SCD243110QCD

Product Summary

The SCD243110QCD is a 4-channel synchronous/asynchronous communications controller specifically designed to reduce host-system processing overhead and increase efficiency in a wide variety of communications applications. The SCD243110QCD is packaged in a 100-pin MQFP, and offers eight clock/modem pins per channel. The device has four fully independent serial channels that support asynchronous, asynchronous-HDLC, and bit-synchronous (HDLC/SDLC) protocols. The SCD243110QCD is based on a proprietary on-chip RISC processor that performs all time-critical, low-level tasks that are otherwise performed by the host system. The SCD243110QCD boosts system efficiency with on-chip DMA, on-chip FIFOs, intelligent vectored interrupts, and intelligent protocol processing. The on-chip DMA controller provides "fire-andforget transmit" support — the host need only inform the CD2431 of the location of the packet to be sent. Similarly, on receive, the SCD243110QCD automatically receives a complete packet with no host intervention or assistance required.

Parametrics

SCD243110QCD absolute maximum ratings: (1)Operating ambient temperature (TA):0℃ to 70℃; (2)Storage temperature: -65℃ to 150℃; (3)All voltages with respect to ground: -0.5 V to VCC +0.5 V (volts); (4)Supply voltage (VCC): +7.0 V; (5)Power dissipation: 0.25 W (watt).

Features

SCD243110QCD features: (1)Four full-duplex multi-protocol channels, each running up to 134.4 kbits/second (with CLK =35 MHz); (2)Supports async, async-HDLC (high-level data link control), and HDLC/SDLC (synchronous data link control; non-multidrop) on all channels; (3)32-bit address, 16-bit data, double-buffered DMA controller for each transmitter and receiver; two independent bit-rate generators per channel for transmit and receive; (4)On-chip NRZ (nonreturn-to-zero), NRZI (nonreturn-to-zero inverted), and Manchester data encoding and decoding; (5)DPLL (digital phase locked loop) on each receiver; (6)Two independent timers per channel PPP (Point-to-Point Protocol) Features: Supports data link level — RFC-1661; Supports dual async control character maps (32 control characters); (7)RFC-1662 Async-HDLC Features: Compatible with ISO 3309/4335 Addendum 1; Automatic insertion and deletion of control/ escape characters and bit complements; Automatic generation and detection of 16-bit FCS (frame check sequence); (8)MNP 4 V.42 Features: AppleTalk Remote Access Protocol 1.0/2.0; (9)SLIP Features: Supports data link level — RFC-1055 HDLC/SDLC.

Diagrams