M E M O R Y C O N T RO L L E R

Address connectivity

A d d r e s s c o n n e c t i v i t y

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Memory banks constructed from 8-bit or non-byte- partitioned memory devices

For memory banks constructed from 8-bit or non-byte-partitioned memory devices, it is important that the byte lane state (PB) bit is cleared to 0 within the respective memory bank control register. This forces all data_mask lines high during a read access, as the byte lane selects are connected to the device write enables.

The next figure shows 8-bit memory configuring memory banks that are 8-, 16-, and 32-bits wide. In each of these configurations, the data_mask[3:0] signals are connected to write enable (WE_n) inputs of each 8-bit memory. The st_we_n signal from the memory controller is not used.

For write transfers, the appropriate data_mask[3:0] byte lane signals are asserted low, and direct the data to the addressed bytes.

For read transfers, all data_mask[3:0] signals are deasserted high, enabling the external bus to be defined for at least the width of the accessed memory.

addr[22:2]

 

 

 

 

 

 

 

 

 

 

 

 

cs[n]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

st_oe_n

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A[20:0]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CE_n

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OE_n

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

data_mask[3]

 

WE_n

data_mask[2]

 

 

 

data[31:24]

 

IO[7:0]

data[23:16]

 

 

 

addr[21:1]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

cs[n]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

st_oe_n

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A[20:0] CE_n OE_n WE_n IO[7:0]

data_mask[1]

data[15:8]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A[20:0]

 

 

 

 

A[20:0]

 

 

 

 

 

 

CE_n

 

 

 

 

CE_n

 

 

 

 

 

 

OE_n

 

 

 

 

OE_n

 

 

 

 

 

 

WE_n

data_mask[0]

 

WE_n

 

 

 

IO[7:0]

data[7:0]

 

IO[7:0]

 

 

 

 

 

 

 

 

 

32-bit bank consisting of four 8-bit devices

 

 

 

 

 

A[20:0]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CE_n

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OE_n

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

data_mask[3]

 

WE_n

data_mask[2]

 

 

 

data[31:24]

 

IO[7:0]

data[23:16]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A[20:0]

addr[20:0]

 

A[20:0]

 

CE_n

cs[n]

 

CE_n

 

OE_n

st_oe_n

 

OE_n

 

WE_n

data_mask[3]

 

WE_n

 

IO[7:0]

data[31:24]

 

IO[7:0]

 

 

 

 

 

16-bit bank consisting of two 8-bit devices

8-bit bank consisting of one 8-bit device

222Hardware Reference NS9215

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Digi NS9215 manual D r e s s c o n n e c t i v i t y

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.

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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.