Low Level Controller
OPERATING SYSTEM and
Higher Level Protocol Software
Received
Frames
Status/
Error Messages
MMU Service
Requests
FUNCTION CALLS
. . .
Interrupt Server
Driver Functions
SBC Part
ICC Part
SBC Part
ICC Part
Layer-1
Functions
HDLC Controller
related Functions
Evaluation of Interrupt Cause
ISAC R -S TE
ITS02392
Figure 112
LLC Architecture
The ISAC-S LLC supports following standard functions:
– Initialization of the SBC (layer 1) part.
– Activation of layer 1.
– Deactivation of layer 1.
HDLC controller initialization.
The following HDLC controller message transfer modes are supported:
automode:
non-automode:
full two byte address compare, LAPD support.
full two byte address compare.
transparent mode 3: high byte address compare; called 'TRANSPARENT' mode in
the LLC.
transparent mode 2: no address compare; called 'EXTENDED TRANSPARENT'
mode in the LLC.
HDLC framing with two byte address field is assumed.
Semiconductor Group
273
INFINEON [ Infineon ]
