XRT72L13 datasheet(153/370 Pages) EXAR

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M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

XRT72L13

PRELIMINARY

REV. 1.0.6

141

2.3.2.93 CP-Bit Error One Second Accumulator

This “Read-Only” register, along with the “Frame CP-

Bit Error - One Second Accumulator Register - MSB”

(Address = 0x72) contains a 16-bit representation of

the number of “CP Bit Errors” tjhat have been detect-

ed by the Receive DS3 Framer block, within the last

one-second sampling period. This register contains

the LSB (or Lower Byte) value of this 16-bit expres-

sion.

2.3.2.94 Line Interface Drive Register

Bit 5 - REQB - (Receive Equalization Bypass Con-

trol)

This "Read/Write" bit-field allows the user to control

the state of the REQB output pin of the XRT72L13.

This output pin is intended to be connected to the

REQB input pins of the XRT7300 DS3/E3 LIU IC. If

the user forces this signal to toggle "high", then the

Receive Equalizer (within the XRT7300) will be dis-

abled. Conversely, if the user forces this signal to

toggle "low", then the Receive Equalizer (within the

XRT7300) will be enabled.

Writing a "1" to this bit-field causes the Framer device

to toggle the REQB output pin "high". Writing a "0" to

this bit-field causes the Framer device to toggle the

REQB output pin "low".

For information on the criteria that should be used

when deciding whether to bypass the equalization cir-

cuitry or not, please consult the "XRT7300 DS3/E3/

STS-1 LIU IC" data sheet.

NOTE: If the customer is not using the XRT7300 DS3/E3/

STS-1 LIU IC, then he/she can use this bit-field and the

REQB output pin for other purposes.

Bit 4 - TAOS - (Transmit All Ones Signal)

This "Read/Write" bit-field allows the user to control

the state of the TAOS output pin of the XRT72L13.

This output pin is intended to be connected to the

TAOS input pin of the XRT7300 DS3/E3/STS-1 LIU

IC. If the user forces this signal to toggle "high", then

the XRT7300 LIU device will transmit an "All Ones"

pattern onto the line. Conversely, if the user com-

mands this output signal to toggle "low" then the

XRT7300 LIU IC will proceed to transmit data based

upon the pattern that it receives via the TxPOS and

TxNEG output pins (of the Framer IC).

Writing a "1" to this bit-field will cause the TAOS out-

put pin to toggle "high". Writing a "0" to this bit-field

will cause this output pin to toggle "low".

NOTE: If the customer is not using the XRT7300 DS3/E3/

STS-1 LIU IC, then he/she can use this bit-field, and the

TAOS output pin for other purposes.

Bit 3 - Encodis - (B3ZS Encoder Disable)

This "Read/Write" bit-field allows the user to control

the state of the Encodis output pin of the XRT72L13

M13 device. This output pin is intended to be con-

nected to the Encodis input pin of the XRT7300 DS3/

E3/STS-1 LIU IC. If the user forces this signal to tog-

gle "high", then the "internal B3ZS/HDB3 encoder"

(within the XRT7300) will be disabled. Conversely, if

the user command this output signal to toggle "low",

then the "internal B3ZS/HDB3 encoder" (within the

XRT7300) will be enabled.

Writing a "1" to this bit-field causes the Framer IC to

toggle the "Encodis" output pin "high". Writing a "0"

to this bit-field will cause the Framer IC to toggle this

output pin "low".

NOTES:

1. The B3ZS/HDB3 encoder, within the XRT7300, is

not to be confused with the B3ZS/HDB3 encoding

capable that exists within the Transmit Section of

the Framer IC.

CP-BIT ERRORS - ONE SECOND ACCUMULATOR REGISTER - LSB (ADDRESS = 0X73)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

CP Bit Error Count - Low Byte

0000

000

LINE INTERFACE DRIVE REGISTER (ADDRESS = 0X80)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

REQB

TAOS

ENCODIS

TxLEV

RLOOP

LLOOP

R/W

0001

000

XRT72L13 Datasheet(PDF) 153 Page - Exar Corporation

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