VSC8221 datasheet(72/138 Pages) MICROSEMI

72 / 138 page

VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

72 of 106

106

4.13 – Transmit Remote Fault

This bit is used by the local MAC to communicate a fault condition to the link partner during auto-negotiation. This bit does not

have any effect on the local PHY operation. This bit is automatically cleared following a successful negotiation with the Link

Partner. Note that iEEE Clause-37 provides for two remote fault bits, while Clause-28 provides only a single remote fault bit.

This discrepancy is handled in Mii Extended register bits 16E.2:1 - Remote Fault Mapping Mask and 16E.0 - Remote Fault

Mapping OR.

4.11 – Advertise Asymmetric Pause Capability

This bit is used by the local MAC to communicate Asymmetric Pause Capability to the link partner during auto-negotiation. This

has no effect on PHY operation. Changing this bit in Clause-28 view will also change bit 4.8 in Clause-37 view.

4.10 – Advertise Symmetric Pause Capability

This bit is used by the local MAC to communicate Symmetric Pause Capability to the link partner during auto-negotiation. This

has no effect on PHY operation. Changing this bit in Clause-28 view will also change bit 4.9 in Clause-37 view.

4.9:5 – Advertise Capability

Bits 4.9:5 allow the user to customize the ability information transmitted to the Link Partner during auto-negotiation. By writing a

“1” to any of these bits, the corresponding ability will be advertised to the Link Partner. Writing a “0” to any bit causes the

corresponding ability to be suppressed from transmission. The state of these bits has no other effect on the operation of the

local PHY. Resetting the chip restores the default bit values. Note that the default values of these bits indicate the true ability of

the VSC8221. These bits are not available for read or write in Clause-37 view.

4.4:0 – Advertise Selector Field

Since the VSC8221 is a member of the 802.3 class of PHYs, the Advertise Selector Field defaults to “00001”. These bits are

R/W because the Ethernet standard requires them to be R/W. Changing the value of these bits has no effect on PHY operation.

23.2.6 Register 5 (05h) – Auto-Negotiation Link Partner Ability Register

5.15 – LP Next-Page Transmit Request

Bit 5.15 returns a “1” when the Link Partner implements the Next-Page function and has Next-Page information it wants to

transmit. The state of this bit is valid when the Auto-Negotiation Complete bit (1.5) or the Page Received bit (6.1) is set.

Bit Name

Access States

Reset Value Sticky

LP Next-Page Transmit Request

1 = LP NP transmit request

LP Acknowledge

1 = LP acknowledge

LP Remote Fault

1 = LP remote fault

Reserved

LP Asymmetric Pause Capability

1 = LP Advertise Asymmetric Pause capable 0

LP Symmetric Pause Capability

1 = LP Advertise Symmetric Pause capable

LP Advertise 100BASE-T4 Capability

1 = LP Advertise 100BASE-T4 capable

LP Advertise 100BASE-TX FDX

1 = LP 100BASE-TX FDX capable

LP Advertise 100BASE-TX HDX

1 = LP 100BASE-TX HDX capable

LP Advertise 10BASE-T FDX

1 = LP 10BASE-T FDX capable

LP Advertise 100BASE-T HDX

1 = LP 100BASE-T HDX capable

4:0 LP Advertise Selector Field

LP Advertise Selector Field

00000

VSC8221 数据表(PDF) 72 Page - Microsemi Corporation

VSC8221 数据表(HTML) 72 Page - Microsemi Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载