XRT8001(1999) データシートの表示（PDF） - Exar Corporation

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XRT8001
(Rev.:1999)

XRT8001 WAN Clock

Exar Corporation 

Preliminary

XRT8001

N x 1.544MHz

or

N x 2.048MHz

FIN

Where 1 < N < 16

CLK1

K x 56kHz

or

K x 64kHz

Where 1 < K < 32

XRT8001

WAN Clock

CLK2

K x 56kHz

or

K x 64kHz

Where 1 < K < 32

Figure 9. Illustration of the XRT8001 WAN Clock Device

Operating in the “Forward/Master” Mode

Configuring the XRT8001 WAN Clock Device into

the “Forward/Master” Mode

The user can configure the XRT8001 WAN Clock

Device to operate in the “Forward/Master” Mode, by

executing the following steps:

Step 1 – Configure the XRT8001 device to operate in

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

VDD.

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

bination of “Input Frequency” and “Output Frequen-

cies” (via PLL1 and PLL2) correlate with the desired

configuration.

Input Frequency

N x 1.544MHz

N x 1.544MHz

N x 1.544MHz

N x 2.048MHz

N x 2.048MHz

N x 2.048MHz

PLL1 Output

Frequency

K x 56kHz

K x 56kHz

K x 64kHz

K x 56kHz

K x 56kHz

K x 64kHz

PLL2 Output

Frequency

K x 56kHz

K x 64kHz

K x 64kHz

K x 56kHz

K x 64kHz

K x 64kHz

Value to Write to D4-D1

in CR0

0000

0001

0010

0100

0101

0110

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

Cases for “Forward/Master” Mode Operation

Rev. P1.00

19

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