VSC8221 datasheet(54/138 Pages) MICROSEMI

54 / 138 page

VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

54 of 56

18.2 CMODE Bit Descriptions

The following table outlines the mapping of each CMODE bit to a PHY operating condition parameter. Each of the PHY

operating condition parameters is described in detail in Table 27: “PHY Operating Condition Parameter Description”.

Each of the PHY Operating Condition Parameters mentioned in Table 26 above is described in detail in Table 27.

Table 26. CMODE Bit to PHY Operating Condition Parameter Mapping

CMODE Pin Name

‘CMODE Bit’ to ‘PHY Operating Condition Parameter’ Mapping

Bit 3

Bit 2

Bit 1

Bit 0

CMODE0

PHY Address[3]

PHY Address[2]

PHY Address[1]

PHY Address[0]

CMODE1

SFP Mode Disable

PHY Address[4]

SiGDET pin direction

SerDes Line imped-

ance

CMODE2

PHY Operating

Mode[3]

PHY Operating

Mode[2]

PHY Operating

Mode[1]

PHY Operating

Mode[0]

CMODE3

LED Control[1]

SQE Enable

Reserved

Auto-negotiation

Advertisement Con-

trol[1]

Table 27. PHY Operating Condition Parameter Description

PHY Operating

Condition Parame-

ter Name

CMODE Pin Name and

Bit Position

Value

Description

PHY Address[4:0]

CMODE1[2],

CMODE0[3:0]

31-0

Sets the PHY Address used to access PHY Registers when the

PHY’s SMi is in iEEE mode. The value latched is reflected in

Extended Mii Register 23.15:11.

PHY Operating

Mode[3:0]

CMODE2[3:0]

These CMODE bits set the default PHY Operating Mode by setting the

default values of Mii Register 23.15:12,2:1.

0000

802.3z SerDes to CAT5 Media, Clause 37 auto-negotiation

auto-sense enabled.

0100

802.3z SerDes to CAT5 Media, Clause 37 disabled.

0101

SGMii to CAT5 Media, SCLK enabled.

1010

802.3z SerDes to CAT5 Media, Media Connector Mode.

1110

802.3z SerDes to CAT5 Media, Clause 37 enabled.

1111

SGMii to CAT5 Media, SCLK disabled.

LED Control[1]

CMODE3[3]

This sets the default behavior of LED pins LED[2:0] by setting the startup

values of MII Register Bit Register 27 (1Bh) – LED Control Register.

LED[2:0] = {Link10/Activity, Link100/Activity, Link1000/Activity}

(Mii Reg 27 = 0000h)

LED[2:0] = {Link/Activity, Link/Activity, Fault}

(Mii Reg 27 = AA80h)

VSC8221 Datasheet(PDF) 54 Page - Microsemi Corporation

VSC8221 Datasheet(HTML) 54 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

Datasheet Download

Link URL