DS1864 Maxim Integrated Products, DS1864 Datasheet - Page 27

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

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A2h Main Device, Lower Memory Register Descriptions
A0h Auxiliary Device Memory Register Descriptions
Auxiliary Registers 00h To FFh: GBIC Memory
FACTORY DEFAULT:
MEMORY TYPE:
These registers are used to store GBIC data as called out by the SFF-8472 specification. This block of EEPROM is accessed
through I
Lower Memory Register 00h to 01h: High Temperature Alarm Limit
FACTORY DEFAULT:
MEMORY TYPE:
Temperature measurements above this threshold will set its corresponding alarm bit (Lower Memory Register 70h, bit 7).
Measurements below this threshold will automatically clear its alarm bit.
Lower Memory Register 02h to 03h: Low Temperature Alarm Limit
FACTORY DEFAULT:
MEMORY TYPE:
Temperature measurements below this threshold will set its corresponding alarm bit (Lower Memory Register 70h, bit 6).
Measurements above this threshold will automatically clear its alarm bit.
Lower Memory Register 04h to 05h: High Temperature Warning Limit
FACTORY DEFAULT:
MEMORY TYPE:
Temperature measurements above this threshold will set its corresponding warning bit (Lower Memory Register 74h, bit 7).
Measurements below this threshold will automatically clear its warning bit.
00h
01h
02h
03h
04h
05h
2
C slave address A0h.
bit7
bit7
bit7
2
2
2
S
S
S
-1
-1
-1
0000h
0000h
0000h
00h
Shadowed Memory (SEE)
EEPROM
2
Shadowed Memory (SEE)
2
Shadowed Memory (SEE)
2
2
2
2
-2
-2
-2
6
6
6
____________________________________________________________________
2
2
2
2
2
2
-3
-3
-3
5
5
5
SFP Laser Controller and
2
2
2
2
2
2
-4
-4
-4
4
4
4
2
2
2
2
2
2
-5
3
-5
-5
3
3
2
2
2
2
2
2
Diagnostic IC
-6
-6
-6
2
2
2
2
2
2
2
2
2
-7
1
-7
-7
1
1
Memory Map
bit0
bit0
bit0
2
2
2
2
2
2
-8
0
-8
-8
0
0
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