PSB2186 Datasheet, PDF (194/240 Pages) Siemens Semiconductor Group – ISDN Subscriber Access Controller for Terminals

Low Level Controller
– HDLC-frame transmission.
– Programming of TEI and SAPI values.
– HDLC-transceiver control.
– Local test loop switching.
The LLC assumes that the ISAC-S TE is operating in an IOM-2 TE configuration.
In addition to the ISAC-S TE standard functions supporting the ISDN-basic access, the ISAC-S
TE 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
6.2.1 Layer-1 Related Functions
Mnemonic
ActL1_SBC
DeaL1_SBD
ArlL1_SBC
EnaClk_SBC
InitL1_SBC
ResL1_SBC
Purpose
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
InitLay2_ICC
Loop_ICC
ResetHDLC_ICC
RecReady_ICC
SendFrame_ICC
StoreSAPI_ICC
StoreTEI_ICC
Purpose
HDLC-controller initialization.
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.
Int_ICC
Rx_ICC
Handling of XPR, RSC, TIN and EXI interrupts.
Handling of RPF and RME interrupts.
Semiconductor Group
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