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SFP Laser Controller and
Diagnostic IC
Table 04h (Table 01h in DS1859 Configuration), DAh: Control And Shutdown Configuration And Status
FACTORY DEFAULT:
MEMORY TYPE:
00h
Shadowed Memory (SEE)
DAh
FPOL
HTXP enable HBAL enable LTXP enable
X
X
X
MASK
bit7
This byte contains bits for shutdown configuration and status control.
FPOL: Configures the polarity of the auxiliary shutdown (FETG output).
bit0
bit7
bit6
bit5
bit4
bit3:1
bit0
0 = FETG is asserted low under a shutdown condition.
1 = FETG is asserted high under a shutdown condition.
HTXP enable: Configures a shutdown in response to a HTXP alarm.
0 = Shutdown will not respond to a trip of HTXP alarm.
1 = Shutdown will respond to a trip of HTXP alarm.
HBAL enable: Configures a shutdown in response to a HBAL alarm.
0 = Shutdown will not respond to a trip of HBAL alarm.
1 = Shutdown will respond to a trip of HBAL alarm.
LTXP enable: Configures a shutdown in response to a LTXP alarm.
0 = Shutdown will not respond to a trip of LTXP alarm.
1 = Shutdown will respond to a trip of LTXP alarm.
Not used.
MASK: Configures locations of alarms and warning interrupt masks to be either in Table 05h or in Table
01h (Table 00h in DS1859 configuration).
0 = Interrupt masks are located in Table 05h, bytes F8h through FBh.
1 = Interrupt masks are located in Table 01h (Table 00h in DS1859 configuration), bytes F8h through FBh.
Table 04h (Table 01h in DS1859 Configuration), DBh: High Transmitted Power Threshold (HTXP)
FACTORY DEFAULT:
MEMORY TYPE:
FFh
Shadowed Memory (SEE)
DBh
2 7
2 6
2 5
2 4
2 3
2 2
2 1
2 0
bit7
bit0
This byte sets a high D/A threshold for comparing transmitted power level. Only the upper 8 bits of the 16 bit value are compared.
Table 04h (Table 01h in DS1859 Configuration), DCh: Low Transmitted Power Threshold (LTXP)
FACTORY DEFAULT:
MEMORY TYPE:
00h
Shadowed Memory (SEE)
DCh
2 7
2 6
2 5
2 4
2 3
2 2
2 1
2 0
bit7
bit0
This byte sets a low D/A threshold for comparing transmitted power level. Only the upper 8 bits of the 16 bit value are compared.
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