Chapter 1: Hardware Description

The QuadFALC includes a flexible clock unit that uses a clock supplied on its MCLK pin.

The QuadFALC MCLK input is connected to a 12.500 MHz +/-20ppm fixed frequency (CPM BRG6) used by the internal DPLL. As a result, the GCM registers must be programmed with the following values:

Table 1-26. GCM Register Programming (MCLK=12.500 MHz)

Register Value

*&0￿ ￿[￿%

*&0￿ ￿[￿'

*&0￿ ￿[$&

*&0￿ ￿[￿￿

*&0￿ ￿[￿￿

*&0￿ ￿[￿￿

The QuadFALC has an integrated short-haul and long-haul line interface, comprising a receive equalization network, noise filtering, and programmable Line Build-Outs (LBOs). It implements an integrated Channel Service Unit (CSU) in T1 mode. For each type of LBO, the shape of the transmit pulse must be adjusted through its registers LIM0, LIM2, XPM0, XPM1, and XPM2 in order to comply with FCC 68 or ANSI T1.403. Table 1-27provides the values in T1 mode for the 4538 hardware (in E1 mode, default values are suitable)

Table 1-27. Transmit Pulse Shape Programming

 

 

 

2 Front Access

4 Rear Access

 

 

LIM2:LBO21

 

 

 

 

 

 

Line Build-Out

LIM0:EQON

XPM0

XPM1

XPM2

XPM0

XPM1

XPM2

 

 

 

 

 

 

 

 

 

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4538 Hardware Reference Manual

31