XRT94L33IB datasheet(29/110 Pages) EXAR

29 / 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

TXPOHFRAME

TTL

Transmit Path Overhead Input Port – Frame Output pin:

This pin is used for the Transmit AU-4/VC-4 Mapper POH

Processor Block when TUG-3 mapping is used.

This output pin, along with the “TxPOH”, “TxPOHEnable”,

“TxPOHIns” and “TxPOHClk” function as the “Transmit Path

Overhead Input Port”.

If the user is only inserting POH data via these input pins:

Note:

In this mode, the “TxPOH” port will pulse these output

pins “high” whenever it is ready to accept and

process the J1 byte (e.g., the very first POH byte)

via this port.

TXPOHINS

TTL

Transmit Path Overhead Input Port – Insert Enable Input

pin:

This pin is used for the Transmit AU-4/VC-4 Mapper POH

Processor Block when TUG-3 mapping is used.

These input pins, along with “TxPOH”, “TxPOHEnable”,

“TxPOHFrame” and “TxPOHClk” function as the “Transmit

Path Overhead (TxPOH) Input Port.

These input pins permit the user to enable or disable the

“TxPOH” input port.

If these input pins are pulled “high”, then the “TxPOH” port will

sample and latch data via the corresponding “TxPOH” input

pins, upon the falling edge of “TxPOHClk”.

Note:

Conversely, if these input pins are pulled “low”, then

the “TxPOH” port will NOT sample and latch data via

the corresponding “TxPOH” input pins.

TXPOHENABLE

TTL

Transmit Path Overhead Input Port – POH Indicator

Output pin:

This pin is used for the Transmit AU-4/VC-4 Mapper POH

Processor Block when TUG-3 mapping is used.

These

output

pins,

along

with

“TxPOH”,

“TxPOHIns”,

“TxPOHFrame” and “TxPOHClk” function as the “Transmit

Path Overhead (TxPOH) Input Port”.

These output pins will pulse “high” anytime the “TxPOH” port is

ready to accept and process POH bytes.

These output pins

will be “low” at all other times.

XRT94L33IB Datasheet(PDF) 29 Page - Exar Corporation

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