DS1877 datasheet(54/65 Pages) MAXIM

54 / 65 page

Maxim Integrated

SFP Controller for Dual Rx Interface

DS1877

Table 02h, Register B9h: RESERVED

Table 02h, Register BAh: HLOS2

Table 02h, Register BBh: LLOS2

FACTORY DEFAULT

00h

READ ACCESS

N/A

WRITE ACCESS

N/A

A2h AND B2h MEMORY

N/A

MEMORY TYPE

N/A

This register is reserved.

FACTORY DEFAULT

00h

READ ACCESS

PW2 or (PW1 and RWTBL2) or (PW1 and RTBL2)

WRITE ACCESS

(PW2 and QT2EN = 0) or (PW1 and RWTBL2 and QT2EN = 0)

A2h AND B2h MEMORY

Common A2h and B2h memory locations

MEMORY TYPE

Nonvolatile (SEE)

BAh

BIT 7

BIT 0

Fast comparison DAC threshold adjust for high LOS2. The combination of HLOS2 and LLOS2 creates a hys-

teresis comparator. As RSSI2 falls below the LLOS2 threshold, the LOS2 LO alarm bit is set to 1. The LOS2 LO

alarm remains set until the RSSI2 input is found above the HLOS2 threshold setting, which clears the LOS2 LO

alarm bit and sets the LOS2 HI alarm bit.

FACTORY DEFAULT

00h

READ ACCESS

PW2 or (PW1 and RWTBL2) or (PW1 and RTBL2)

WRITE ACCESS

(PW2 and QT2EN = 0) or (PW1 and RWTBL2 and QT2EN = 0)

A2h AND B2h MEMORY

Common A2h and B2h memory locations

MEMORY TYPE

Nonvolatile (SEE)

BBh

BIT 7

BIT 0

Fast comparison DAC threshold adjust for low LOS2. See HLOS2 (Table 02h, Register BAh) for the functional

description.

DS1877 Datasheet(PDF) 54 Page - Maxim Integrated Products

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