PDF AM7992B Data sheet ( Hoja de datos )

Número de pieza	AM7992B
Descripción	Serial Interface Adapter (SIA)
Fabricantes	Advanced Micro Devices
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No Preview Available ! FINAL 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 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, BLOCK DIAGRAM Receive Data (RX) Receive Clock (RCLK) Manchester Decoder 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) 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. Data Receiver Receive+ Carrier Present (RENA) Carrier Detect Noise Reject Filter Receive– Collision (CLSN) Collision Detect Transmit Data (TX) Transmit Enable (TENA) Transmit Clock (TCLK) 20 MHz Publication# 03378 Rev: I Amendment/0 Issue Date: May 1993 Manchester Encoder XTAL1 Crystal OSC XTAL2 Noise Reject Filter Collision+ Collision– Transmit+ Transmit– 03378I-1 1 1 page X1, X2 Biased Crystal Oscillator (Input) X1 is the input and X2 is the bypass port. When con- nected for crystal operation, the system clock that ap- pears at TCLK is half the frequency of the crystal oscillator. X1 may be driven from an external source of two times the data rate. RF Frequency Setting Voltage-Controlled Oscillator (VCO) Loop Filter (Output) This loop ﬁlter output is a reference voltage for the re- ceive path phase detector. It also is a reference for tim- ing noise immunity circuits in the collision and receive enable path. Nominal reference VCO gain is 1.25 TCLK frequency MHz/V. PF Receive Path VCO Phase-Locked Loop Filter (Input) This loop ﬁlter input is the control for receive path loop damping. Frequency of the receive VCO is internally lim- ited to transmit frequency ±12%. Nominal receive VCO gain is 0.25 reference VCO gain MHz/V. TEST Test Control (Input) A static input that is connected to VCC for Am7992B/ Am7990 operation and to ground for testing of Receive± path threshold and RCLK output HIGH parameters. When TEST is grounded, RX is enabled and RCLK is enabled except during clock acquisition, when RCLK is HIGH. GND1 High Current Ground GND2 Logic Ground GND3 Voltage-Controlled Oscillator Ground VCC1 High Current and Logic Supply VCC2 Voltage-Controlled Oscillator Supply Am7992B 5 5 Page AMD APPLICATION ETHERNET Local CPU Local Memory Local Bus AUI – Attachment Unit Interface DTE – Data Terminal Equipment MAU – Medium Attachment Unit CHEAPERNET Local CPU Local Memory DTE AUI Cable Am7990 LANCE Am7992B SIA MAU Am7996 Transceiver TAP Power Supply DTE Am7990 LANCE Am7992B SIA Am7996 Transceiver ETHERNET COAX RG58 BNC “T” Local Bus Power Supply Figure 7. Typical ETHERNET Node 03378I-11 Am7992B 11 11 Page

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