5228-DS07-R datasheet(73/100 Pages) BOARDCOM

73 / 100 page

Data Sheet

BCM5228

7/12/04

Broa d c om Co rp o r a t i o n

Document

5228-DS09-405-R

Auxiliary Multiple PHY Register

Page 61

AUXILIARY MULTIPLE PHY REGISTER

HCD. Bits 15:11 of the Auxiliary Multiple PHY register are 5 read-only bits that report the highest common denominator

(HCD) result of the auto-negotiation process. Immediately upon entering the Link Pass state after each reset or restart auto-

negotiation, only 1 of these 5 bits is 1. The Link Pass state is identified by a 1 in bit 6 or 7 of this register. The HCD bits are

reset to 0 every time auto-negotiation is restarted or the BCM5228 is reset.

For their intended application, these bits uniquely identify the HCD only after the first link pass after reset or restart of auto-

negotiation. If the ability of the link partner is different on later link fault and subsequent renegotiations, more than one of the

above bits may be active.

Restart Auto-Negotiation. A self-clearing bit that allows the auto-negotiation process to be restarted, regardless of

the current status of the state machine. For this bit to work, auto-negotiation must be enabled. Writing a 1 to this

bit restarts auto-negotiation. Because the bit is self-clearing, it always returns a 0 when read. The operation of this

bit is identical to bit 9 of the Control register.

Auto-Negotiation Complete. This read-only bit returns a 1 after the auto-negotiation process has been completed. It

remains 1 until the auto-negotiation process is restarted, a link fault occurs, or the chip is reset. If auto-negotiation is disabled

or the process is still in progress, the bit returns a 0.

Table 38: Auxiliary Multiple PHY Register (Address 30d, 1Eh)

Bit

Name

R/W

Description

Default

HCD_TX_FDX

1 = Auto-negotiation result is 100BASE-TX full-duplex

HCD_T4

1 = Auto-negotiation result is 100BASE-T4

HCD_TX

1 = Auto-negotiation result is 100BASE-TX

HCD_10BASE-T_FDX

1 = Auto-negotiation result is 10BASE-T full-duplex

HCD_10BASE-T

1 = Auto-negotiation result is 10BASE-T

10:9

Reserveda

a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”

––

Restart Auto-Negotiation

R/W

(SC)

1 = Restart auto-negotiation process

0 = No effect

Auto-Negotiation Complete

1 = Auto-negotiation process completed

0 = Auto-negotiation process not completed

Acknowledge Complete

1 = Auto-negotiation acknowledge completed

Acknowledge Detected

1 = Auto-negotiation acknowledge detected

Ability Detect

1 = Auto-negotiation waiting for LP ability

Super Isolate

R/W

1 = Super isolate mode

0 = Normal operation

Reserveda

––

10BASE-T Serial Mode

R/W

1 = Enable 10BASE-T serial mode

0 = Disable 10BASE-T serial mode

Reserveda

––

Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear

after read operation.

5228-DS07-R 数据表(PDF) 73 Page - Broadcom Corporation.

5228-DS07-R 数据表(HTML) 73 Page - Broadcom 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

数据表下载

链接网址

5228-DS07-R 数据表(PDF) 73 Page - Broadcom Corporation.

5228-DS07-R 数据表(HTML) 73 Page - Broadcom 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

数据表 下载

链接网址

数据表下载