IA8044/IA8344
Data Sheet
SDLC Communications Controller
March 30, 2010
The no-control field format is only supported by the FLEXIBLE mode. In this format, TCB and
RCB are not used and the information field starts immediately after the address field. A control
field may still be used in the frame but the SIU will treat it as a byte of the information field.
The no-control field and no-address field formats are supported only by the FLEXIBLE mode. In
this format STAD, TCB, and RCB are not used and the information field starts immediately after
the opening flag. This option can only be used with the no-control field option. A control field
and address field may still be used in the frame but the SIU will treat each as a byte of the
information field.
The no FCS field format prevents an FCS from being generated during transmission or being
checked during reception. This option may be used in conjunction with the other frame format
options. This option will work with both FLEXIBLE and AUTO modes. In AUTO mode, it
could cause protocol violations. An FCS field may still be used in the frame but the SIU will treat
it as a byte of the information field.
All the possible Frame Format combinations are presented in Table 47, along with the bit settings
that select a given format.
Table 47. Frame Format Options
Frame Option NFCS NB AM
Frame Format
Inf
Standard
SDLC
0
0
0
Fl
Ad
Co
FCS
Fl
Fl
FLEXIBLE
Mode
Standard
SDLC
AUTO Mode
No-Control
Field
0
0
0
1
1
1
Fl
Fl
Ad
Ad
Co
Inf
Inf
FCS
Fl
FCS
FLEXIBLE
Mode
No-Control
Field
0
1
0
Fl
Inf
FCS
Fl
No-Address
Field
FLEXIBLE
Mode
No-FCS Field
FLEXIBLE
Mode
No-FCS Field
AUTO Mode
1
1
0
0
0
1
Fl
Fl
Ad
Ad
Co
Co
Inf
Inf
Fl
Fl
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