5228-DS07-R datasheet(60/100 Pages) BOARDCOM

60 / 100 page

BCM5228

Data Sheet

7/12/04

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

Page 48

100BASE-X Auxiliary Control Register

Document

5228-DS09-405-R

100BASE-X AUXILIARY CONTROL REGISTER

Transmit Disable. The transmitter can be disabled by writing a 1 to bit 13 of MII register 10h. The transmitter output (TD±)

is forced into a high impedance state.

Bypass 4B5B Encoder/Decoder. The 4B5B encoder and decoder can be bypassed by writing a 1 to bit 10 of MII register

10h. The transmitter sends 5B codes from the TXER and TXD1,TXD0 pins directly to the scrambler. TXEN must be active,

and frame encapsulation (insertion of J/K and T/R codes) is not performed. The receiver places descrambled and aligned

5B codes onto the RXER, RXD1 and RXD0 pins. CRS is asserted when a valid frame is received.

Bypass Scrambler/Descrambler. The stream cipher function can be disabled by writing a 1 to bit 9 of MII register 10h. The

Stream Cipher function can be re-enabled by writing a 0 to this bit.

Bypass NRZI Encoder/Decoder. The NRZI encoder and decoder can be bypassed by writing a 1 to bit 8 of MII register

10h, causing 3-level NRZI data to be transmitted and received on the cable. Normal operation (3-level NRZI encoding and

decoding) can be re-enabled by writing a 0 to this bit.

Table 27: 100-BASE-X Auxiliary Control Register (Address 16d, 10h)

Bit

Name

R/W

Description

Default

15:14

Reserveda

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

–

Transmit Disable

R/W

1 = Transmitter disabled in PHY

0 = Normal operation

12:11

Reserveda

–

Bypass 4B5B Encoder/Decoder

R/W

1 = Transmit and receive 5B codes over RMII

pins

0 = Normal RMII

Bypass Scrambler/Descrambler

R/W

1 = Scrambler and descrambler disabled

0 = Scrambler and descrambler enabled

Bypass NRZI Encoder/Decoder

R/W

1 = NRZI encoder and decoder is disabled

0 = NRZI encoder and decoder is enabled

Bypass Receive Symbol Alignment

R/W

1 = 5B receive symbols not aligned

0 = Receive symbols aligned to 5B boundaries

Baseline Wander Correction Disable

R/W

1 = Baseline wander correction disabled

0 = Baseline wander correction enabled

FEF Enable

R/W

1 = Far-end fault enabled

0 = Far-end fault disabled

4:3

Reserveda

–

Extended FIFO Enable

R/W

1 = Extended FIFO mode

0 = Normal FIFO mode

1:0

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.

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