48

Am79C875

REVISION SUMMARY

Revision C to D

1. Register 18, added bits 8 and 9 for user checking.

2. Register 19, added bit 6, Transformer ratio selection via software.

3. Register 20, added bits 7:4, Cable length indicators.

4. Register 24, added bit 5, RX_ER counter disable.

6. MII Management signals: MDC period changed to 40ns (min), MDC pulse high/low changed to 16ns (min)

7. MII Management signals: MDIO delay changed to 20ns (max), MDIO setup time changed to 4ns (min), MDIO

hold time changed to 3ns (max)

Revision D to E

1. Specified using resistors in the range of 1 K

Ω to 4.7 KΩ for setting the PHYAD pins. Figure 8 reflects the correct

resistors.

2. Added bit 10, Flow Control Support, to Register 5.

Revision E to F

1. Added industrial temperature support and new OPN(KI).

2. Minor edits.

Revision F to G

1. Removed CIM_DIS references.

2. Added pull-up resistor requirements for LEDACT_LINK[0] and LEDDPX[2]/DPLX.

3. Changed pull-up resistor values for LEDs to 1–4.7 K

Ω.

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

5. Minor edits.

Revision G to H

1. Final version

2. Corrected pull-up resistor value for LEDACT_LINK[2] to 1k–4.7K

Ω.

3. Updated package drawing - some tolerances modified.

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