VSC8221 datasheet(70/138 Pages) MICROSEMI

70 / 138 page

VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

70 of 106

106

1.8 – Extended Status Enable

The VSC8221 is extended status capable, so this bit is hard-wired to “1”.

1.7 – Reserved

1.6 – Preamble Suppression Capability

The VSC8221 accepts management frames on the SMi without preambles, so preamble suppression capability is hard-wired to

“1”. The management frame preamble may be as short as 1 bit.

1.5 – Auto-Negotiation Complete

When this bit is a “1”, the contents of Registers 4, 5, 6, 10 and 28 are valid.

1.4 – Remote Fault

Bit 1.4 will be set to “1” if the Link Partner signals a far-end fault. The bit is cleared automatically upon a read if the far-end fault

condition has been removed.

1.3 – Auto-Negotiation Capability

The VSC8221 is auto-negotiation capable, so this bit is hard-wired to “1”. Note that this bit will read a “1” even if auto-negotiation

is disabled via bit 0.12.

1.2 – Link Status

This bit will return a “1” when the VSC8221 link state machine has reached the “link pass” state, meaning that a valid link has

been established. if the link is subsequently lost, the Link Status will revert to a “0” state. it will remain a “0” until Link Status is

read while the link state machine is in the “link pass” state.

1.1 – Jabber Detect

Note that Jabber Detect is required for 10BASE-T mode only. Jabber Detect will be set to “1” when the jabber condition is

detected. Jabber Detect will be cleared automatically when this register is read.

1.0 – Extended Capability

The VSC8221 has extended register capability, so this bit is hard-wired to “1”.

23.2.3 Register 2 (02h) – PHY identifier Register #1

2.15:0 – PHY identifier Register #1

Microsemi has been assigned an OUi from the iEEE of 0003F1h. Per iEEE requirements, only OUi bits 3 to 18 are used in this

Bit

Name

Access

States

Reset Value

Sticky

15:0

Organizationally Unique identifier RO

OUi most significant bits

(Microsemi OUi bits 3:18)

0000000000001111

(000Fh)

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