PEB 2091
PEF 2091
Pin Descriptions
Pin No.
Pin No.
Symbol Input (I)
Function
P-LCC-44 T-QFP64
M-QFP64
Output (O)
®
2.2.1.3 IOM -2 Pins
31
53
DCL
I/O
I/O
Data clock: Clock range 512 kHz to
4096 kHz.
30
52
FSC
Frame synchronization clock: The start
of the B1-channel in time-slot 0 is
marked. FSC = (1) for one DCL-period
indicates a superframe marker. FSC =
(1) for at least two DCL-periods marks
a standard frame.
26
27
45
46
DIN
I
Data in: Input of IOM®-2 data
synchronous to DCL-clock.
Corresponds to DD (data downstream)
in LT and DU (data upstream) in NT
applications.
Data out: Output of IOM®-2 data
synchronous to DCL-clock.
Corresponds to DD (data downstream)
in NT and DU (data upstream) in LT
applications.
DOUT
O
®
2.2.1.4 IOM -2 Control Pins
17
32
DOD
I
DOUT open drain: Select open drain
with DOD = (1) (external pull-up
resistor required) and tristate with
DOD = (0).
34
57
MTO
I
Monitor procedure time-out: Disables
the internal 6 ms monitor time-out
when set to (1). Internal pull-down
resistor.
Semiconductor Group
35
Data Sheet 01.99