XRT8001IP datasheet(29/48 Pages) EXAR

29 / 48 page

XRT8001

Rev. 1.01

Figure 17. Illustration of the XRT8001 WAN Clock

Operating in the “High Speed – Reverse” Mode

6.7 Configuring the XRT8001 WAN Clock into the

“High Speed – Reverse” Mode.

The user can configure the XRT8001 WAN Clock to

operate in the “High Speed – Reverse” 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 - Write the value "1101" into bts D4-D1 within

command register CR0

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.

This step configures the XRT8001 to operate in the

“High Speed – Reverse” Mode.

Step 3 – Write the binary expression “0000” into bit-

fields “D4 through D1” within Command Register, CR1,

as illustrated below.

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

CLK2 output signal, then he/she should also write a “1” into

the “PL2EN” bit-field within Command Register CR1.

Step 4 – Specify the value for “M” (e.g., as in the “M x

2.048MHz” clock signal) which is to be output via the

“CLK1” output pin.

This is accomplished by reviewing Table 7, and deter-

mining the 5 bit binary value which corresponds with

the desired value of “M”. Afterwards, the user should

write this value into Command Register CR2.

Command Register, CR1 (Address = 0x01)

PL2EN

Command Register CR0 (Address = 0x00)

IOC4

IOC3

IOC2

IOC1

PL1EN

XRT8001

WAN Clock

FIN

CLK1

CLK2

64kHz

M x 2.048MHz

M = 1, 2, 4 or 8

M x 2.048MHz

M = 1, 2, 4 or 8

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