
CD2481
—
Programmable Four-Channel Communications Controller
10
Datasheet
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