XRT8001IP datasheet(27/48 Pages) EXAR

27 / 48 page

XRT8001

Rev. 1.01

Figure 16. Illustration of the XRT8001 WAN Clock

Operating in the “E1 to T1 – Forward/Master” Mode

6.5 Configuring the XRT8001 WAN Clock into the

“E1 to T1 – Forward/Master” Mode

The user can configure the XRT8001 WAN Clock to

operate in the “E1 to T1 – Forward/Master” Mode by

executing the following steps:

Step 1 – Configure the XRT8001 to operate in the

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

to VDD.

Step 2 – Write the binary value “1000” into Command

Command Register CR0 (Address = 0x00)

IOC4

IOC3

IOC2

IOC1

PL1EN

Command Register, CR1 (Address = 0x01)

PL2EN

Value of “Q - 1” (in Binary Format)

XRT8001

WAN Clock

FIN

CLK1

CLK2

Q x 2.048MHz

Where: 1 < Q < 16

1.544MHz

This step configures the XRT8001 WAN Clock to

operate in the “E1 to T1 – Forward/Master” Mode.

Note: If the user wishes to output a clock signal via the

CLK1 output signal, then he/she should also write a “1”

into the “PL1EN” bit-field within Command Register,

CR0.

Step 3 – Next, you need to specify the value for “Q”

*(e.g., as in the “Q x 2.048MHz” clock signal which

will be applied to the “FIN” input pin).

The user accomplishes this writing the binary

expression for “Q - 1” into Command Register, CR1,

as illustrated below.

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