DS1864 Maxim Integrated Products, DS1864 Datasheet - Page 24

• Manufacturer Part Number: DS1864
• Description: SFP Laser Controller and Diagnostic IC
• Manufacturer: Maxim Integrated Products

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SFP Laser Controller and
Diagnostic IC
The
DS1859 configuration), register 80h, bit 2. By default
(SEE bit = 0) these locations act as ordinary EEPROM.
By setting SEE = 1, these locations function as SRAM
memory allowing an infinite number of write cycles. This
also eliminates the requirement for the EEPROM write
time. Because changes made with SEE = 1 do not
effect the EEPROM, these changes will not be retained
through power cycles. The power-up value will be the
last value written with SEE = 0.
24
Figure 16. DS1852/DS1856-Compatible Configuration (Mode Bit = 0, Default)
00h
SEE control bit resides in Table 04h (Table 01h in
____________________________________________________________________
I
GBIC EEPROM
2
C ADDRESS A0h
(256 BYTES)
FFh
EEPROM Write Disable
I
2
00h
80h
F8h
PASSWORD ENTRY (PWE)
C ADDRESS A2h (DEFAULT)
TABLE SELECT BYTE
LOWER MEMORY
TABLE 01h
(120 BYTES)
(4 BYTES)
(8 BYTES)
EEPROM
EEPROM
7Fh
F7h
FFh
80h
LOOKUP TABLE
TABLE 02h
(72 BYTES)
DAC0
NOTE 1:
WHEN MODE BIT (TABLE 04h BYTE 89h BIT 3) = 0,
THE DS1864 IS IN DS1852/DS1856-COMPATIBLE CONFIGURATION (DEFAULT).
NOTE 2:
IF ADFIX = 0, THEN THE MAIN DEVICE I
F ADFIX = 1, THEN THE MAIN DEVICE I
DETERMINED BY THE VALUE IN 8Ch TABLE 04h (IN DS1852 CONFIGURATION).
NOTE 3:
TABLE 00h DOES NOT EXIST IN DS1852/DS1856 CONFIGURATION.
C7h
80h
LOOKUP TABLE
TABLE 03h
(72 BYTES)
DAC1
2
2
C SLAVE ADDRESS IS
C SLAVE ADDRESS IS A2h.
C7h
80h
AND CONFIGURATION
TABLE CONTROL
NON LOOKUP
TABLE 04h
REGISTERS
DFh
C0h
AND CONFIGURATION
TABLE 05h
CONTROL
FBh