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MTD800

Integrated Fast Ethernet Controller

Myson Century Inc 

MYSON

TECHNOLOGY

MTD 800

(Preliminary)

type field ( .i.e. 88-08 ), the MAC detects to receive the flow control packet and then pauses the transmission

process after the completion of the current transmitted packet. The MAC continues to transmit packets after

the pause-time has expired. On the other hand, the MAC can automatically send out a flow control packet

once the fullness of receiving FIFO has reached a predefined threshold to prevent the FIFO from overflowing

and rendering packet loss.

3.5 EEPROM and BootROM Interface

The MTD800 uses EEPROM to store configuration data, Ethernet and Wake-up-Lan address etc. For Card-

Bus application, the CIS can also be saved in the EEPROM. The BootROM contains the codes for executing

a system boot function. Since EEPROM and BootROM share some I/O pins, these two devices can not be

ena

bled at the same time.

3.5.1 EEPROM Contents

For desktop PCI application, the MTD800 only use 12 words to store configuration and address information.

Therefore, an EEPROM with the size of 64 x 16 bits ( i.e., 93C46 ) is enough to convey the data for such an

application. However, in the system of CardBus, it needs more space to save CIS data and usually a large

size of EEPROM ( e.g. 93C66 ) is required. The memory map of EEPROM and the bit field description for

configuration words are shown in the following tables.

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MTD800 Revision 0.0 07/20/1999

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