PEB2085 SIEMENS [Siemens Semiconductor Group], PEB2085 Datasheet - Page 41

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

Timing Mode 0 (SPM = 0)
In timing mode 0 the SLD operates in master mode and the SSI (Serial Port A) is operational;
pin SCA/FSD delivers a 128-kHz clock (SCA). The IOM, SLD and SSI interface frame begin is
at the same point in time i.e. at the rising edge of FSC1,2 (ADF1:FC2,1=0).
In TE mode, it is mandatory to program timing mode 0. The polarity of the symmetrical 8-kHz
output signals FSC1 and FSC2 can be independently selected via ADF1:FC2, 1.
In LT-T and LT-S modes, timing mode 0 may be programmed if the SLD master mode and/
or the SSI interface is required.
In these cases FSC1 and FSC2 (inputs) should both be connected to the same 8-kHz frame
sync signal (see figure 14).
Figure 14
IOM
Semiconductor Group
®
-1 Interface Signals/Timing Mode 0
(ADF1 : FC2,1 = 00)
FSC (Syst.)
CLK (Syst.)
FSC1/2
ISAC -S
IOM
Compatible
Communications
Controller
R
R
FSC2
FSC1
IDP0
IDP1
DCL
SLD/SSI Frames
IOM
41
R
IOM -2
IOM -2
Frame
R
R
IDP1
IDP0
DCL
FSC1/2
IOM
Compatible
Controller
R
ISAC -S
Functional Description
R
TE Mode
Timing Mode 0
LT-T, LT-S Mode
Timing Mode 0
ITS00853