ISL6112 INTERSIL [Intersil Corporation], ISL6112 Datasheet - Page 20

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

Status Register Slot A (STATUSA)
8-Bits, Read-Only
FAULTA
MAINA
VAUXA
VAUXAF
D[3]
12VAF
D[1]
3VAF
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 FAULTA pin is not affected
by reading the Status Register or by clearing active status bits.
NOTES:
10. If FORCE_ONA is asserted (low), the FAULTA pin will be unconditionally forced to its open-drain state. Note, though, that the value in the
8. If FAULTA has been set by an overcurrent condition on one or more of the MAIN outputs, the ONA input must go LOW to reset FAULTA. If
9. Neither the FAULTA bits nor the FAULTA pins are active when the ISL6112 power paths are controlled by the System Management Interface.
BIT(s)
read-only
FAULTA has been set by a VAUXA overcurrent event, the AUXENA input must go LOW to reset FAULTA. If an overcurrent has occurred on
both a MAIN output and the VAUX output of slot A, both ONA and AUXENA of the slot must go low to reset FAULTA.
When using SMI power path control, AUXENA and ONA pins for that slot must be tied to GND.
FAULTA register bit is not affected by FORCE_ONA, but will instead continue to read as a high if no faults are present on Slot A, and as a low
if any fault conditions exist, which would disable Slot A if FORCE_ONA was not asserted.
FAULTA
D[7]
FAULT Status - Slot A
MAIN Enable Status - Slot A
VAUX Enable Status - Slot A
Overcurrent Fault: VAUXA supply
Reserved
Overcurrent Fault: +12V supply
Reserved
Overcurrent Fault: 3.3V supply
read-only
MAINA
D[6]
20
h
. Both slots are disabled upon power-up, i.e., all supply outputs are off. In response to an overcurrent fault
read-only
FUNCTION
VAUXA
D[5]
TABLE 6. STATUS REGISTER, SLOT A (STATA)
0000 0000
0000 0100
b
b
read/write
VAUXAF
= 00
= 04
D[4]
ISL6112
h
h
Reserved
read-only
D[3]
1 = Fault pin asserted (FAULTA pin is LOW) 0 = Fault pin
deasserted (FAULTA pin is HIGH) See Notes 8, 9, and 10.
Represents the actual state (on/off) of the two Main Power
outputs for Slot A (+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 A 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
12VAF
D[2]
OPERATION
Reserved
read-only
D[1]
September 28, 2007
read/write
3VAF
D[0]
FN6456.0