psf2115 ETC-unknow, psf2115 Datasheet - Page 94

• Manufacturer Part Number: psf2115
• Description: Isdn Adapter Circuit Ipac
• Manufacturer: ETC-unknow

Semiconductor Group
2.5.8
In addition to the standard functions supporting the ISDN basic access, the IPAC
contains optional functions, useful in various terminal configurations.
The terminal specific functions are enabled by setting bit TSF (STCR register) to “1”. This
has two effects:
• In TE mode the MODE1/EAW line is defined as External Awake input, but additionally
• Second, the interrupts SAW and WOV (EXIRD register) are enabled:
ADF1
The WTC1 and WTC2 bits have to be successively written in the following manner within
128 ms:
1.
2.
As a result the watchdog timer is reset and restarted. Otherwise a WOV is generated.
Deactivating the terminal specific functions is only possible with a hardware reset.
Having enabled the terminal specific functions via TSF = 1, the user can make the IPAC
generate a reset signal by programming the Reset Source Select RSS bit (CIX0
register), as follows:
0
this function is only enabled by setting STCR:TSF=1
– SAW (Subscriber Awake) generated by a falling edge on the EAW line
– WOV (Watchdog Timer Overflow) generated by the watchdog timer. This occurs
when the processor fails to write two consecutive bit patterns in ADF1:
A reset signal is generated as a result of
– a falling edge on the EAW line (subscriber awake)
– a C/I code change (exchange awake).
– layer-1 part leaves power down state and supplies DCL and FSC clocks.
A falling edge on the EAW line also forces the DU line of the
IOM interface to zero.
Note: In case the layer-1 part of the IPAC is switched off (CONF:TEM=1), a falling
A corresponding interrupt status (CIC or SAW) is also generated.
Terminal Specific Functions (TE mode only)
edge on EAW should normally induce the attached layer-1 device to leave
the power down state and supply clocking to IPAC via DCL and FSC.
WTC1
1
0
WTC1
WTC2
0
1
WTC2
Watchdog Timer Control 1,0.
94
Functional Description
PSB 2115
PSF 2115
11.97