Motorola MPC8260 - Manual (Page 827)

29-47 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA
Part IV. Communications Processor Module
Table 29-17 describes AAL5 protocol speciÞc RCT Þelds.
29.10.2.2.2 AAL5-ABR Protocol-SpeciÞc RCT
Figure 29-27 shows the AAL5-ABR protocol-speciÞc area of an RCT entry.
Table 29-17. RCT Settings (AAL5 Protocol-Specific)
Offset Bits Name Description
0x0E Ñ TML Total message length. This Þeld is used by the CP.
0x10 Ñ RxCRC CRC32 temporary result.
0x14 Ñ RBDCNT RxBD count. Indicates how may bytes remain in the current Rx buffer. RBDCNT is
initialized with MRBLR whenever the CP opens a new buffer.
0x16 С С Reserved, should be cleared.
0x18 0Р7 С Reserved, should be cleared.
8 RXBM Receive buffer interrupt mask. Determines whether the receive buffer event is disabled.
Can be changed on-the-ßy.
0 The event is disabled for this channel. (The RXB event is not sent to the interrupt queue
when receive buffers are closed.)
1 The event is enabled for this channel.
9 RXFM Receive frame interrupt mask. Determines whether the receive frame event is disabled.
Can be changed on-the-ßy.
0 The event is disabled for this channel. (RXF event is not sent to the interrupt queue.)
1 The event is enabled for this channel.
10Р13 С Reserved, should be cleared.
14Ð15 BPOOL Buffer pool. Global buffer allocation mode only. Points to one of four free buffer pools. See
Section 29.10.5.2.4, ÒFree Buffer Pool Parameter Tables.Ó
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Offset + 0x0E AAL5 Protocol-SpeciÞc
Offset + 0x10
Offset + 0x12
Offset + 0x14
Offset + 0x16 PCR
Offset + 0x18 RDF RIF AAL5 Protocol-SpeciÞc
Figure 29-27. AAL5-ABR Protocol-Specific RCT