Multi-Channel Controllers (MCCs)
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
28-18 Freescale Semiconductor
Flow control
SS7 features are as follows:
Up to 128 independent communication channels (64 channels per MCC)
Independent mapping for receive and transmit
Standard HDLC features
Flag/Abort/Idle generation/detection
Zero insertion/deletion
16-bit CRC-CCITT generation/checking
Detection of non-octet aligned signal units
Programmable number of flags between signal units
Maintenance of signal unit error monitor (SUERM)
Maintenance of alignment error rate monitor (AERM)
Maintenance of separate counters for error-free and bad frames
Detection and stripping of long signal units
Discard of short signal units (less than 5 octets)
Transmission of signal units with a programmable delay (applies to JT-Q.703 standard)
Automatic transmission of fill-in signal units (FISU)
Automatic retransmission of signal units (for link-status signal unit (LSSU) retransmission)
Automatic discard of identical FISUs and LSSUs using a user-defined mask
Octet counting mode in case of long signal units and receiver overrun
Five circular interrupt tables with programmable size and overflow identification—one for
transmit and four for receive.
Global or individual channel loop modes
Efficient bus usage (no bus usage for inactive channels or for active channels with nothing to send)
Efficient control of interrupts to the CPU
Supports external BD tables
Uses on-chip dual-port RAM for parameter storage
Uses 64-bit data transactions for reading and writing data in BDs
Table28-10 describes channel-spec ific parameters for SS7. Note that a given parameter location may have
a different definition depending on the standard used (ITU-T/ANSI or Japanese standard).