PEB2256HT datasheet(59/490 Pages) INFINEON

부품명	PEB2256HT

상세설명	E1/T1/J1 Framer and Line Interface Component for Long and Short Haul Applications

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제조업체	INFINEON [Infineon Technologies AG]

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FALC56 V1.2

PEB 2256

Functional Description E1/T1/J1

Data Sheet

2002-08-27

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.

Figure 12

Flexible Master Clock Unit

GCM1...GCM6

MCLK

E1 Clocks

T1 / J1

Clocks

F0116

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