A E S D A T A E N C R Y P T I O N / D E C R Y P T I O N M O D U L E

AES DMA buffer descriptor

Bits

Used for

Values

 

 

 

 

[5:4]

Key size

00

128 bits

 

 

01

192 bits

 

 

10

256 bits

 

 

 

 

[6]

Additional authentication data (CCM

0

No additional data

 

mode only)

1

Additional data used

 

 

 

 

[9:7]

L-par (CCM mode only)

N/A

 

 

 

 

 

[10]

Reserved

N/A

 

 

 

 

 

[13:11]

M-par (CCM mode only)

N/A

 

 

 

 

 

[15:14]

Reserved

N/A

 

 

 

 

 

AES op code

Indicates the contents of the data buffer associated with this descriptor:

 

000

Non-AES memory-to-memory or external DMA mode

 

001

Key buffer

 

010

IV buffer

 

011

Nonce buffer (CCM mode only, 16 bytes fixed length)

 

100

Additional authentication data (CCM mode only)

 

101

Data to be encrypted or decrypted

WRAP (W) bit

The Wrap (W) bit, when set, tells the DMA controller that this is the last buffer

 

descriptor within the continuous list of descriptors. The next buffer descriptor is

found using the initial DMA channel buffer descriptor pointer. When the W bit is not set, the next buffer descriptor is found using an offset of 0x10 from the current buffer descriptor.

Interrupt (I) bit

Last (L) bit

Full (F) bit

The Interrupt bit, when set, tells the DMA controller to issue an interrupt to the CPU when the buffer is closed due to a normal channel completion. The interrupt occurs regardless of the normal completion interrupt enable configuration for the DMA channel.

The Last bit, when set, tells the DMA controller that this buffer descriptor is the last descriptor that completes an entire message frame. The DMA controller uses this bit to assert the normal channel completion status when the byte count reaches zero.

The Full bit, when set, indicates that the buffer descriptor is valid and can be processed by the DMA channel. The DMA channel clears this bit after completing the transfer(s).

358Hardware Reference NS9215

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Image 358
Digi NS9215 manual AES op code, Interrupt I bit Last L bit Full F bit

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.