ISL6112 INTERSIL [Intersil Corporation], ISL6112 Datasheet - Page 22

• Manufacturer Part Number: ISL6112
• Description: Dual Slot PCI-Express Power Controller
• Manufacturer: INTERSIL [Intersil Corporation]

Status Register Slot B (STATB)
8-Bits, Read-Only
FAULTB
MAINB
VAUXB
VAUXBF
D[3]
12VBF
D[1]
3VBF
Power-Up Default Value:
Command_Byte Value (R/W):
The power-up default value is 00
condition, writing a logical 1 back into the active (or set) bit position will clear the bit and deassert INT. The status of the FAULTB pin is not
affected by reading the Status Register or by clearing active status bits.
NOTES:
13. If FAULTB has been set by an overcurrent condition on one or more of the MAIN outputs, the ONB input must go LOW to reset FAULTB. If
14. Neither the FAULTB bits nor the FAULTB pins are active when the ISL6112 power paths are controlled by the System Management Interface.
15. If FORCE_ONB is asserted (low), the FAULTB pin will be unconditionally forced to its open-drain state. Note, though, that the value in the
BIT(s)
read-only
FAULTB has been set by a VAUXB overcurrent event, the AUXENB input must go LOW to reset FAULTB. If an overcurrent has occurred on
both a MAIN output and the VAUX output of slot B, both ONB and AUXENB of the slot must go low to reset FAULTB.
When using SMI power path control, the AUXENB and ONB pins for that slot must be tied to GND.
FAULTB register bit is not affected by FORCE_ONB, but will instead continue to read as a high if no faults are present on Slot B, and as a low
if any fault conditions exist which would disable Slot B if FORCE_ONB was not asserted.
FAULTB
D[7]
FAULT Pin Status - Slot B
MAIN Enable Status - Slot B
VAUX Enable Status - Slot B
Overcurrent Fault: VAUXB supply
Reserved
Over current Fault: +12V supply
Reserved
Over current Fault: 3.3V supply
read-only
MAINB
D[6]
22
h
. Both slots are disabled upon power-up, i.e., all supply outputs are off. In response to an overcurrent fault
read-only
VAUXB
D[5]
FUNCTION
TABLE 8. STATUS REGISTER, SLOT B (STATB)
0000 0000
0000 0101
h
b
read/write
VAUXBF
= 00
= 05
D[4]
ISL6112
h
h
Reserved
read-only
D[3]
1 = Fault pin asserted (FAULTB pin is LOW) 0 = Fault pin
deasserted (FAULTB pin is HIGH) See Notes 13, 14,
and 15.
Represents the actual state (on/off) of the four Main
Power outputs for Slot B (+12V and +3.3V)
1 = MAIN Power ON
0 = MAIN Power OFF
Represents the actual state (on/off) of the Auxiliary
Power output for Slot B
1 = AUX Power ON
0 = AUX Power OFF
1 = Fault 0 = No fault
Always read as zero
1 = Fault 0 = No fault
Always read as zero
1 = Fault 0 = No fault
read/write
12VBF
D[2]
OPERATION
Reserved
read-only
D[1]
September 28, 2007
read/write
3VBF
D[0]
FN6456.0