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Am79C874

P R E L I M INARY

REVISION SUMMARY

Revisions to other versions this document are as follows:

Revision C to D

1. Corrected reversal of Figure 4 and Figure 5 in LED section.

2. Changed ECL to PECL.

Revision D to E

1. Added GPSI timing and diagrams

2. Added Industrial Temperature support

Revision E to F

1. Minor edits

Revision F to G

1. Minor edits

Revision G to H

1. PHYAD pins: Specified using resistors in the range of 1 k

W to 4.7 kW for setting PHYAD pins. In GPSI mode,

PHYAD pins must be set to addresses other than 00h.

ceive LED component changes.

Revision H to I

1. Added clarification to RX_CLK throughout document, which is active only while LINK is established. See pin de-

scription for more information.

2. Added Flow Control descriptions to registers 4 and 5

3. Register 21, bit 9 was reversed: 1 selects the standard LED configuration, while 0 selects the advanced LED

configuration

4. Register 21, bit 2 was changed to indicate EN_SCRM, Scrambler Enable; a 1 enables the scrambler. This reg-

ister is set by the SCRAM_EN pin

5. Maximum input voltage is 5.5 V; operating voltage for 5-V tolerant pins is 5.0 V

6. Minor edits

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