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SMC91C95 Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers

Part # SMC91C95
Description  ISA/PCMCIA Full Duplex Single-Chip Ethernet and Modem Controller with RAM
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Manufacturer  ETC1 [List of Unclassifed Manufacturers]
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SMC91C95 Datasheet(HTML) 11 Page - List of Unclassifed Manufacturers

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11
DESCRIPTION OF PIN FUNCTIONS
PIN NO.
NAME
SYMBOL
TYPE
DESCRIPTION
nInterrupt
Request
nIREQ
PCMCIA - Active low interrupt request output.
Pin acts as a Ready pin during power-up. The
pin should be pulled low within 10us of the
application of the VCC or Reset (which ever
occurs later). It remains low(0) until the CIS is
loaded in the Internal SRAM.
The high(1)
state indicates to the host controller that the
device is ready.
91
Interrupt 1
INTR1
O24
ISA - Output. Active high interrupt signal. The
interrupt line selection is determined by the
value of INT SEL1-0 bits in the Configuration
Register. This interrupt is tri-stated when not
selected.
nINPACK
PCMCIA - Output asserted to acknowledge
read cycles for an enabled function.
92
Interrupt 2
INTR2
O24
ISA - Output. Active high interrupt signal. The
interrupt line selection is determined by the
value of INT SEL1-0 bits in the Configuration
Register. This interrupt is tri-stated when not
selected.
nStatus
Changed
nSTSCHG
PCMCIA - Status changed bit. Depending on
the setting of the RingEn bit (Modem CCSR),
this pin either reflects the ringing status (ExCA
mode) or the state of the Modem Changed bit.
The ringing status is obtained by stretching
the MRINGIN to convert a 20Hz toggle rate to
a constant level.
93
Interrupt 3
INTR3
O24
ISA - Output. Active high interrupt signal. The
interrupt line selection is determined by the
value of INT SEL1-0 bits in the Configuration
Register. This interrupt is tri-stated when not
selected.
85
nI/O 16
nIOCS16
OD24
ISA - Active low output asserted in 16 bit
mode when AEN is low and A4-A15 decode
to the SMC91C95 address programmed into
the high byte of the Base Address Register.


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