XRT86VL32IB datasheet(13/65 Pages) EXAR

13 / 65 page

XRT86VL32

REV. V1.2.0

DUAL T1/E1/J1 FRAMER/LIU COMBO - HARDWARE DESCRIPTION

TxMSYNC0/

TxINCLK0

TxMSYNC2/

TxINCLK2

A10

L17

I/O

Multiframe Sync Pulse (TxMSYNCn) / Transmit Input Clock

(TxINCLKn)

The exact function of these pins depends on the mode of opera-

tion selected, as described below.

DS1/E1 Base Rate Mode (1.544MHz/2.048MHz) - TxMSYNCn

In this mode, these pins are used to indicate the multi-frame

boundary within an outbound DS1/E1 frame.

In DS1 ESF mode, TxMSYNCn repeats every 3ms.

In DS1 SF mode, TxMSYNCn repeats every 1.5ms.

In E1 mode, TxMSYNCn repeats every 2ms.

If TxMSYNCn is configured as an input, TxMSYNCn must pulse

"High" for one period of TxSERCLK during the first bit of an out-

bound DS1/E1 multi-frame. It is imperative that the TxMSYNC

input signal be synchronized with the TxSERCLK input signal.

If TxMSYNCn is configured as an output, the transmit section of

the T1/E1 framer will output and pulse TxMSYNC "High" for one

period of TxSERCLK during the first bit of an outbound DS1/E1

frame.

DS1/E1 High-Speed Backplane Modes* - (TxINCLKn as INPUT

ONLY)

In this mode, TxINCLK0 must be used as the high-speed input

clock pin for the backplane interface to latch in high-speed or mul-

tiplexed data on the TxSERn pin. The frequency of TxINCLK0 is

presented in the table below.

NOTES:

*High-speed backplane modes include (For T1/E1)

2.048MVIP, 4.096MHz, 8.192MHz, 16.384MHz HMVIP,

H.100, Bit-multiplexed

modes, and

(For

only)

12.352MHz Bit-multiplexed mode.

In DS1 high-speed modes, the DS-0 data is mapped into

an E1 frame by ignoring every fourth time slot (don’t

care).

These 8 pins are internally pulled “Low” for each

channel.

TRANSMIT SYSTEM SIDE INTERFACE

SIGNAL NAME

BALL#TYPE

OUTPUT

DRIVE(MA)

DESCRIPTION

OPERATION MODE

FREQUENCY OF

TXINCLK0(MHZ)

2.048MVIP non-multiplexed

2.048

4.096MHz non-multiplexed

4.096

8.192MHz non-multiplexed

8.192

12.352MHz Bit-multiplexed

(DS1 ONLY)

12.352

16.384MHz Bit-multiplexed

16.384

16.384 HMVIP Byte-multiplexed

16.384

16.384 H.100 Byte-multiplexed

16.384

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