PEB2256HT datasheet(95/490 Pages) INFINEON

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FALC56 V1.2

PEB 2256

Functional Description E1

Data Sheet

2002-08-27

4.4.2

Transmit Line Interface (E1)

The analog transmitter transforms the unipolar bit stream to ternary (alternate bipolar)

return to zero signals of the appropriate programmable shape. The unipolar data is

provided by the digital transmitter.

Figure 23

Transmitter Configuration (E1)

Similar to the receive line interface three different data types are supported:

• Ternary Signal

Single-rail data is converted into a ternary signal which is output on pins XL1 and XL2.

The HDB3 and AMI line code is employed. Selected by FMR0.XC1/0 and

LIM1.DRS = 0.

• Dual-rail data PCM(+), PCM(–) at multifunction ports XDOP/XDON with 50% or 100%

duty cycle and with programmable polarity. Line coding is done in the same way as in

ternary interface mode. Selected by FMR0.XC1/0 and LIM1.DRS = 1.

• Unipolar data on port XOID is transmitted either in NRZ (Non Return to Zero) with

100% duty cycle or in CMI (Code Mark Inversion or known as 1T2B) Code with or

without (FMR3.CMI) preprocessed HDB3 coding to a fiber-optical interface. Clocking

off data is done with the rising edge of the transmit clock XCLK (2048 kHz) and with

a programmable polarity. Selection is done by FMR0.XC1 = 0 and LIM1.DRS = 1.

Table 21

Recommended Transmitter Configuration Values (E1)

Parameter

Characteristic Impedance [

Ω]

120

1 (± 1%) [Ω]7.5

This value refers to an ideal transformer without any parasitics. Any transformer resistance or other parasitic

resistances have to be taken into account when calculating the final value of the output serial resistors.

7.5

t2 : t1

1 : 2.4

ITS10968

Line

t 1

t 2

XL2

XL1

FALC

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