VSC8221 datasheet(103/138 Pages) MICROSEMI

103 / 138 page

VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

103 of 106

106

22E.7:0 - EEPROM Write Data

When an EEPROM write is initiated by setting bits 21E.13 to a “1” and clearing bit 21E.12, the data from these bits is written to

the EEPROM.

23.3.8 Register 23E (17h) - Extended PHY Control Register #4

23E.15:11 - PHY Address

These bits contain the PHY address of the current PHY port. The reset value of these bits is determined by the PHY Address

bits in the CMODE hardware configuration.

23E.10 - Enable in-line Powered Device Detection

When bit 23E.10 is set to a “1”, the VSC8221 will search for devices requiring CAT-5 in-line power as part of the auto-

negotiation process.

23E.9:8 - in-line Powered Device Detection Status

Bits 23E.9:8 are used by the station manager to determine if a device which requires in-line power is connected to the

VSC8221.

23E.7:0 - CRC Counter

When the Ethernet Packet Generator is enabled by setting Mii Register 29.15, these bits count the number of packets received

that contain a CRC error. This counter will saturate at FFh and is cleared when read.

23.3.9 Register 24E (18h) - Reserved

24E.15:0 - Reserved

Bit

Name

Access States

Reset Value Sticky

15:11 PHY Address

PHY address latched on reset

CMODE

Enable in-line Powered Device

Detection

R/W

1 = in-line powered device detection is enabled

0 = in-line powered device detection is disabled

9:8

in-line Powered Device Detection

Status

00 = Searching for devices

01 = Device found which requires in-line power

10 = Device found which does not require in-

line power

11 = Reserved

7:0

CRC Counter

RO SC

CRC counter for Ethernet packet generator

00000000

Bit

Name

Access

States

Reset Value

Sticky

15:0

Reserved

00000000 00000000

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