XRT8001IP datasheet(21/48 Pages) EXAR

21 / 48 page

XRT8001

Rev. 1.01

Figure 13. Illustration of the XRT8001 WAN Clock Device

Operating in the “Forward/Master” Mode

5.0 Configuring the XRT8001 WAN Clock into

the “Forward/Master” Mode

The user can configure the XRT8001 WAN Clock to

operate in the “Forward/Master” Mode, by executing

the following steps:

Step 1 – Configure the XRT8001 to operate in the

“MASTER” Mode, by pulling the MSB pin (pin 8) to

VDD.

Step 2 – Review Table 4, and determine which combi-

nation of “Input Frequency” and “Output Frequencies”

(via PLL1 and PLL2) correlate with the desired configu-

ration.

Input Frequency

PLL1 Output

Frequency

PLL2 Output

Frequency

Value to Write to D4-D1

in CR0

N x 1.544MHz

K x 56kHz

0000

N x 1.544MHz

K x 56kHz

K x 64kHz

0001

N x 1.544MHz

K x 64kHz

0010

N x 2.048MHz

K x 56kHz

0100

N x 2.048MHz

K x 56kHz

K x 64kHz

0101

N x 2.048MHz

K x 64kHz

0110

Table 4. Listing of “Input Frequency and “Output Frequency”

Cases for “Forward/Master” Mode Operation

XRT8001

WAN Clock

FIN

CLK1

CLK2

N x 1.544MHz

N x 2.048MHz

Where 1 < N < 16

K x 56kHz

K x 64kHz

Where 1 < K < 32

K x 56kHz

K x 64kHz

Where 1 < K < 32

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