VSC8221XHH datasheet(78/138 Pages) MICROSEMI

78 / 138 page

VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

78 of 106

106

9.9 – 1000BASE-T FDX1

Since the VSC8221 is 1000BASE-T FDX capable, this bit is “1” by default. if bit 9.9 is written to be “0”, the auto-negotiation state

machine for the local PHY will be blocked from advertising 1000BASE-T FDX. Note that the Link Partner will be notified of the

state of bit 9.9 during auto-negotiation. After auto-negotiation is complete, changing the state of this bit has no effect unless

auto-negotiation is manually restarted.

9.8 – 1000BASE-T HDX1

Since the VSC8221 is 1000BASE-T HDX capable, this bit is “1” by default. if bit 9.8 is written to be “0”, the auto-negotiation state

machine for the local PHY will be blocked from advertising 1000BASE-T HDX. Note that the Link Partner will be notified of the

state of bit 9.8 during auto-negotiation. After auto-negotiation is complete, changing the state of this bit has no effect unless

auto-negotiation is manually restarted.

9.7:0 – Reserved

23.2.11 Register 10 (0Ah) – 1000BASE-T Status Register #1

10.15 – MASTER/SLAVE Configuration Fault2

This bit indicates whether a MASTER/SLAVE configuration fault has been detected by the local PHY. A configuration fault

occurs if both the local and remote PHYs are forced to the same MASTER/SLAVE state, or if no resolution is reached after

seven retries. When such a fault has been detected, this bit is set to “1”, but the PHY continues to renegotiate until the

MASTER/SLAVE configuration is resolved. Once set, this bit is automatically cleared when (and only when) Register 10 is read

via the SMi.

1The state of this register is internally latched when the auto-negotiation state machine enters the ABiLiTY_DETECT state. Changes to the

states of these bits are recognized only at that time. This register is valid only in 1000BASE-T mode.

Bit Name

Access

States

Reset Value Sticky

MASTER/SLAVE Configuration

Fault

RO LH SC

1 = MASTER/SLAVE configuration fault detected

0 = No MASTER/SLAVE configuration fault

detected

MASTER/SLAVE Configuration

Resolution

1 = Local PHY configuration resolved to MASTER

0 = Local PHY configuration resolved to SLAVE

Local Receiver Status

1 = Local receiver OK

(loc_rcvr_status == OK)

0 = Local receiver not OK

(loc_rcvr_status == NOT_OK)

Remote Receiver Status

1 = Remote receiver OK

(rem_rcvr_status == OK)

0 = Remote receiver not OK

(rem_rcvr_status == NOT_OK)

LP 1000BASE-T FDX Capability RO

1 = LP 1000BASE-T FDX capable

0 = LP not 1000BASE-T FDX capable

LP 1000BASE-T HDX Capability RO

1 = LP is 1000BASE-T HDX capable

0 = LP is not 1000BASE-T HDX capable

9:8 Reserved

7:0 idle Error Count

RO SC

00000000

2This bit is valid only when the Page Received bit (6.1) is set to a “1” and if Mii Register bit 9.9 or 9.8 is set.

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