Motorola PowerQUICC II MPC8280 Series Reference Manual page 1197

Table 33-7 describes the CPS RxQD fields.
Offset Bits Name
0x00 0–11 —
12 RBM
13 —
14-15 SubType
0x02 — RxBD Table
Offset
0x04 — RxBD Table
Base
1
Boldfaced entries must be initialized by the user.
33.4.4.4 CPS Receive Buffer Descriptor (RxBD)
The CPS RxBD structure consists of a BD table that points to data buffers. The RxBDs
contain, apart from the buffer pointer, the packet header, as shown in Figure 33-17. The
buffers contain the packet payload.
0 1
Offset + 0x00 E CM
Offset + 0x02
Offset + 0x04
Offset + 0x06
Figure 33-17. CPS Receive Buffer Descriptor
MOTOROLA
Freescale Semiconductor, Inc.
Table 33-7. CPS RxQD Field Descriptions
1
Reserved, should be cleared during initialization.
Receive buffer mask.
0 Disable receive buffer interrupt.
1 Enable receive buffer interrupt.
Reserved, should be cleared during initialization.
SubType. Sublayer type, should be 00 (CPS) for this descriptor.
00 CPS sublayer.
01 CPS switched.
10 SSSAR.
11 Reserved.
Holds the offset to the next BD to be opened by the receiver. Should be cleared
during initialization.
Holds the pointer to the first BD in the BD table.
2 3 4 6
W I —
Rx Data Buffer Pointer (RXDBPTR)
Chapter 33. ATM AAL2
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Description
7 8
UP CPS Packet Header
Packet Header
AAL2 Receiver
15
33-29