DS_8430_001
78Q8430 Data Sheet
3.2.2 Media Dependent Interface (MDI) Pins
Table 3: MDI Pin Descriptions
Signal
Pin Number Type Description
TXP
97
98
A
A
Transmit Output Positive/Negative
Transmitter outputs for both 10BASE-T and 100BASE-TX.
MDI-X Mode: Receive Input Positive/Negative
TXN
Receiver inputs for both 10BASE-T and 100BASE-TX.
RXP
RXN
94
93
A
A
Receive Input Positive/Negative
Receiver inputs for both 10BASE-T and 100BASE-TX.
MDI-X Mode: Transmit Output Positive/Negative
Transmitter outputs for both 10BASE-T and 100BASE- TX.
3.2.3 LED Display (PHY) Pins
The LED pins use standard logic drivers. They output a logic low when the LED is meant to be on and
are tri-state when it is meant to be off. The LED cathode should be connected to the output pin and a
series resistor from the power supply connected to the LED anode.
Table 4: LED Pin Descriptions
Signal
Pin Number Type Description
LED0
90
OZ
PHY display LED0 (Link OK)
The default for LED0 is Link OK (LED is on for link established).
LED1
92
OZ
PHY display LED1 (Activity)
The default for LED1 is Link Activity (LED blinks for Rx or Tx data
transferred).
3.2.4 EEPROM Pins
Table 5: EEPROM Interface Pin Descriptions
Signal
Pin Number Type Description
PROM_CS
75
74
O
O
EEPROM Chip Select
Used to frame transmissions to and from an external
EEPROM.
PROM_CLK
EEPROM Clock
Clock for transmitting to and from an external EEPROM/ROM.
This is compatible with the slowest commercial parts, which
specify a maximum frequency of 1 MHz.
PROM_DI
77
76
I
EEPROM Data In
Data line for transmitting from the external EEPROM to the
controller. Must be high with no EEPROM present.
PROM_DO
OZ
EEPROM Data Out
Transfers data from the controller to an external
EEPROM/ROM.
Rev. 1.2
13
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
