IA8044/IA8344
SDLC COMMUNICATIONS CONTROLLER
Data Sheet
Frame Format Options
Frame Option
Standard SDLC
FLEXIBLE Mode
Standard SDLC
AUTO Mode
No Control Field
FLEXIBLE Mode
No Control Field
No Address Field
FLEXIBLE Mode
No FCS Field
NFCS
NB
AM
Frame Format
0
0
0
Fl Ad Co Inf FCS Fl
Fl Ad Co Inf FCS Fl
Fl Ad Inf FCS Fl
0
0
0
1
1
1
0
1
0
Fl Inf FCS Fl
1
1
0
0
0
1
Fl Ad Co Inf Fl
Fl Ad Co Inf Fl
FLEXIBLE Mode
No FCS Field
AUTO Mode
No Control Field
No FCS Field
FLEXIBLE Mode
No Control Field
No Address Field
No FCS Field
1
1
1
1
1
0
Fl Ad Inf Fl
Fl Inf Fl
FLEXIBLE Mode
Fl -> Flag
Ad -> Address Field
Co -> Control Field
Inf -> Information Field
FCS -> Frame Check Sequence
HDLC Restrictions
The IA8044/IA8344 supports a subset of the HDLC protocol. The differences include the
restriction by the IA8044/IA8344 of the serial data to be in 8-bit increments. In contrast HDLC
allows for any number of bits in the information field. HDLC provides an unlimited address field
and an extended frame number sequencing. HDLC does not support loop configuration.
SIU Details
The SIU is composed of two functional blocks with each having several sub blocks. The two blocks
are called the bit processor (BIP) and the byte processor (BYP).
Copyright 2003
innovASIC
ENG210010112-00
www.innovasic.com
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