XRT8001 datasheet(30/48 Pages) EXAR

30 / 48 page

XRT8001

Rev. 1.01

Value of “M”

Value to be Written into

Command Register CR2

0000X

0001X

001XX

X1XX or 1XXX

Table 7. Relationship Between the Value of

“M” and the Value to Be Written into Command

Output Frequency)

Note: The expression “X” indicates a “Don’t Care” value for

that particular bit-field.

Command Register, CR2 (Address = 0x02)

SEL14

SEL13

SEL12

SEL11

SEL10

Value from Table 7

Step 5 – Specify the value for “M” (e.g., as in the “M x

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

the “CLK2” output pin.

This is accomplished by reviewing Table 8, 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, CR3.

Value of “M”

Value to be Written into

Command Register CR3

0000X

0001X

001XX

X1XXX or 1XXXX

Table 8. Relationship Between the Value of

“M” and the Value to Be Written into Command

Output Frequency)

Note: The expression “X” indicates a “Don’t Care” value

for that particular bit-field.

Command Register, CR3 (Address = 0x03)

SEL24

SEL23

SEL22

SEL21

SEL20

Value from Table 8

Step 6 – Enable any of the following output signals as

appropriate:

“SYNC”, “CLK1”, “CLK2” and

“LOCKDET”.

This is accomplished by writing a “1” into the corre-

sponding bit-fields, within Command Register CR4, as

illustrated below:

Command Register CR4, (Address = 0x04)

SYNCEN

CLK1EN

CLK2EN

LDETDIS2

LDETDIS1

6.8 The "Forward/Slave" Mode

When the XRT8001 WAN Clock has been configured to

operate in the “Forward/Slave” Mode, then it will accept

an 8kHz clock signal via the “Reference Clock” input at

FIN (pin 3). In response to this clock signal, the

XRT8001 WAN Clock will output either a “L x 56kHz” or

“L x 64kHz” clock signal via the “Clock Output pins”

(CLK1 and CLK2); where L can range in value from 1 to

32.

A simple illustration of the XRT8001 WAN Clock

operating in the "Forward/Slave" Mode” is presented in

Figure 18.

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