5238-DS03-405-R datasheet(48/76 Pages) BOARDCOM

48 / 76 page

BCM5238

Advance Data Sheet

1/31/03

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

Page 40

Auxiliary Control/Status Register

Document

5238-DS03-405-R

100BASE-X DISCONNECT COUNTER

SMII Fast RXD. Extended FIFO operation only. Bit 15 of the Disconnect Counter register indicates the FIFO state machine

has detected fast receive data relative to the REF_CLK input.

SMII Slow RXD. Extended FIFO operation only. Bit 14 of the Disconnect Counter register indicates the FIFO state machine

has detected slow receive data relative to the REF_CLK input.

AUXILIARY CONTROL/STATUS REGISTER

Table 30: 100BASE-X Disconnect Counter (Address 20d, 14h)

Bit

Name

R/W

Description

Default

SMII Fast RXD

R/O

1 = In extended FIFO mode, detect fast receive data

0 = Normal

SMII Slow RXD

R/O

0 = Normal

1 = In extended FIFO mode, detect slow receive data

13:8

Reserveda

a. When writing to this register, preserve existing values of reserved bits by completing a Read/Modify Write.

–

000010

7:0

Reserveda

––

00h

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

after read operation. Use default values of reserved bit(s) when writing to reserved bit(s).

Table 31: Auxiliary Control/Status Register (Address 24d, 18h)

Bit

Name

R/W

Description

DEFAULT

Jabber Disable

R/W

1= Jabber function disabled in PHY

0 = Jabber function enabled in PHY

Link Disable

R/W

1= Link integrity test disabled in PHY

0 = Link integrity test is enabled in PHY

13:8

Reserveda

–

000000

7:6

HSQ : LSQ

R/W

These two bits define the squelch mode of the

10BASE-T carrier sense mechanism:

00 = normal squelch

01 = low squelch

10 = high squelch

11 = not allowed

5:4

Edge Rate [1:0]

R/W

00 = 1 nanoseconds

01 = 2 nanoseconds

10 = 3 nanoseconds

11 = 4 nanoseconds

Auto-Negotiation Indicator

1 = Auto-negotiation activated

0 = Speed forced manually

Force 100/10 Indication

1 = Speed forced to 100BASE-X

0 = Speed forced to 10BASE-T

Speed Indication

1 = 100BASE-X

0 = 10BASE-T

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

after read operation. Use default values of reserved bit(s) when writing to reserved bit(s).

5238-DS03-405-R Datasheet(PDF) 48 Page - Broadcom Corporation.

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