CS8952T datasheet(55/86 Pages) CIRRUS

55 / 86 page

DS206TPP2

CS8952T

CrystalLAN™ 100BASE-X and 10BASE-T Transceiver

CIRRUS LOGIC ADVANCED PRODUCT DATABOOK

Loopback, Bypass, and Receiver Error Mask Register - Address 18h

Bad SSD

Enable

Bypass 4B5B

Reserved

Bypass

Symbol

Alignment

ENDEC

Loopback

Reserved

Remote

Loopback

Reserved

Strip Preamble

Alternate FDX

CRS

Loopback

Transmit

Disable

Code Error

Report Select

Premature

End Error

Report Select

Link Error

Report Enable

Packet Error

Report Enable

Code Error

Report Enable

BIT

NAME

TYPE

RESET

DESCRIPTION

Bad SSD Enable

Read/Write 1

When set, this bit enables the reporting of a bad SSD

(False-Carrier event) on the MII. These events will be

reported by setting RX_ER=1, RX_DV=0, and

RXD[3:0]=1110.

If the 4B5B encoders are being bypassed, this event

will be reported by setting RX_DV=0 and

RXD[4:0]=11110. If symbol alignment is bypassed,

the CS8952T does not detect carrier, and thus will not

report bad SSD events.

Bypass 4B5B

Read/Write Reset to the value

on the BP4B5B

pin.

When set, this bit causes the receive 5B4B decoder

and the transmit 4B5B encoder to be bypassed.

Reserved

Read/Write Reset to 0.

Reserved bit, should remain at zero.

Bypass Symbol

Alignment

Read/Write Reset to the value

on the BPALIGN

pin.

When set, this bit causes the following functions to be

bypassed: receiver descrambling, symbol alignment

and decoding, transmit symbol encoding, and trans-

mit scrambling.

ENDEC Loopback

Read/Write 0

When set, the 10BASE-T internal Manchester

encoder output is connected to the decoder input.

When clear, the CS8952T is configured for normal

operation.

Reserved

Read/Write 0

This bit is reserved.

Remote Loopback

Read/Write 0

When set, data received from the link is looped back

at the MII and sent back out to the link. Received data

will be presented on the MII pins. Transmit data at the

MII will be ignored.

Note: Setting Remote Loopback and PMD Loopback

simultaneously will cause neither loopback mode to

be entered, and should not be done.

CS8952T Datasheet(PDF) 55 Page - Cirrus Logic

CS8952T Datasheet(HTML) 55 Page - Cirrus Logic

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