MPC8280 datasheet(1133/1386 Pages) FREESCALE

1133 / 1386 page

ATM AAL2

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

33-27

Table 33-7 describes the CPS RxQD fields.

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.

Table 33-8 describes the CPS RxBD fields.

Table 33-7. CPS RxQD Field Descriptions

Offset

Bits

Name1

Boldfaced entries must be initialized by the user.

Description

0x00

0–11

—

Reserved, should be cleared during initialization.

RBM

Receive buffer mask.

0 Disable receive buffer interrupt.

1 Enable receive buffer interrupt.

—

Reserved, should be cleared during initialization.

14–15 SubType

SubType. Sublayer type, should be 00 (CPS) for this descriptor.

00 CPS sublayer.

01 CPS switched.

10 SSSAR.

11 Reserved.

0x02

—

RxBD Table

Offset

Holds the offset to the next BD to be opened by the receiver. Should be cleared

during initialization.

0x04

—

RxBD Table

Base

Holds the pointer to the first BD in the BD table.

Offset + 0x00

—

CPS Packet Header

Offset + 0x02

Packet Header

Offset + 0x04

Rx Data Buffer Pointer (RXDBPTR)

Offset + 0x06

Figure 33-17. CPS Receive Buffer Descriptor

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