DS1878T+T&R Maxim Integrated Products, DS1878T+T&R Datasheet - Page 25

• Manufacturer Part Number: DS1878T+T&R
• Description: IC CTLR SFP W/DGTL LDD RX 28TQFN
• Manufacturer: Maxim Integrated Products
• Type: SFP+ Controllerr

Specifications of DS1878T+T&R

• Input Type: *
• Output Type: *
• Interface: *
• Current - Supply: *
• Mounting Type: Surface Mount
• Package / Case: 28-WFQFN exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The control registers are first written once V
POA. They are also written after every temperature con-
version and on a rising edge of TXD. Any time one of
Note 1: This register is not present in the DS1878. To access this register the user must use manual operation (see the Manual
Operation section for details).
Note 2: Either SETLOSH or SETLOSL is written to the slave register SET_LOS. This is determined by the signal RSEL (see Figure 15).
Note 3: In manual 3-wire mode both chip selects are active for all registers.
0Ah, SET_IMODMAX
0Bh, SET_IBIASMAX
12h, SET_LOSTIMER
SLAVE REGISTER
0Fh, SET_PWCTRL
0Eh, MODECTRL
AND ADDRESS
08h, SET_IBIAS
09h, SET_IMOD
10h, SET_TXDE
11h, SET_TXEQ
17h, Reserved
18h, Reserved
19h, Reserved
00h, RXCTRL1
01h, RXCTRL2
03h, SET_CML
04h, SET_LOS
0Ch, MODINC
06h, TXSTAT1
07h, TXSTAT2
0Dh, BIASINC
02h, RXSTAT
05h, TXCTRL
15h, RXTM1
16h, RXTM2
14h, TXTM
SFP+ Controller with Digital LDD Interface
______________________________________________________________________________________
MODULATION
SETLOSTIMER
SETPWCTRL
MODECTRL
REGISTER
IMODMAX
IBIASMAX
SETLOSH,
RXCTRL1
RXCTRL2
RXCTRL3
SETLOSL
SETTXDE
SETTXEQ
TXCTRL2
TXCTRL3
TXSTAT1
TXSTAT2
MODINC
BIASINC
STATUS
SETCML
DS1878
TXCTRL
RXTM1
RXTM2
TXTM
BIAS
1 Only (Note 3)
1 Only (Note 3)
1 Only (Note 3)
1 Only (Note 3)
1 Only (Note 3)
1 Only (Note 3)
1 Only (Note 3)
1 Only (Note 3)
1 Only (Note 3)
1 Only (Note 3)
1 Only (Note 3)
1 Only (Note 3)
1 Only (Note 3)
1 Only (Note 3)
Slave Register Map and DS1878 Corresponding Location
ACTIVE CHIP
CC
SELECTS
1 and 2
1 and 2
1 and 2
1 and 2
1 and 2
1 and 2
1 and 2
1 and 2
1 and 2
1 and 2
1 and 2
exceeds
Tx Deemphasis Setting Table 02h, F0h
REGISTER FUNCTION
DAC Increment Setting
Tx Pulse Width Setting Table 02h, EFh
MODULATION Current
MODULATION Current
MODULATION Current
BIAS Current Setting
Transmitter Control
Transmitter Control
Transmitter Control
these events occurs, the device reads and updates
TXSTAT1 and TXSTAT2, and writes SET_IBIAS and
SET_IMOD to 0.
BIAS Current Limit
Output CML Level
Transmitter Status
Transmitter Status
BIAS Current DAC
Increment Setting
LOS Assert Level
Receiver Control
Receiver Control
Receiver Control
Receiver Status
General Control
Tx Equalization
Rx Test Mode
Rx Test Mode
Tx Test Mode
Limit Setting
LOS Timer
Settings
Setting
Setting
Setting
Table 02h, E8h
Table 02h, E9h
Lower Memory, 6Eh, Bit 1 comes from
the LOSOUT pin (Note 1)
Table 02h, EAh
Table 02h, EBh is SETLOSH,
Table 02h, F3h is SETLOSL (Note 2)
Table 02h, ECh
Table 02h, FCh
Table 02h, FDh
Table 02h, CBh–CCh
Table 02h, 82h–83h
Table 02h, EDh
Table 02h, EEh
Automatically written after each
temperature conversion.
Automatically performed by APC loop.
Disable APC before using 3-wire
manual mode.
(Note 1)
Table 02h, F1h
Table 02h, F2h
(Note 1)
(Note 1)
(Note 1)
Table 02h, F4h
Table 02h, F5h
Table 02h, F6h
DS1878 LOCATION
25