Motorola PowerQUICC II MPC8280 Series Reference Manual page 1193

33.4.4 AAL2 RX Data Structures
The following sections describe the receive connection tables and the structures in which
CPS packets and SSSAR SDUs are stored in memory.
33.4.4.1 AAL2 Protocol-Specific RCT
The receive connection table (RCT) is a VC-level table and is where the AAL type for the
ATM channel number is selected. The parameters related to the ATM channel number or to
all the RX Queues of the ATM channel are maintained here. The RCT also contains the
pointer to the CID mapping table for the ATM VC. Figure 33-15 shows the AAL2-specific
RCT.
0 1 2
Offset + 0x00 — GBL
Offset + 0x02
Offset + 0x04
Offset + 0x06
Offset + 0x08
Offset + 0x0A
Offset + 0x0c
Offset + 0x0e
Offset + 0x10
Offset + 0x12
Offset + 0x14
Offset + 0x16
Offset + 0x18
Offset + 0x1A
Offset + 0x1C —
Offset + 0x1E Max_CPS_SDU_Deliver_length
Figure 33-15. AAL2 Protocol-Specific Receive Connection Table (RCT)
For an active channel, the CP uses a burst cycle to fetch the
32-byte RCT and writes back only the first 24 bytes.
MOTOROLA
Freescale Semiconductor, Inc.
3 4 5 6 7
BO — DTB BIB
—
CID Mapping Table Base
PMT
NOTE
Chapter 33. ATM AAL2
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8 9 10 11
— SEGF ENDF
—
TBNR Time OUT CNT
—
AAL2 Receiver
12 13 14 15
— MAP INTQ
NoSTF AAL
EM PM
33-25