Freescale Semiconductor MPC8260 - Manual (Page 866)

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
Table 28-10 describes channel-specific 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).