CS8952T datasheet(19/86 Pages) CIRRUS

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DS206TPP2

CS8952T

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

CIRRUS LOGIC ADVANCED PRODUCT DATABOOK

Table3. 4B5B CodeViolation Decoding

Carrier Sense Operation

The CRS pin (Carrier Sense) is asserted when ei-

ther the transmitter is active or the receiver detects

at least two non-contiguous ZEROS within any 10

bits in the received data stream. Once asserted, it

will remain asserted until the transmitter has gone

idle or the receiver detects 10 consecutive ONES.

CRS is not synchronous to RX_CLK. It may tran-

sition at any time.

Link Integrity Monitor

The link integrity monitor determines whether the

underlying receive channel is providing reliable

data.

When auto-negotiation is disabled, the link is con-

sidered to be stable when the receiver has detected

valid signal levels for at least 1 ms. If the signal

levels fall below the minimum for more than

350 us, the Link Status bit in the Basic Mode Status

Change bit in the Interrupt Status Register (address

11h) is set, and the Disconnect Count Register (ad-

dress 12h) is incremented.

When auto-negotiation is enabled, the link will be

further qualified by the detection 100BASE-X

mode and 12 consecutive IDLE code groups.

Collision Detection

For half duplex, a collision is detected when the re-

ceiver and transmitter are active simultaneously.

Collisions are reported by asserting the COL pin.

Code Violations (RX_ER = 1 or TX_ER = 1)

Name

5-bit Symbol

Normal Mode 4-bit

Nibble

Error Report

Mode 4-bit

Nibble

Comments

CONTROL (Note 1)

CONTROL code groups become violations when found in the data portion of the frame.

11111

0000

This portion of the table relates received

5-bit symbols to received 4-bit nibbles

only. The control code groups may not

be transmitted in the data portion of the

frame.

11000

0000

10001

0000

01101

0000

00111

0000

CODE VIOLATIONS

00100

0000

00000

0110 or 0101 (Note 2)

Invalid code groups are mapped to 5h unless the Code Error Report select bit in the Loopback,

Bypass, and Receiver Error Mask Register (address 18h) is set, in which case invalid code groups are

mapped to 6h.

0001

00001

0110 or 0101 (Note 2)

0111

00010

0110 or 0101 (Note 2)

1000

00011

0110 or 0101 (Note 2)

1001

00101

0110 or 0101 (Note 2)

1010

00110

0110 or 0101 (Note 2)

1011

01000

0110 or 0101 (Note 2)

1100

01100

0110 or 0101 (Note 2)

1101

10000

0110 or 0101 (Note 2)

1110

11001

0110 or 0101 (Note 2)

1111

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