DS3163 Maxim Integrated Products, DS3163 Datasheet - Page 150

• Manufacturer Part Number: DS3163
• Description: IC TRPL ATM/PACKET PHY 400-PBGA
• Manufacturer: Maxim Integrated Products

Specifications of DS3163

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 400-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DS3161/DS3162/DS3163/DS3164
Error insertion can be initiated by a register bit (PLCP.TEIR.TSEI) or initiated by the manual error insertion input
(TMEI). Each error type is individually enabled by a register bit. The error insertion initiation type (register or input)
is programmable. Once all error insertion has been performed, the data stream is passed on to overhead insertion.
10.8.5.4 Transmit DS3 PLCP Overhead Insertion
Overhead insertion can insert any (or all) of the path overhead bytes into the DS3 PLCP frame. The overhead
bytes Z6 – Z1, F1, B1, G1, M1, M2, and C1 can be sourced from the transmit overhead interface (TPOHCLK,
TPOH, TPOHEN, and TPOHSOF). The B1 and C1 bytes are sourced as error masks (modulo 2 addition of the
input B1/C1 byte and the generated B1/C1 byte). The overhead insertion is fully controlled by the transmit
overhead interface. If the transmit PLCP overhead data enable signal (TPOHEN) is driven high, then the bit on the
transmit PLCP overhead signal (TPOH) is inserted into the output data stream. Insertion of bits using the TPOH
signal overwrites internal overhead insertion.
10.8.6 Receive DS3 PLCP Frame Processor
The DS3 PLCP frame format is shown in
Figure
10-30. A1 and A2 are the subframe Alignment bytes that have a
value of F6h and 28h respectively. P11 – P0 are the Path Overhead Identifier (POI) bytes that indicate the path
overhead byte contained in the current subframe. Z6 – Z1 are growth bytes reserved for future use. F1 is the Path
User Channel byte allocated for user communications purposes (This byte is undefined in ATM). B1 is the Bit
Interleaved Parity-8 (BIP-8) byte used for PLCP path error monitoring. G1 is the PLCP Path Status Byte (See
Figure
10-31) used for far-end path status and performance monitoring (bits 6 – 8 are undefined in ATM). M1 and
M2 are the DQDB Layer Management Information bytes used for DQDB layer management communications
(These bytes are undefined in ATM). C1 is the Cycle/Stuff Counter byte used as for PLCP superframe alignment
and stuff indication.
10.8.6.1 Receive DS3 PLCP Framing
DS3 PLCP framing determines the DS3 PLCP frame boundary. The frame boundary is found by identifying the
frame alignment bytes (A1 & A2), and the path overhead indicator (POI) byte (P#). The framer is an off-line framer
that updates the data path frame counters when an out of frame (OOF) condition is present. The use of an off-line
framer reduces the number of ATM cells discarded during the framing process. The framer continually searches for
two consecutive sets of alignment bytes (A1 and A2), and two sequential POI bytes (P#) are identified. The data
path frame counters are updated if an OOF condition is present. The maximum average reframe time is 17 µs.
10.8.6.2 Receive DS3 PLCP Nibble Destuffing
Nibble destuffing discards the DS3 PLCP frame trailer immediately following subframe 0 (POI equals 01h). The
trailer size is determined by the DS3 PLCP superframe counter, and the cycle counter byte (C1). The trailer is
thirteen nibbles in the first frame of the superframe (C1 equals FFh). The trailer is fourteen nibbles in the second
frame of the superframe (C1 equals 00h). The trailer length is variable in the third frame of the superframe. It is
thirteen nibbles if C1 equals 66h, and fourteen nibbles if C1 equals 99h. The superframe counter is updated
immediately upon receiving an error free C1. In the third superframe, majority voting (5 of 8) is used to determine
the trailer size. Once the trailer size has been determined, the trailer nibbles are discarded.
10.8.6.3 Receive DS3 PLCP Performance Monitoring
Performance monitoring checks the DS3 PLCP frame for errors and alarm conditions. The alarm conditions
detected are OOF, LOF, COFA, and RAI. All alarm conditions are defect conditions. The PLCP Framer does not
integrate alarms for failure conditions.
An Out Of Frame (OOF) condition is declared when two consecutive framing bytes (A1 and A2) or two consecutive
POI bytes (P0 - P11) are erred. An OOF condition is terminated when two sequential POI bytes and two
consecutive framing words (A1 and A2) are error free or the DS3 PLCP framer updates the data path frame
counters.
If the Loss Of Frame (LOF) integration counter is disabled, an LOF condition is declared when an OOF condition
has been continuously present for 1 ms. If the LOF integration counter is enabled, an LOF condition is declared by
the LOF integration counter when the counter has been active for a total of 1 ms. The LOF integration counter is
active (increments count) when an OOF condition is present, it is inactive (holds count) when an OOF condition is