MPC8280 datasheet(1139/1386 Pages) FREESCALE

1139 / 1386 page

ATM AAL2

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

33-33

Table 33-12 describes the SSSAR RxBD fields.

Table 33-12. SSSAR RxBD Field Descriptions

Offset

Bits

Name1

Description

0x00

Empty

0 The buffer associated with this RxBD is full or data reception was aborted due to an

error. The core can read or write any fields of this RxBD. The CP does not use this

BD again while E remains zero.

1 The buffer associated with this RxBD is empty or reception is in progress. This RxBD

and its receive buffer are controlled by the CP. Once E is set, the core should not

write any fields of this RxBD.

Continuous mode

0 Normal operation

1 The CP does not clear E after this BD is closed, allowing the associated buffer to

be reused automatically when the CP next accesses this BD. However, the E bit is

cleared if an error occurs while receiving, regardless of the CM bit setting.

Wrap (final BD in the table)

0 This is not the last BD in the RxBD table of the current channel.

1 This is the last BD in the RxBD table of this current channel. After this buffer has

been used, the CP receives incoming data for this channel into the first BD in the

table. The number of RxBDs in this table is programmable and is determined only

by the W bit. The current table cannot exceed 64 Kbytes.

Interrupt

0 No interrupt is generated after this buffer has been serviced.

1 An Rx buffer event is sent (provided that RxQD[RBM] is set) to the interrupt queue

after this buffer is serviced. The GHIN/GLIN bit in the event register is set when the

INT_CNT counter reaches terminal count.

Last. Set by the CP.

0 This is not the last buffer of the SSSAR SDU.

1 This is the last buffer of the SSSAR SDU.

5–6

RxError

Rx error occurred

00 No Rx error occurred

01 TE—Ras_Timer expired. The Ras Timer expired before this buffer could be

completed. The SSSAR SDU stored in this buffer is not completed.2

10 US—Uncompleted SDU. A receive error caused a packet belonging to this

SSSAR SDU to be lost. The receiver discarded the rest of this SSSAR SDU.

11 OS—Oversized. The size of the SSSAR SDU has exceeded the

Max_SSSAR_SDU_Size parameter. The rest of the SDU was discarded.

7–10

—

Reserved, should be cleared during initialization.

11–15

UUI

Contains the UUI of the last packet in the received SDU. Valid only where the L bit is

set.

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