DP8390DV

Controllers Overview

The DP8390DV is a Network Interface Controller (NIC) designed for CSMA/CD local area networks, including Ethernet and Thin Ethernet. It implements IEEE 802.3 MAC layer functions with dual 16-bit DMA channels and a 16-byte internal FIFO. The device interfaces with 8-, 16-, or 32-bit microprocessor systems using a single 5V supply. Key capabilities include physical, multicast, and broadcast address filtering, three levels of loopback diagnostics, and network statistics storage.

Controllers Feature Summary

• Implements complete IEEE 802.3 Media Access Control (MAC) layer functions for packet transmission and reception.
• Features dual independent 16-bit DMA channels for efficient buffer management between the NIC FIFO and system memory.
• Supports flexible addressing modes including physical, multicast, broadcast, and promiscuous filtering.
• Integrates CRC generation/checking logic and collision recovery mechanisms within the protocol PLA.

Controllers Applications

• Ethernet Local Area Network node electronics implementation
• Thin Ethernet (Cheapernet) interface controller design
• StarLAN network interface integration

Controllers Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm package type matches the required DIP configuration. Check for obsolete status indicators as this part may be discontinued. Ensure compatibility with existing system bus timing requirements before procurement.

Controllers Selection Notes

Select this component for systems requiring standalone IEEE 802.3 MAC functionality without external arbitration logic. Pair with DP8391 Serial Network Interface and DP8392 Coaxial Transceiver Interface for a complete three-chip solution. Evaluate memory buffer ring sizing based on expected network load and packet sizes.

Controllers Part Context

This device belongs to the DP8390 family of Network Interface Controllers. It serves as the central MAC processor in a three-chip set that includes the DP8391 SNI and DP8392 CTI. The DP8390D variant specifically denotes the plastic chip carrier or DIP package options available within this product line.

Controllers Replacement Considerations

DP8390DN

Controllers FAQ

How does the DP8390DV handle multicast addresses?

It filters multicast addresses using a standard hashing algorithm that maps all multicast addresses into a 6-bit value. This value indexes a 64-bit array in the Multicast Address Register Array to determine acceptance.

What is the function of the Receive Buffer Ring?

The Receive Buffer Ring consists of contiguous fixed-length 256-byte buffers used by the Local DMA channel to store received packets. It manages buffer linking for long packets and prevents overwriting unread data via a Boundary Pointer.

Can the two DMA channels operate simultaneously?

Yes, the Local DMA and Remote DMA operations can be interleaved. The Local DMA has highest priority for internal FIFO transfers, while the Remote DMA handles transfers between buffer memory and host system memory.