Low Level Controller
– HDLC frame transmission.
– Programming of TEI and SAPI values.
– HDLC transceiver control.
– Interrupt handling.
– Local test loop switching.
– B-Channel switching in IOM-1 configurations.
TE configurations in IOM-1 / IOM-2 mode and NT-S configurations (IOM-1 only) are supported.
In addition to the ISAC-S standard functions supporting the ISDN basic access, the ISAC-S
contains optional, terminal specific functions. These terminal specific functions (watchdog and
external awake) are not supported by this LLC.
6.2
Summary of LLC Functions
Layer 1 Related Functions
6.2.1
Mnemonic
Purpose
ActL1_SBC
DeaL1_SBD
ArlL1_SBC
EnaClk_SBC
InitL1_SBC
ResL1_SBC
Layer-1 activation.
Layer 1 deactivation.
Activation of a local loop.
Enable clocking in power down mode.
Layer-1 initialization and reset.
Layer-1 reset.
IntL1_SBC
Handling of CISQ interrupts.
The layer 1 related functions call DECODE_L1_STATUS to report a L1 status change to a
higher layer software.
6.2.2
HDLC Controller Related Functions
Mnemonic
Purpose
InitLay2_ICC
HDLC controller initialization.
Loop_ICC
Testloop activation at the serial outputs of the IOM interface.
HDLC transceiver reset.
Setting the HDLC receiver ready or not ready.
HDLC frame transmission.
SAPI programming.
TEI programming.
ResetHDLC_ICC
RecReady_ICC
SendFrame_ICC
StoreSAPI_ICC
StoreTEI_ICC
SwitchB_ICC
B-channel switching to SSI or SLD interface in IOM1 configurations.
Int_ICC
Rx_ICC
Handling of XPR, RSC, TIN and EXI interrupts.
Handling of RPF and RME interrupts.
Semiconductor Group
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INFINEON [ Infineon ]
