PEF2256 INFINEON [Infineon Technologies AG], PEF2256 Datasheet - Page 59

• Manufacturer Part Number: PEF2256
• Description: E1/T1/J1 Framer and Line Interface Component for Long- and Short-Haul Applications
• Manufacturer: INFINEON [Infineon Technologies AG]

3.3.3
The FALC
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(8:1) accordingly.
The calculation formulas for the appropriate register settings can be found in
Chapter 9.2
to evaluate the required register settings automatically (see
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.
.
Figure 11
User’s Manual
Hardware Description
MCLK
®
Master Clocking Unit
56 provides a flexible clocking unit, which references to any clock in the
on
Flexible Master Clock Unit
page 227
or
Flexible Master Clock Unit
Chapter 10.2
GCM1...GCM8
59
on
page
Functional Description E1/T1/J1
348. A calculation tool is available
Chapter 13.3
E1 Clocks
DS1.1, 2003-10-23
PEF 2256 H/E
Clocks
T1/J1
on
F56V2_clocking_1
page
FALC
501).
®
56