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AM7992BPC Arkusz danych(PDF) 1 Page - Advanced Micro Devices |
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1 / 27 page FINAL Publication# 03378 Rev: I Amendment/0 Issue Date: May 1993 1 Am7992B Serial Interface Adapter (SIA) DISTINCTIVE CHARACTERISTICS s Compatible with lEEE 802.3/Ethernet/Cheapernet specifications s Crystal/TTL oscillator-controlled Manchester encoder s Manchester decoder acquires clock and data within four bit times with an accuracy of ±3 ns s Guaranteed carrier and collision detection squelch threshold limits — Carrier/collision detected for inputs greater than –275 mV — No carrier/collision for inputs less than –175 mV s Input signal conditioning rejects transient noise — Transients <10 ns for collision detector inputs — Transients <20 ns for carrier detector inputs s Receiver decodes Manchester data with worst case ±19 ns of clock jitter (at 10 MHz) s TTL-compatible host interface s Transmit accuracy +0.01% (without adjustments) GENERAL DESCRIPTION The Am7992B Serial Interface Adapter (SIA) is a Manchester encoder/decoder compatible with IEEE 802.3, Cheapernet, and Ethernet specifications. In an IEEE 802.3/Ethernet application, the Am7992B inter- faces the Am7990 Local Area Network Controller for Ethernet (LANCE) to the Ethernet transceiver device, acquires clock and data within four bit times, and de- codes Manchester data with worst case ±19 ns phase jitter at 10 MHz. SIA provides both guaranteed signal threshold limits and transient noise suppression cir- cuitry in both data and collision paths to minimize false start conditions. BLOCK DIAGRAM 03378I-1 Manchester Decoder Data Receiver Noise Reject Filter Carrier Detect Noise Reject Filter Collision Detect Manchester Encoder Crystal OSC Receive Data (RX) Receive Clock (RCLK) Carrier Present (RENA) Collision (CLSN) Transmit Data (TX) Transmit Enable (TENA) Transmit Clock (TCLK) 20 MHz XTAL 1 XTAL 2 Receive+ Receive– Collision+ Transmit+ Transmit– Collision– |
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