peb2256 Infineon Technologies Corporation, peb2256 Datasheet - Page 259
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peb2256
Manufacturer Part Number
peb2256
Description
E1/t1/j1 Framer And Line Interface Component For Long And Short Haul Applications
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEB2256.pdf
(490 pages)
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DXSS
Clock Mode Register 2 (Read/Write)
Value after reset: 00
CMR2
DCOXC
DCF
Data Sheet
7
DCO-X Synchronization Clock Source
0 =
1 =
DCO-X Center-Frequency Enable
0 =
1 =
DCO-R Center- Frequency Disabled
0 =
1 =
H
The DCO-X circuitry synchronizes to the internal reference
clock which is sourced by SCLKX/R or RCLK. Since there are
many reference clock opportunities the following internal
prioritizing in descending order from left to right is realized:
LIM1.RL > CMR1.DXSS > LIM2.ELT > current working clock of
transmit system interface.
If one of these bits is set the corresponding reference clock is
taken.
DCO-X synchronizes to an external reference clock provided
on pin XP(A to D) pin function TCLK, if no remote loop is active.
TCLK is selected by PC(4:1).XPC(3:0) = 0011
The center function of the DCO-X circuitry is disabled.
The center function of the DCO-X circuitry is enabled.
DCO-X centers to 2.048 MHz related to the master clock
reference (MCLK), if reference clock (e.g. SCLKX) is missing.
The DCO-R circuitry is frequency centered
- in master mode if no 2.048 MHz reference clock on pin SYNC
is provided or
- in slave mode if a loss-of-signal occurs in combination with no
2.048 MHz clock on pin SYNC or
- a gapped clock is provided on pin RCLKI and this clock is
inactive or stopped.
The center function of the DCO-R circuitry is disabled. The
generated clock (DCO-R) is frequency frozen in that moment
when no clock is available on pin SYNC or pin RCLKI. The
DCO-R circuitry starts synchronization as soon as a clock
appears on pins SYNC or RCLKI.
DCOXC
DCF
259
IRSP
IRSC
IXSP
B
FALC56 V1.2
.
IXSC
E1 Registers
0
PEB 2256
2002-08-27
(45)
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