CD2231 Intel Corporation, CD2231 Datasheet - Page 9



Manufacturer Part Number
CD2231 Intelligent Two-channel Lan And Wan Communications Controller
Intel Corporation
PPP (Point-to-Point Protocol) Features
MNP 4 V.42 Features
SLIP Features
HDLC/SDLC (Non-Multidrop) Features
Asynchronous Features
Two full-duplex multi-protocol channels, each capable of up to 256 kbits/second (230.4 kbps
in async modes) at 35-MHz CLK
Multi-protocol support: SLIP (serial-line interface protocol), MNP 4, async, async-HDLC
(high-level data link control), and HDLC/SDLC (synchronous data link control) on both
channels (does not support SDLC multi-drop applications)
Supports data link level — RFC-1661
Supports dual async control character maps
(32 control characters) — RFC-1662
Compatible with ISO 3309/4335 Addendum 1 (Async-HDLC)
Automatic insertion and deletion of control/escape characters and bit complements
Automatic generation and detection of 16-bit FCS (frame check sequence)
AppleTalk Remote Access Protocol 1.0/2.0
Supports data link level — RFC-1055
Four 8-bit or two 16-bit frame address matching
FCS generation and validation
Programmable number of leading-pad characters and flags
Supports shared flags on receive frames
User-programmable and automatic flow control modes
5- to 8-bit character plus optional parity
— In-band by XON/XOFF for both receive and transmit
— Out-of-band (hardware flow control) by RTS/CTS and DTR/DSR
— Line-break detection and generation
— Special-character and character-range recognition
— Special-character transmission
— Transmit delay
Intelligent Two-Channel LAN and WAN Communications Controller — CD2231

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