VSC9112 Просмотр технического описания (PDF) - Vitesse Semiconductor

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VSC9112

STS-48c Physical Layer Packet/ATM Over SONET/SDH Device

Vitesse Semiconductor 

VITESSE

SEMICONDUCTOR CORPORATION

STS-48c Physical Layer

Packet/ATM Over SONET/SDH Device

Datasheet

VSC9112

• The expected Address and Control Field values are programmable.

• The Protocol Field declaration and processing is programmable.

• The Abort Sequence is detected in the incoming HDLC frames.

• The received Frame Check Sequence (FCS) field is verified. The FCS checksum is calculated using either

a 16-bit, CRC-CCITT generating polynomial 1 + x5 + x12 + x16, or a 32-bit, CRC-32 generating polyno-

mial 1 + x + x2 + x4 + x5 + x7 + x8 + x10 + x11 + x12 + x16 + x22 + x23 + x26 + x32.

• The received data is descrambled with the self synchronizing scrambler (SSS) polynomial 1 + x43. Full

and/or partial descrambling can be independently enabled/disabled.

• Long and short packet checking are provided and are programmable.

• Self Describing Padding is supported and programmable.

• The storage of the PPP Protocol Field in the Rx FIFO may be enabled/disabled.

• The size of the Rx FIFO size is 4095 words, which may accommodate storage for a total of 16380 PPP

Protocol/Information Field bytes.

• The definition of received “errored” HDLC frames is programmable. For these errored HDLC frames two

different procedures can be applied.

• A filtering function is provided to perform packet discartion and error marking based on a set of program-

mable labels. There are four programmable label matching triggers, and one compliment word matching

trigger that functions the packet discard and TERR marking.

• The following statistics are provided in the performance monitoring 32-bit counters:

• Received Aborted HDLC frames

• Received FCS errored HDLC frames

• Received Empty HDLC frames

• Received HDLC frames where Address-and-Control-Field-Compression was found

• Received Long packets

• Received Short packets

• Received Invalid Frames

• Received bytes pre-octet destuffing

• Received bytes post-octet destuffing

• Received number of frames excluding Invalid Frames

• Packets discarded by label filtering

• Packets error-marked by label filtering

• Packets stored in the Rx FIFO

• Packets stored in the Rx FIFO that are error marked

• Packet bytes stored in the Rx FIFO

• Number of received PPP padding bytes

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© VITESSE SEMICONDUCTOR CORPORATION

741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896

G52210-0, Rev. 4.3

3/30/00

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