VSC8504-02 datasheet(128/131 Pages) MICROSEMI

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Design Considerations

VMDS-10507 VSC8504-02 Datasheet Revision 4.2

117

This register cannot be read when the page access register is set to a value other than 0.

The workaround is to set extended page access register to 0 before accessing clause 45, register 3.22.

8.8

Clause 45 register 3.1

Clause 45, register 3.1, Rx and Tx LPI received bits are cleared upon read only when the extended page

access register (register 31) is set to 0.

This has a minor implication for software that needs to ensure that the extended page access register is

set to 0 before reading clause 45, register 3.1.

The workaround is to set extended page access register to 0 before accessing clause 45, register 3.1.

8.9

Clause 45 register address post-increment

Clause 45 register address post-increment only works when reading registers and only when extended

page access register (register 31) is set to 0.

The workaround is to access the registers individually.

8.10

Fast link failure indication

The fast link failure indication for all the ports is enabled using port 0, register 19E.4.

The workaround is to set register 19E.4 = 1 in PHY 0 to enable Fast Link Fail indication.

8.11

Near-end loopback with AMS enabled

Near-end loopback does not work when AMS is enabled. Near-end loopback is controlled by setting bit

14 of register 0.

The workaround is to disable AMS when enabling loopback. This is a debug feature and does not have

any real life implications.

8.12

Carrier detect assertion

Carrier detect assertion is set to false incorrectly when 9 out of 10 bits in the K28.1 word are in error.

No real life implication is expected, because the event that can trigger this error is extremely unlikely. If it

does occur, the link may drop momentarily and come back up.

8.13

Link status not correct in register 24E3.2 for 100BASE-

FX operation

The link status in register 24E3.2 only reflects the status of 1000BASE-X links. It does not reflect the

status of 100BASE-FX links.

The workaround is to check register 28.4:3 for media operating mode (10 for fiber), 28.4:3 for speed

status (100 for 100 Mbps), and then check 16.12 for current link status.

8.14

in 100BASE-FX mode

copper and 1000BASE-X media modes.

The workaround is to use register 0.12 for autonegotiation status in 100BASE-FX mode when AMS is

disabled. For more information about limitations when AMS is enabled, see AMS and 100BASE-FX,

page 116.

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