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

32

SMEMWB

I

Host memory write command. This pin is added to decode the

write command of a flash memory.

4.3. Memory Interface Pins (including BROM, EEPROM)

No.

Name

Type

Description

75

BCSB

O

BROM chip select. Active low signal, asserted when

BROM is read. RTL8019AS drives this pin low when

SA19-14 matches the selected BROM memory base

address and either of the 2 conditions below meets:

(1) SMEMRB is low

(2) SMEMWB is low and RTL8019AS's flash memory

write function is enabled.

76

66-69, 71-74

EECS

BA21-14

O

9346 chip select. Active high signal, asserted when 9346

is read/write.

O

BROM address.＊

77-82, 84-85

BD7-0

I/O

BROM data bus.

[79]

[EESK]

O

9346 serial data clock

[78]

[EEDI]

O

9346 serial data input

[77]

[EEDO]

I

9346 serial data output

[66]

[PNP]

[72-71, 69-67]

[85-84, 82-81]

[77, 74]

[80-78]

65

[BS4-0]

[IOS3-0]

[PL1-0]

[IRQS2-0]

JP

The following pins are defined for jumper options. Their

states are latched at the falling edge of RSTDRV, then

they are changed to serve as the SRAM bus. Each of them

is internally pulled down by a 100KW resistor. Therefore,

the input will be low when left open and high when

pulled up by a 10K resistor externally.

I

When it is high in jumperless mode (i.e. JP=low), the

RTL8019AS is forced into Plug and Play mode

regardless of the contents of 9346.

The following pins are don't care in jumperless mode

(JP=low).

I

Select BROM size and base address.

I

Select I/O base address.

I

Select network medium type.

I

Select one interrupt line among INT7-0.

I

When high, this pin selects jumper mode. When low, it

selects jumperless modes (including RT jumperless and

Plug and Play).

＊ After RTL8019AS latches all jumper status upon power on reset, these pins always* reflect the value of BPAGE register

directly in BROM page mode. In normal mode, BA16-21 are not used and BA14-15 act as:

BROM Size

BA14

BA15

16K

high

high

32K

SA14

high

64K

SA14

SA15

*Note: RTL8019AS doesn't drive BA14-21 until the SMEMRB goes from high to low.

8019AS.doc

7

2001-04-02

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