Instruction Manual

Maxim/Dallas Semiconductor Confidential Product Preview: DS3161,2,3,4

Rev 1.6 6 of 12 022604

• Framer pass-through mode for clear channel applications and externally defined frame formats

• Built-in support for subrate DS3/E3

3.3 Receive PLCP Framer Features

• PLCP frame synchronization

• C1 cycle/stuff counter interpretation

• Detection of out of frame (OOF), BIP-8 errors, FEBE and RAI (Yellow Signal)

• Frame timing is presented on the 8KREFO output pin

• All path overhead fields presented on the PLCP receive overhead port

3.4 Receive Cell Processor Features

• HEC-based cell delineation within the DS3/E3 frame, the PLCP frame, an externally defined frame,

or the entire line bandwidth

• Cell descrambling using the self-synchronizing scrambler (x

+1) for ATM over DS3/E3 or the

distributed sample scrambler for clear-channel ATM (cell-based physical layer)

• HEC error detection and correction; HEC discard

• Filtering of idle, unassigned and/or invalid cells (provisionable)

• Header pattern comparison vs. 32-bit header pattern and mask registers; counting of matching or non-

matching cells; discard of matching or non-matching cells

• Four-cell Receive FIFO

• Controls include enables/disables/settings for: cell processing, coset polynomial addition, error

correction, erred cell extraction, cell descrambling, idle/unassigned/invalid cell filtering, header

pattern match counting/discarding, LCD integration time

• Status fields include: out of cell delineation (OCD), loss of cell delineation (LCD) and receipt of idle,

unassigned, invalid, erred, corrected or header-pattern-match cells

• Performance monitoring counters for forwarded cells, corrected cells, uncorrectable cells, header

pattern match/no-match cells, and filtered idle/unassigned/invalid cells

3.5 Receive Packet Processor Features

• Packet descrambling using the self-synchronizing scrambler (x

+1)

• Flag detection, packet delineation, and interframe fill discard (flags and all-ones)

• Packet abort detection and accumulation

• Bit or octet destuffing

• FCS checking (16-bit or 32-bit), error accumulation, and FCS discard

• Packet size checking vs. programmable minimum and maximum size registers

• Abort declaration for packets with non-integral number of bytes

• Controls include enables/disables/settings for: packet processing, descrambling, 16/32-bit FCS,

filtering of FCS erred packets, FCS discard, minimum/maximum packet size

• Status fields include: receipt of FCS erred packet, aborted packet, size violation packet, non-integer-

length packets

• Performance monitoring counters for forwarded packets, forwarded bytes, aborted bytes, FCS erred

packets, aborted packets, size violation packets (min, max, non-integer-length)

3.6 Receive FIFO Features

• Storage capacity for four cells or 256 bytes of packet data

• Programmable port address