RTL8019AS Ver la hoja de datos (PDF) - Realtek Semiconductor

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RTL8019AS

Realtek Full-Duplex Ethernet Controller with Plug and Play Function (RealPNP)

Realtek Semiconductor 

SPECIFICATION

RTL8019AS

4. PIN DESCRIPTIONS

4.1. Power Pins

No.

Name

6, 17, 47, 57, 70,

89

VDD

14, 28, 44, 52,

83, 86

GND

4.2. ISA Bus Interface Pins

No.

Name

34

AEN

97-100, 1-4

INT7-0

35

IOCHRDY

96

IOCS16B

[SLOT16]

29

30

33

27-18, 16-

15, 13-7, 5

IORB

IOWB

RSTDRV

SA19-0

87-88, 90-

95, 43-36

31

SD15-0

SMEMRB

Type

P

+5V DC power

P

Ground

Description

Type

I

O

O

O

I

I

I

I

I/O

Descriptions

Address Enable. This ISA signal must be low for a valid I/O

command.

Interrupt request lines which are mapped to IRQ15, IRQ12,

IRQ11, IRQ10, IRQ5, IRQ4, IRQ3, IRQ2/9 respectively. Only

one line is selected to reflect the interrupt requests at one time.

All other lines are tri-stated. The RTL8019AS also uses these

pins as inputs to monitor the actual state of the corresponding

interrupt lines on ISA bus. The result is recorded in the INTR

register, which may be used by software to detect interrupt

conflict.

This ISA signal is driven low to insert wait cycles to current

host read/write command.

Upon power-on reset, this pin acts as an input named SLOT16

to detect whether a 16-bit or 8-bit slot is in use. To do this, it is

connected to a pull-down resistor (about 27KW) externally. At

the falling edge of RSTDRV, the RTL8019AS senses this pin's

state. If it is sensed high, the adapter is thought to be placed on

a 16-bit slot where this pin is connected to the host's IOCS16B

pin, which is typically pulled up by a 300W resistor on the

mother board. If it is sensed low, the adapter is thought to be

placed on an 8-bit slot where this pin is merely pulled low by

the 27KW resistor. After having latched the input state, this

pin is switched as the IOCS16B signal which is an open-drain

output and is driven low during a 16-bit host data transfer. It is

decoded from AEN and SA9-0.

Host I/O read command.

Host I/O write command.

High active hardware reset signal from the ISA bus. Pulses

with high level less than 800ns are ignored.

Host address bus. SA10 is added to implement the fully

decode of PnP ports, address 279h and A79h. In RTL8019,

SA10 is not decoded. In RTL8019AS, SA10 should be 0 for a

valid access to PnP ports.

Host data bus.

I

Host memory read command.

8019AS.doc

6

2001-04-02

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