Datasheet

54 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 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
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 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT 7 BIT 0
Fast comparison DAC threshold adjust for low LOS2. See HLOS2 (Table 02h, Register BAh) for the functional
description.