IA8044 Datasheet, PDF (36/49 Pages) InnovASIC, Inc – SDLC COMMUNICATIONS CONTROLLER

IA8044/IA8344
SDLC COMMUNICATIONS CONTROLLER
Data Sheet
Frame Format Options
Frame Option
NFCS NB
Standard SDLC
FLEXIBLE Mode
0
0
Standard SDLC
AUTO Mode
0
0
No Control Field
FLEXIBLE Mode
0
1
No Control Field
No Address Field
0
1
FLEXIBLE Mode
No FCS Field
FLEXIBLE Mode
1
0
No FCS Field
AUTO Mode
1
0
No Control Field
No FCS Field
1
1
FLEXIBLE Mode
No Control Field
No Address Field
No FCS Field
1
1
FLEXIBLE Mode
Fl -> Flag
Ad -> Address Field
Co -> Control Field
Inf -> Information Field
FCS -> Frame Check Sequence
AM
Frame Format
0
Fl Ad Co Inf FCS Fl
1
Fl Ad Co Inf FCS Fl
1
Fl Ad Inf FCS Fl
0
Fl Inf FCS Fl
0
Fl Ad Co Inf Fl
1
Fl Ad Co Inf Fl
1
Fl Ad Inf Fl
0
Fl Inf Fl
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
The End of Obsolescence™
ENG210010112-00
Page 36 of 49
www.innovasic.com
Customer Support:
1-888-824-4184