PEF2256EV22NP Lantiq, PEF2256EV22NP Datasheet - Page 109

• Manufacturer Part Number: PEF2256EV22NP
• Manufacturer: Lantiq

Specifications of PEF2256EV22NP

• Number Of Transceivers: 1
• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Supplier Unconfirmed

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Writing of received data from XDI is controlled by SCLKX/R and SYPX/XMFS in
combination with the programmed offset values for the transmit time slot/clock slot
counters. Reading of stored data is controlled by the clock generated by DCO-X circuitry
or the externally generated TCLK and the transmit framer. With the de-jittered clock data
is read from the transmit elastic buffer and are forwarded to the transmitter. Reporting
and controlling of slips is done according to the receive direction. Positive/negative slips
are reported in interrupt status bits ISR4.XSP and ISR4.XSN. If the transmit buffer is
bypassed data is directly transferred to the transmitter.
The following table gives an overview of the transmit buffer operating modes.
Table 25
SIC1.XBS(1:0)
00
11
01
10
6.4.5
The analog transmitter includes a programmable pulse shaper to satisfy the
requirements of ITU-T I.431. The amplitude and shape of the transmit pulses are
completely programmable by registers XPM(2:0).
The transmitter requires an external step up transformer to drive the line.
Changes in the PCM mode bit (FMR1.PMOD) or write operations to the GCM5 or GCM6
Register may result in an enlarged pulse width on the transmit line interface, see
Chapter
Note: To achieve higher slew rates the pulse undershoot can be programmed in the 3
6.4.6
The transmit line monitor compares the transmit line current on XL1 and XL2 with an
on-chip transmit line current limiter. The monitor detects faults on the primary side of the
Data Sheet
Clock adaption between system clock (SCLKX) and internally generated transmit
route clock (XCLK).
Compensation of input wander and jitter.
Frame alignment between system frame and transmit route frame
Reporting and controlling of slips
and 4
registers XPM (2:0).
2.7.
Programmable Pulse Shaper (E1)
Transmit Line Monitor (E1)
th
Transmit Buffer Operating Modes (E1)
sub pulse fraction by setting LIM2.EOU and the corresponding bits in
Buffer Size
bypass
short buffer
1 frame
2 frames
109
TS Offset
programming
enabled
enabled
enabled
enabled
Functional Description E1
yes
yes
yes
Slip performance
no
Rev. 1.1, 2005-06-13
PEF 2256 H/E
FALC
®
56
rd