T7633 datasheet(11/250 Pages) AGERE

Part #	T7633

Description	Dual T1/E1 3.3 V Short-Haul Terminator

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Device Advisory

August 1999

T7633 Device Advisory Describing Differences

Between Version 1.0 and Version 2.0 of Device

Introduction

This advisory applies only to the T7633 Dual T1/E1 3.3 V Short-Haul Terminator, and it describes the differ-

ences between the two versions of the device.

Data Sheet Changes

Table 148, Framer FDL Control Command Register (FRM_PR21) on page 189 of the May 1998

T7633 Dual

T1/E1 3.3 V Short-Haul Terminator Advance Data Sheet (DS02-244BBAC).

s

In version 1.0 of the device, bit 0 is reserved and must be cleared (write to 0).

s

In version 2.0 of the device, bit 0 = 1 disables the receive frame sync (RFS) output when the receive framer

is in a loss of frame alignment (LFA) state; when bit 0 = 0, the device operates the same as version 1.0 of the

device.

Device Operation Updates

LIU Full Local Loopback (FLLOOP)

In version 1.0 of the device, when FLLOOP is enabled, the device occasionally drops 1s from the data pattern.

This behavior is 1s density dependent, therefore, some data sequences are more sensitive than others.

In version 2.0 of the device, the sensitivity to 1s density no longer occurs.

Microprocessor Interface Timing

In version 1.0 of the device, the LIU alarm status register (LIU_REG0) is clear-on-read (COR) and requires a

modification to the microprocesser interface timing to guarantee proper operation. The timing requirements are

described in the December 1998

T7633 Device Advisory for Version 1.0 of the Device (AY99-007T1E1).

In version 2.0 of the device, the timing modification is no longer required.

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