XRT59L921 查看數據表（PDF） - Exar Corporation

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XRT59L921

TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT

Exar Corporation 

XRT59L921

TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT

PIN DESCRIPTIONS

REV. 1.2.1

PIN#

SYMBOL

TYPE

DESCRIPTION

A3

A5

B5

C6

E5

A7

U5

W6

Y7

Y5

Y3

Y18

W18

Y16

W15

U16

E16

C17

A16

A17

A19

TxPOS_0

TxPOS_1

TxPOS_2

TxPOS_3

TxPOS_4

TxPOS_5

TxPOS_6

TxPOS_7

TxPOS_8

TxPOS_9

TxPOS_10

TxPOS_11

TxPOS_12

TxPOS_13

TxPOS_14

TxPOS_15

TxPOS_16

TxPOS_17

TxPOS_18

TxPOS_19

TxPOS_20

I Transmitter - Positive Data Input – Channel_n:

The exact signal that should be applied to this input pin depends upon whether the

user intends to operate the Transmit Section (of Channel_n) in the Clock or Clock-

less Mode.

Clock Mode:

The Terminal Equipment should apply bit-wide NRZ pulses on this input whenever

the Terminal Equipment needs to transmit a Positive-Polarity pulse onto the line via

TTIP_n and TRing_n output pins. The XRT59L921 will sample this input pin upon the

falling edge of the TClk_n signal.

Clockless Mode:

The Terminal Equipment should apply RZ pulses to this input pin, anytime the Termi-

nal Equipment needs to transmit a Positive-Polarity pulse onto the line via TTIP_n

and TRing_n output pins.

L5

TCK

I JTAG Test Clock input, Boundary Scan Clock input:

NOTE: This input pin should be pulled "Low" for normal operation. internally pulled

"High" with a 50kΩ resistor.

H4

TDI

I JTAG Test Data input, Boundary Scan Test Data Input:

NOTE: This input pin should be pulled "Low" for normal operation. internally pulled

"High" with a 50kΩ resistor.

L4

TDO

O JTAG Test Data output:

Boundary Scan Test Data Output:

H5

TMS

I JTAG Test Mode Select, Boundary Scan Test Mode Select input pin:

P4

TRST

I JTAG Test Mode Reset, Boundary Scan Mode Reset Input pin:

NOTE: This input pin should be pulled "Low" for normal operation. internally pulled

"High" with a 50kΩ resistor.

H17 FACTORY

T13 TEST PINS

U13

FACTORY TEST PINS:

The customer must tie these pins to ground for normal operation.

E10

AGND

E12

AGND

T10

AGND

T12

AGND

L16

AGND

- Analog Ground - Receivers

8

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