DM9008 查看數據表（PDF） - Davicom Semiconductor, Inc.

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DM9008

ISA/Plug & Play Super Ethernet Contoller

Davicom Semiconductor, Inc. 

6

8

10

34

94 - 92

91

IRQ3

IRQ4

IRQ5

IRQ9

IRQ10-12

IRQ15

MEMORY INTERFACE PINS

79

EECS

80

64 - 71

BPCS

MD0 - MD7

(64)

(EEDI)

(65)

(EEDO)

(66)

(EECK)

(66)

(LEDSW)

(69)

(BNCSW)

(70)

(SLOT)

63 - 56

PA0 - PA7

NETWORK INTERFACE PINS

37

TX-

38

TX+

54

BNCEN

78

X1

77

X2

DM9008

ISA/Plug & Play Super Ethernet Contoller

O, Z

INTERRUPT REQUESTS: These are 8 interrupt request pins. Only

one pin, which is decoded from Configuration Register A, can be

activated; the other pins are left floating. The activated pin will go

high when an interrupt request is generated from the ENC module of

the DM9008

O

O

I/O, Z

O

EEPROM CHIP SELECT: This signal goes high when the EEPROM

is selected by the DM9008

BOOT ROM CHIP SELECT: This signal goes low when the PC

reads the boot ROM data

MEMORY DATA BUS: These are the memory data signals for the

boot ROM

When the EEPROM is loaded or written, MD0, 1, 2 are used as the

EEPROM signals

* EEPROM DATA IN: This pin is used as the serial input data

signal from the EEPROM

* EEPROM DATA OUT: This pin is used as the serial output data

signal to the EEPROM

* EEPROM CLOCK: This pin is used as the EEPROM clock signal

These memory data pins can also be used as switches when the

DM9008 is in reset state. There is an approximately 100K pull-low

resistor on each pin, and a 10K pull-high resistor can be connected

to a pin when it is switched to logic high

LED mode switch: see page 67 for details.

* When this pin pulled high upon reset, pin 54 outputs 312.5KHz

* SLOT SELECTION: When this pin is pulled to high, the DM9008 is

in NE2000 16-bit mode

BOOT ROM PAGE ADDRESS. When the boot ROM is accessed,

PA0-PA7 are used as the page address of the boot ROM

O

TRANSMIT OUTPUT: Differential line driver which sends the

encoded data to the transceiver. The outputs are source followers

which require 270 ohm pull-down resistors

O

BNC OUTPUT ENABLE: This pin goes high if the value of the

Configuration Register B bit 1 is low and bit 0 is high. Typically, this

pin is used to control the DC-DC converter to enable or disable the

UM9092A (Coaxial Transceiver Interface)

* Output 312.5KHz clock: when the 69 pin (BNCSW) is pulled high,

this pin output 312.5KHz clock

O

CRYSTAL FEEDBACK OUTPUT: Used in crystal connection only.

Connect to ground when using an external clock

I

CRYSTAL or EXTERNAL CLOCK INPUT

6

Final

Version: DM9008-DS-F02

November 30, 2000

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