PEB2085 SIEMENS [Siemens Semiconductor Group], PEB2085 Datasheet - Page 283

• Manufacturer Part Number: PEB2085
• Description: ISDN SubscribernAccess Controller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Low Level Controller
StoreSAPI_ICC ()
StoreSAPI_ICC is used to program a SAPI value in register SAP1 or SAP2 depending on the
function argument value.
RecReady_ICC ()
Sets HDLC receiver ready or not ready depending on the function argument value.
ResetHDLC_ICC ()
ResetHDLC_ICC resets the HDLC controller. Status flags of the local variable ’pt’ indicating
any on-going data transmissions or receptions are reset and memory buffers are released.
SendFrame_ICC ()
SendFrame_ICC initiates the transmission of HDLC frames (S, U, I, UI frames).
A frame can not be sent if the transmit path is still in use, i.e. if the previous transmission is not
finished, if the timer recovery state is indicated (only for I frames) or if the XFIFO is blocked
(STAR:XFW bit).
If the transmission is begun the interrupt handler (Int_ICC) will handle subsequent tasks, for
example shifting remaining data bytes into the XFIFO or calling the MMU to release the
memory buffer.
Loop_ICC ()
Switches testloop at the IOM interface on or off, i.e. connects internally the data upstream and
data downstream lines. This is achieved through setting/resetting the TLP bit in register SPCR.
If the layer-1 part does not deliver clocks while in the deactivated state the clocks will be
enabled when the loop is switched on by means of EnableClk_BASIC. In the Siemens Low
Level Controllers for BASIC access ICs EnableClk_BASIC is a function pointer which
addresses EnaClk_SBC if an ISAC-S or SBC(X) is used. When the loop is switched off the
layer 1 part will return to its normal deactivated state.
SwitchB_ICC ()
Switches the B-channels in IOM1 configurations to the SSI or SLD interface or back to
network. Register SPCR is used.
Semiconductor Group
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