XRT94L33IB datasheet(13/110 Pages) EXAR

13 / 110 page

XRT94L33

Rev 2

22 ...0

00 ...0

33 ---C

C H

H A

N N

N E

E L

L D

D S

S 3

33 ///E

E 3

33 ///S

S T

T S

S -

-- 1

11 T

T O

O S

S T

T S

S -

-- 3

33 ///S

S T

T M

M -

-- 1

11 M

M A

P P

P E

E R

R S

S O

O N

N E

E T

T A

T M

M ///P

P P

P –

–– H

H A

R W

W A

A R

R E

E M

M A

N U

U A

PIN #

SIGNAL NAME

I/O

SIGNAL

TYPE

DESCRIPTION

REFTTL

TTL

19.44MHz or 77.76MHz Clock Synthesizer Reference Clock

Input Pin:

The exact function of this input pin depends upon whether the

user enables the “Clock Synthesizer” block or not.

If Clock Synthesizer is Enabled.

If the “Clock Synthesizer” block is enabled, then it will be used to

generate the 155.52MHz, 19.44MHz and/or 77.76MHz clock

signal for the STS-3/STM-1 block. In this mode, the user should

apply a clock signal of either of the following frequencies to this

input pin.

• 19.44 MHz

• 38.88 MHz

• 51.84 MHz

• 77.76 MHz

Afterwards, the user needs to write the appropriate data into the

“Transmit Line Interface Control Register“ (Address Location =

0x0383) in order to (1) configure the Clock Synthesizer Block to

accept any of the above-mentioned signals and generate a

155.52MHz, 19.44MHz or 77.76MHz clock signal, (2) to

configure the Clock Synthesizer to function as the Clock Source

for the STS-3/STM-1 block.

If Clock Synthesizer is NOT Enabled:

If the “Clock Synthesizer” block is NOT enabled, then it will NOT

be used to generate the 19.44MHz and/or 77.76MHz clock

signal, for the STS-3/STM-1 block. In this configuration seting,

the user MUST apply a 19.44MHz clock signal to this input pin.

AG3

LOSTTL

TTL

Loss of Optical Carrier Input – Primary:

The user is expected to connect the “Loss of Carrier” output

(from the Optical Transceiver) to this input pin.

If this input pin and the LOSPECL_P pin are pulled “high”, or if

both of these input pins are pulled “low”, tthen the Receive STS-

3 TOH Processor block will declare a “Loss of Optical Carrier”

condition.

Note:

This input pin is only active if the “Primary Port” is

active.

This input pin is inactive if the “Redundant

Port” is active.

AG25

LOSTTL_R

TTL

Loss of Optical Carrier Input – Redundant:

The user is expected to connect the “Loss of Carrier” output

(from the Optical Transceiver) to this input pin.

If this input pin and the LOSPECL_R are pulled “high”, or if both

of these input pins are pulled “low”, then the Receive STS-3 TOH

Processor block will declare a “Loss of Optical Carrier” condition.

Note:

This input pin is only active if the “Redundant Port” is

active. This input pin is inactive if the “Primary Port” is

active.

XRT94L33IB Datasheet(PDF) 13 Page - Exar Corporation

XRT94L33IB Datasheet(HTML) 13 Page - Exar Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL