PSB21150FV14NT Infineon Technologies, PSB21150FV14NT Datasheet - Page 94
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PSB21150FV14NT
Manufacturer Part Number
PSB21150FV14NT
Description
Manufacturer
Infineon Technologies
Datasheet
1.PSB21150FV14NT.pdf
(270 pages)
Specifications of PSB21150FV14NT
Number Of Line Interfaces
1
Control Interface
HDLC
Lead Free Status / Rohs Status
Not Compliant
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IPAC-X
PSB/PSF 21150
Description of Functional Blocks
3.7
IOM-2 Interface
The IPAC-X supports the IOM-2 interface in linecard mode and in terminal mode with
single clock and double clock. The IOM-2 interface consists of four lines: FSC, DCL, DD
and DU. The rising edge of FSC indicates the start of an IOM-2 frame. The DCL and the
BCL clock signals synchronize the data transfer on both data lines DU and DD. The DCL
is twice the bit rate, the BCL rate is equal to the bit rate. The bits are shifted out with the
rising edge of the first DCL clock cycle and sampled at the falling edge of the second
clock cycle.
The IOM-2 interface can be enabled/disabled with the DIS_IOM bit in the IOM_CR
register.
TE Mode
A DCL signal and BCL signal (pin BCL/SCLK) output is provided and the FSC signal is
generated by the receive DPLL which synchronizes it to the received S/T frame.
The BCL clock together with the two serial data strobe signals (SDS1, SDS2) can be
used to connect time slot oriented standard devices to the IOM-2 interface. If the
transceiver is disabled (TR_CON.DIS_TR) the DCL and FSC pins become input and the
HDLC part can still work via IOM-2. In this case the clock mode bit (IOM_CR.CLKM)
selects between a double clock and a single clock input for DCL.
The clock rate/frequency of the IOM-2 signals in TE mode are:
DD, DU: 768 kbit/s
FSC (o): 8 kHz
DCL (o): 1536 kHz (double clock rate)
BCL (o):768 kHz (single clock rate)
Option - Transceiver disabled (DIS_TR = ’1’):
FSC (i): 8 kHz
DCL (i): 1536 ... 4096 kHz, in steps of 512 kHz (double clock rate)
LT-S, LT-T, NT, iNT Mode
The IOM-2 clock signals FSC and BCL are input.
In LT-T mode a 1536 kHz output clock synchronous to S is provided at pin SCLK which
can directly be connected to the DCL input. Internal clock dividers provide for generation
of an FSC or BCL output clock at pin FBOUT derived from DCL (see
Chapter
3.4).
DD, DU: data rate = DCL/2 kbit/s (LT-T mode)
FSC (i): 8 kHz
DCL (i): 512 ... 4096 kHz, in steps of 512 kHz (double clock rate)
SCLK (o):1536 kHz (LT-T mode), BCL derived via DCL/2 (LT-S/NT mode)
Note: In all modes the direction of the data lines DU and DD is not fix but depending on
the timeslot which can be seen in the figures below.
Data Sheet
94
2003-01-30
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