Domain access control” on page 121 for

 

more information.

Subpages

You can define access permissions for subpages of small and large pages. If, during a

 

page table walk, a small or large page has a different subpage permission, only the

 

subpage being accessed is written into the TLB. For example, a 16 KB (large page)

 

subpage entry is written into the TLB if the subpage permission differs, and a 64 KB

 

entry is put in the TLB if the subpage permissions are identical.

118Hardware Reference NS9215

Page 118
Image 118
Digi NS9215 manual Translation Sequence for tiny, References, Level descriptor, More information, Subpages

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.

One of the standout features of the Digi NS9215 is its multi-protocol support. It is capable of handling various communication protocols, including Ethernet, Serial, and Wireless, making it ideal for integration into heterogeneous environments. This flexibility enables users to connect legacy devices to modern networks seamlessly, facilitating smoother data communication across different platforms.

The NS9215 is equipped with powerful processing capabilities, featuring an integrated processor that ensures efficient data handling. This enables the device to perform complex data tasks without compromising performance. Its high-speed connectivity options also allow for rapid data transmission, which is crucial for real-time applications in industrial settings.

Another critical characteristic of the Digi NS9215 is its reliability in harsh environments. Built to withstand extreme temperatures, humidity, and electrical interference, this device assures consistent operation even in challenging conditions. Its rugged design minimizes the risk of failure, making it suitable for deployment in various industrial environments.

Security is a top priority for the Digi NS9215. It comes with advanced security features that protect sensitive data during transmission and prevent unauthorized access. Employing encryption protocols and secure authentication methods, the NS9215 ensures that data integrity and confidentiality are maintained throughout its operation.

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.

Furthermore, the NS9215 supports extensive scalability options. As organizations grow and evolve, the ability to scale up or adapt the networking capabilities becomes essential. With its modular design, the NS9215 can easily accommodate additional devices and protocols, ensuring longevity and continued relevance in a rapidly changing technological landscape.

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.