SMC91C95 데이터 시트보기 (PDF) - SMSC -> Microchip

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SMC91C95

ISA/PCMCIA Full Duplex Single-Chip Ethernet and Modem Controller with RAM

SMSC -> Microchip 

PIN NO.

NAME

81

nByte High

Enable

nCard

Enable 2

83

Ready

nWait

59, 60,

61, 63,

65, 66,

68-70,

72-74,

76-79

98

Data Bus

Reset

82

Address

Latch

nWrite

Enable

90

Interrupt

DESCRIPTION OF PIN FUNCTIONS

SYMBOL

TYPE

DESCRIPTION

nSBHE

I with pullup

ISA - Byte High Enable input. Asserted (low)

by the system to indicate a data transfer on

the upper data byte.

nCE2

PCMCIA - Card Enable 2 input. Used to

select card on odd byte accesses.

IOCHRDY

OD24 with ISA - Output. Optionally used by the

pullup

SMC91C95 to extend host cycles.

nWAIT

PCMCIA - Output. Optionally used by the

SMC91C95 to extend host cycles.

D0-D15

I/O24

Bidirectional. 16 bit data bus used to access

the SMC91C95 internal registers. The data

bus has weak internal pullups. Supports direct

connection to the system bus without external

buffering.

RESET

BALE

nWE

INTR0

IS with

pullup

IS with

pullup

O24

Input. Active high Reset. This input is not

considered active unless it is active for at least

100ns to filter narrow glitches. A POR circuit

generates an internal reset upon power up for

at least 15msec. All hardware reset

references in this spec relate to the OR

function of the POR and the RESET pin.

ISA - Input. Address strobe. For systems that

require address latching, the falling edge of

BALE latches address lines and nSBHE.

PCMCIA - Write Enable input. Used for

writing into COR and CSR registers as well as

attribute memory space.

ISA - 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.

10

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