Freescale Semiconductor MPC8260 - Manual (Page 868)

Multi-Channel Controllers (MCCs)
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
28-20 Freescale Semiconductor
0x38 MFLR Hword Maximum frame length register. Defines the longest expected frame for this channel.
(64-Kbyte maximum). The remainder of a frame that is larger than MFLR is discarded
and the LG flag is set in the last frame’s BD. An interrupt request might be generated
(RXF and RXB) depending on the interrupt mask. A frame’s length is considered to
be everything between flags, including CRC. No more data is written into the current
buffer when the MFLR violation is detected.
0x3A MAX_cnt Hword Max_length counter, used by the CP (read-only for the user)
0x3C RCRC Word Temporary receive CRC, used by the CP (read-only for the user)
0x40 N Hword Applies to ITU-T/ANSI SS7 only. Interrupt threshold in octet counting mode (N=16).
See
Section 28.3.4.2, “Signal Unit Error Monitor (SUERM)—SS7 Mode
N_cnt Hword Applies to ITU-T/ANSI SS7 only. Temporary down counter for N (user initialized to
the value of N).
JTSTTmp Word Applies to Japanese SS7 only. Temporary storage for Time-Stamp Register Value.
Used by the CP to implement a 24-ms delay before sending FISU.
0x44 D Hword Signal unit to signal unit error ratio (SUERM parameter, user initialized to 256). See
Section 28.3.4.2, “Signal Unit Error Monitor (SUERM)—SS7 Mode
0x46 D_cnt Hword Applies to ITU-T/ANSI SS7 only. Temporary down-counter for D (user initialized to
the value of D). D_cnt is decremented only when receive buffers are available.
JTTDelay Applies to Japanese SS7 only. FISU retransmission delay (specified in units of
512¨µs). According to the Japanese SS7 standard, the delay should be 24 ms and
thus JTTDelay should be programmed to 24 ms/512 µs = 46.875 (approximately 47).
Hence, the user should program JTTDelay to 0x2F and the RTSCR to generate a 1
µs time stamp period. Refer to
Section 14.3.8, “RISC Time-Stamp Control Register
(RTSCR) ”.
0x48 Mask1 Word Mask for SU filtering, bytes 0-3. See 28.3.4.4, “SU Filtering—SS7 Mode
0x4C Mask2 Hword Mask for SU filtering, byte 4. See 28.3.4.4, “SU Filtering—SS7 Mode
0x4E SS7_OPT Hword SS7 configuration register. See Section 28.3.4.3, “SS7 Configuration Register—SS7
Mode .”
0x50 LRB1_Tmp Word Temporary storage, used by CP for SU filtering.
0x54 LRB2_Tmp Hword Temporary storage, used by CP for SU filtering.
0x56 SUERM Hword Signal unit error rate monitor counter (user initialized to 0). See Section 28.3.4.2,
“Signal Unit Error Monitor (SUERM)—SS7 Mode .”
0x58 LRB1 Word Four first bytes of last received signal unit. Used by CP for SU filtering. See 28.3.4.4,
“SU Filtering—SS7 Mode .”
0x5C LRB2 Hword Fifth byte of last received signal unit. Used by CP for SU filtering. See 28.3.4.4, “SU
Filtering—SS7 Mode
0x5E T Hword SUERM threshold value (user initialized to 64). See Section 28.3.4.2, “Signal Unit
Error Monitor (SUERM)—SS7 Mode .”
0x60 LHDR Word The BSN, BIB, FSN, FIB fields of last transmitted signal unit and result of CRC. Used
by CP for automatic FISU transmission.
0x64 LHDR_Tmp Word Temporary storage, used by CP for automatic FISU transmission.
Table 28-10. Channel-Specific Parameters for SS7 (continued)
Offset
1
Name
2
Width Description