XRT8001IP datasheet(31/48 Pages) EXAR

31 / 48 page

XRT8001

Rev. 1.01

6.9 Configuring the XRT8001 WAN Clock into the

“Forward/Slave” Mode.

The user can configure the XRT8001 WAN Clock to

operate in the “Forward/Slave Mode” by executing the

following steps:

Step 1 – Configure the XRT8001 to operate in the

“SLAVE” Mode by pulling the MSB input pin (pin 8) to

GND.

Step 2 – Refer to Table 2B and write the value that

corresponds to the desired "Forward/Slave" Mode into

Bits D[4:1] within Command Register CR0.

Step 3 – Define the values for L, for the CLK1 output

by writing the appropriate value into the CR2 register.

This is achieved by writing the value “L – 1” into this

Notes:

For example, if the user writes “00000” into this regis-

ter, then the XRT8001 device will output a 64kHz

signal via the CLK1 output pin.

If the user intends to output data via CLK1, then he/she

must ensure that the PL1EN bit-field within Command

Figure 18. Illustration of the XRT8001 WAN Clock operating in the

“Forward/Slave" Mode

Step 4- Define the value for L, for the CLK2 output

by writing the appropriate value into the CR3 regis-

ter. This is achieved by writing the value “L – 1”

into this register.

Note: If the user intends to output data via CLK2, then he/

she must ensure that the PL2EN bit-field within Command

Step 5 – Set the CLK1EN and CLK2EN bit-fields,

within Command Register CR4 to 1 in order to

enable the output drivers for CLK1 and CLK2, as

illustrated below.

XRT8001

WAN Clock

FIN

CLK1

CLK2

8kHz

L x 56kHz

L x 64kHz

1 < L < 32

L x 56kHz

L x 64kHz

1 < L < 32

Command Register CR4

SYNCEN

CLK1EN

CLK2EN

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