peb2256 Infineon Technologies Corporation, peb2256 Datasheet - Page 59
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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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FALC56 V1.2
PEB 2256
Functional Description E1/T1/J1
3.3.3
Master Clocking Unit
The FALC56 provides a flexible clocking unit, which references to any clock in the range
of 1.02 to 20 MHz supplied on pin MCLK.
The clocking unit has to be tuned to the selected reference frequency by setting the
global clock mode registers GCM(6:1) accordingly.
The calculation formulas for the appropriate register settings can be found in
Chapter 9.2
on
page 217
or
Chapter 10.2
on
page
334. A calculation tool is available
to evaluate the required register settings automatically (see
Chapter 13.3
on
page
481).
All required clocks for E1 or T1/J1 operation are generated by this circuit internally. The
global setting depends only on the selected master clock frequency and is the same for
E1 and T1/J1 because both clock rates are provided simultaneously.
To meet the E1 requirements the MCLK reference clock must have an accuracy of better
than ± 32 ppm. The synthesized clock can be controlled on pins CLK1, CLK2, RCLK,
SCLKR and XCLK.
.
E1 Clocks
MCLK
T1 / J1
Flexible Master Clock Unit
Clocks
GCM1...GCM6
F0116
Figure 12
Flexible Master Clock Unit
Data Sheet
59
2002-08-27
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