CD2481 Datasheet, PDF (10/222 Pages) Intel Corporation – Programmable Four-Channel Communications Controller

CD2481 — Programmable Four-Channel Communications Controller
• Enhanced features for UNIX^ environment
— Character expansion in transmit (for example, sending <LF> expands to <CR> <LF>
automatically)
— Programmable translation of receiving character with error to different pattern
— Flow-control transparency and LNext
MNP ^4 V.42 Features
• AppleTalk^ Remote Access protocol 1.0/2.0
SLIP Features
• Supports data link level — RFC-1055
Bisync Features
• Supports ASCII or EBCDIC encoding
• Supports transparent Bisync
• Recognition of all special characters enabling:
— Block separation
— CRC generation and validation
• Chaining of long receive blocks into multiple buffers
X.21 Features
• Full support for X.21 protocol
• Detection of steady-state conditions
• Transmission of steady-state conditions synchronized to modem lead
• Programmable SYN character, 1 or 2 SYN detect option
• Idle in any line condition
Programmable Sync Features
• Programmable for 5-, 6-, 7-, and 8-bit characters
• User-defined SYN (2) and EOF (4) characters
• Allows use in almost any character-sync environment
DMA Controller Features
• Dual configuration register sets to reduce realtime constraints
• Append (async only) and Block mode DMA
• Chain/unchain long frames into multiple buffers
• 32-bit address and 8- or 16-bit data transfer
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Datasheet