VSC8221 datasheet(71/138 Pages) MICROSEMI

71 / 138 page

VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

71 of 106

106

23.2.4 Register 3 (03h) – PHY identifier Register #2

3.15:10 – OUi

Microsemi has been assigned an OUi from the iEEE of 0003F1h. Per iEEE requirements, only OUi bits 19 to 24 are used in this

3.9:4 - Vendor Model Number

The Model no. of this iC is ‘010101’.

3.3:0 - Vendor Revision Number

The current Revision Number of this iC is ‘0001’.

23.2.5 Register 4 (04h) – Auto-Negotiation Advertisement Register

This register controls the advertised abilities of the local (not remote) PHY. The state of this register is latched when the auto-

negotiation state machine enters the ABiLiTY_DETECT state. Thus, any writes to this register prior to completion of auto-

negotiation as indicated by Mii Register bit 1.5 should be followed by a re-negotiation for the new values to be properly used for

auto-negotiation. Once auto-negotiation has completed, this register value may be read via the SMi to determine the highest

common denominator technology.

4.15 – Auto-Negotiation Additional Next-Page Transmission Request

The VSC8221 supports additional Next-Page transmission through Mii Register bit 4.15. See description of Mii Register bit 18.1

for more details on Next-Page exchanges.

4.14, 4.12 – Reserved

Bit

Name

Access States

Reset Value

Sticky

15:10 Organizationally Unique identifier

OUi least significant bits

(Microsemi OUi bits 19:24)

110001

9:4

Vendor Model Number

Vendor’s model number (iC)

010101 = VSC8221

3:0

Vendor Revision Number

Vendor’s revision number (iC)

0001 = Silicon Revision C

Bit

Name

Access States

Reset Value

Sticky

Next-Page Transmission Request

R/W

1 = Next-Page transmission request

Reserved

Transmit Remote Fault

R/W

1 = Transmit remote fault

Reserved

Advertise Asymmetric Pause

R/W

1 = Advertise Asymmetric Pause capable

CMODE

Advertise Symmetric Pause

R/W

1 = Advertise Symmetric Pause capable

CMODE

Advertise 100BASE-T4 Capability R/W

1 = 100BASE-T4 capable

Advertise 100BASE-TX FDX

R/W

1 = 100BASE-TX FDX capable

CMODE

Advertise 100BASE-TX HDX

R/W

1 = 100BASE-TX HDX capable

CMODE

Advertise 10BASE-T FDX

R/W

1 = 10BASE-T FDX capable

CMODE

Advertise 10BASE-T HDX

R/W

1 = 10BASE-T HDX capable

CMODE

4:0

Advertise Selector Field

R/W

00001

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