PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 46

• Manufacturer Part Number: PEF2091
• Description: ICs for Communications(ISDN Echocancellation Circuit)
• Manufacturer: Siemens Semiconductor Group

Semiconductor Group
Pin No.
P-LCC-44
11
32
37
2.2.2.9
18
Miscellaneous Function Pins
Pin No.
T-QFP64
M-QFP64
23
54
60
35
Symbol
XIN
CLS
MCLK
RST
Input (I)
Output (O)
I
O
O
O
46
Function
Crystal IN: External 15.36-MHz clock
signal or 15.36-MHz crystal is
connected. In case a crystal is
connected, suitable load capacitances
should be connected in parallel. Their
value depends on the crystal chosen
and board Layout. See "Oscillator
Circuit and Crystal", page 252 for
details
Clock Signal: In the NT modes this
clock is synchronized to U-Interface.
Used to synchronize external PLL or to
clock S-Interface devices. In the NT,
NT-Auto Activation, COT and TE
modes a 7.68 MHz clock is provided
on this pin.
In the PBX- and in the LT-RP modes a
512 kHz clock is provided.
In the NT-RP mode a 15.36 MHz clock
is provided (not synchronized to
U-Interface).
In the LT mode the clock on CLS is not
defined and should therefore be left
unconnected.
Microprocessor clock output
(Multiplexed, demultiplexed and serial
modes): provided with four
programmable clock rates: 7.68 MHz,
3.84 MHz, 1.92 MHz and 0.96 MHz.
Reset output (Multiplexed,
demultiplexed and serial modes): Low
active.
Pin Descriptions
Data Sheet 01.99
PEB 2091
PEF 2091