MIC2593_08 Datasheet, PDF (20/26 Pages) Micrel Semiconductor – Dual-Slot PCI Hot Plug Controller

Micrel, Inc.
Common Status Register (CS)
8-Bits, Read/Write
D[7]
read/write
Reserved
D[6]
read/write
Reserved
D[5]
read-only
GPI_B
Common Status Register (CS)
D[4]
D[3]
read-only
read/write
GPI_A
INTMSK
D[2]
read/write
UV_INT
D[1]
read/write
OV_INT
MIC2593
D[0]
read-only
Reserved
Bit(s)
D[7]
D[6]
GPI_B
GPI_A
INTMSK
Function
Reserved
Reserved
General Purpose Input 0, Slot B
General Purpose Input 0, Slot A
Interrupt Mask
UV_INT Undervoltage Interrupt
OV_INT Overtemperature Interrupt
D[0]
Reserved
Operation
Always read as zero
Always read as zero
State of GPIB pin
State of GPIA pin
0 = /INT generation is enabled
1 = /INT generation is disabled
The MIC2593 does not participate in the SMBus Alert
Response Address (ARA) protocol.
0 = No UVLO fault
1 = UVLO fault
Set whenever a circuit breaker fault condition occurs as
a result of an undervoltage lockout condition on one of
the main supply inputs. This bit is only set if a UVLO
condition occurs while the ON[A/B] pin is asserted or
the MAIN[A/B] control bits are set.
0 = Die Temp < 160°C
1 = Fault: Die Temp > 160°C
Set if a fault occurs as a result of theMIC2593’s die
temperature exceeding160°C.
Undefined
Power-Up Default Value:
0000 0000_b = 00_h
Command_Byte Value (R/W): 0000 0110_b = 06_h
To reset the OT_INT and UV_INT fault bits, a logical 1 must be written back to these bits.
September 2008
20
M9999-092208