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

5.2.2. Logical Device Control Registers

Index

Name

30H Activate

31H I/O Range Check

Type

R/W

R/W

Definition

For each logical device there is one Activate register that controls whether

or not the logical device is active on the ISA bus. Bit[0], if set, activates

the logical device. Before a logical device is activated, I/O range check

must be disabled.

This register is used to perform a conflict check on the I/O port range

programmed for use by a logical device.

Bit[1] - This bt, when set, enables I/O range check.

I/O range check is only valid when the logical device is inactive.

Bit[0] - If set, this bit forces the logical device to respond to I/O reads of

the logical device's assigned I/O range with a 55H when I/O range check

is in operation. If clear, the logical device drives AAH.

5.2.3. Logical Device Configuration Registers

Memory Configuration Registers

Index

40H

41H

42H

Name

BROM base address

bits[23:16]

BROM base address

bits[15:0]

Memory Control

Type

R/W

R/W

R

Definition

Bits[23:20] & bit[17] are read only with values=0.

All other bits are read/write bits.

Bits[13:8] are read only with values=0.

All other bits are read/write bits.

00H. (Only 8-bit operation is supported for BROM)

Note: The BROM size of RTL8019AS is determined by the 9346 contents but not the memory

configuration registers.

I/O Configuration Registers

Index

Name

60H I/O base address bits[15:8]

61H I/O base address bits[7:0]

Type

R/W

R/W

Definition

Bits[15:10] are read only with values=0.

All other bits are read/write bits.

Bits[4:0] are read only with values=0.

All other bits are read/write bits.

Interrupt Configuration Registers

Index

70H

Name

IRQ level

Type

R/W

Definition

Read/write value indicating a selected interrupt level.

Bits[3:0] select which ISA interrupt level is used. One selects IRQ1, fifteen

selects IRQ15. IRQ0 is not a valid interrupt selection and represents no interrupt

selection.

8019AS.doc

25

2001-04-02

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