MIC2590B Datasheet, PDF (17/24 Pages) Micrel Semiconductor – Dual-Slot PCI Hot Plug Controller

MIC2590B
Common Status Register, (STAT), 8-Bits Read/Write
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
read-only read-only read-only read-only read-write read-write read-write read-only
Reserved Reserved GPIB GPIA INTMSK UV_INT OT_INT Reserved
Bit(s)
D[7]
D[6]
GPIB
GPIA
INTMSK
UV_INT
OT_INT
D[0]
Function
Operation
Reserved
Always read as zero
Reserved
Always read as zero
General Purpose Input, State of GPIB pin
Slot B
General Purpose Input, State of GPIA pin
Slot A
Interrupt Mask
0 = /INT generation is
enabled; 1 = /INT
generation is disabled.
The MIC2590B does not
participate in the SMBus
Alert Response Address
(ARA) Protocol.
Undervoltage
Interrupt
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 one
or both of the ON[A/B] pins
are asserted or the
MAIN[A/B] enable control
bits are set.
Overtemperature
Interrupt
Set whenever a circuit
breaker fault occurs as a
result of an over-
temperature condition
exceeding 160°C shutting
both channels off.
Reserved
Read Undefined
Power-Up Default Value: 0000 0000_b = 00_h
Command Byte (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.
August 2002
17
Micrel
MIC2590B