Rainbow Electronics DS1875 - Manual (Page 82)

DS1875
PON Triplexer and SFP Controller
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Table 02h, Register C5h to C6h: RESERVED
FACTORY DEFAULT 00h
READ ACCESS PW2
WRITE ACCESS PW2
MEMORY TYPE Nonvolatile (SEE)
These registers are reserved.
Table 02h, Register C7h: M4 LUT CNTL
FACTORY DEFAULT 00h
READ ACCESS PW2
WRITE ACCESS PW2
MEMORY TYPE Nonvolatile (SEE)
C7h RESERVED RESERVED RESERVED RESERVED FBOL FBCL DBL_SB UP_LOWB
BIT 7 BIT 0
BITS 7:4 RESERVED (Default = 000000b)
BITS 3:2
FBOL and FBCL: Force bias open loop and force bias closed loop.
00b = (Default) normal operation.
10b = Force control of I
BIAS to be open loop regardless of duration of BEN pulses.
01b = Force control of I BIAS to be closed loop regardless of duration of BEN pulses.
11b = Same as 10b.
When forcing open-loop mode, BEN should be ground or at any burst length.
BIT 1
DBL_SB: Chooses the size of LUT for Table 06h.
0 = (Default) Single LUT of 32 bytes.
1 = Double LUT of 16 bytes.
BIT 0
UP_LOWB: Determines which 16-byte LUT is used if DBL_SB = 1. If DBL_SB = 0, the value of
this bit is a don’t care.
0 = (Default) Chooses the lower 16 bytes of Table 06h (80h to 8Fh).
1 = Chooses the upper 16 bytes of Table 06h (90h to 9Fh).
Controls the size and location of LUT functions for the MON4 measurement.