The IIS Chip Gallery

LLC (1993)

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by

Olver Dreer, Alex Hueber, Matthias Neeracher

Main Details

Application	Industrial
Technology	1200
Manufacturer	VLSI Tech
Type	Semester Thesis
Package	PGA84
Dimensions	6200μm x 3200μm
Gates	8 kGE
Voltage	5 V
Clock	16 MHz

Description

LLC (Localtalk Link access Controller) ASIC was developed for the needs of VPP - Versatile Printing and Plotting group of the ETH computer center. LLC implements tha Localtalk Link Access Protocol layer of an Apple Talk implementation for IBM PC compatible personal computers:

• Packet collisions are detected and packets are retransmitted.
• If link is bust, packets are deferred for a load dependent backoff intervall.
• Desired packets are received and queued.

Outgoing and incoming packets are buffered in an external 256K DRAM, with host configurable buffer sizes. LLC may be configured to listen to any combination of network addresses, making it suitable for traffic analysis on a network.

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