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78Q8430

10/100 Ethernet MAC and PHY

Teridian Semiconductor Corporation 

78Q8430 Data Sheet

DS_8430_001

1.4 Application Environments

This section provides an overview of the application environments such as the STMicroelectronics and

Embest ARM9™ processors, for which the 78Q8430 provides a seamless interface. Figure 6 shows a

simple application diagram for a design using the GBI based 10/100-Mbps Ethernet Controller. By

providing a direct connection to the GBI bus, applications requiring Ethernet network access can be

realized with a high degree of integration. The figure shows the processor and the Ethernet controller

with connected address and data buses. This connection can be either on the motherboard, or via an

expansion module. The GBI Controller controls the address and data and the system control signals.

GBI

8/16/32-bit Bus

78Q8430

10/100 Mbps

Ethernet

Controller

and PHY

EEPROM

or ROM

1:1 Transformer

And RJ45

Connector

Figure 6: GBI Bus Block Diagram

Figure 6 shows the components that are likely to be used with the 10/100-Mbps Ethernet Controller. The

integrated PHY is designed to directly connect to an integrated 1:1 transformer and RJ-45 connector,

thereby providing a minimum parts solution.

1.5 Supply Voltages

The 78Q8430 requires a single 3.3 V (+/-5%) supply voltage. No external components are required to

generate on-chip bias voltages and currents. High accuracy is maintained through a closed-loop trimmed

biasing network. On-chip power converters generate 1.8 V power for core digital logic and memory

blocks. The voltage regulator is not affected by the power-down mode.

1.6 Power Management

The 78Q8430 supports both normal and power-saving modes. When the GBI bus is active, it can be in

normal mode or Power Management low-power modes.

10

Rev. 1.2

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