MPC8280 datasheet(1031/1386 Pages) FREESCALE

1031 / 1386 page

ATM Controller and AAL0, AAL1, and AAL5

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

31-71

31.10.5.5 AAL1 RxBD

Figure 31-47 shows the AAL1 RxBD.

Table 31-36 describes AAL1 RxBD fields.

0x02

—

Data length. The number of octets written by the CP into this BD’s buffer. It is written

by the CP once the BD is closed. In the last BD of a frame, DL contains the total frame

length.

0x04

RXDBPTR Rx data buffer pointer. Points to the first location of the associated buffer; may reside

in internal or external memory. It is recommended that the pointer be burst-aligned.

123456789

Offset + 0x00

—

SNE

—

Offset + 0x02

Data Length

Offset + 0x04

Rx Data Buffer Pointer

Offset + 0x06

Figure 31-47. AAL1 RxBD

Table 31-36. AAL1 RxBD Field Descriptions

Offset

Bits

Name

Description

0x00

Empty

0 The buffer associated with this RxBD is filled with received data or data reception was

aborted due to an error. The core can read or write any fields of this RxBD. The CP

cannot use this BD again while E = 0.

1 The buffer is not full. This RxBD and its associated receive buffer are owned by the

CP. Once E is set, the core should not write any fields of this RxBD.

—

Reserved, should be cleared.

Wrap (final BD in 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 is used,

the CP receives incoming data 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

overall space is constrained to 64 Kbytes.

Interrupt

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

1 An Rx buffer event is sent to the interrupt queue after the ATM controller uses this

buffer. FCCE[GINT

x] is set when the INT_CNT reaches the global interrupt threshold.

SNE

Sequence number error. SNE is set when a sequence number error is detected in the

current AAL1 CES buffer.

—

Reserved, should be cleared.

Table 31-35. AAL5 RxBD Field Descriptions (continued)

Offset

Bits

Name

Description

MPC8280 Datasheet(PDF) 1031 Page - Freescale Semiconductor, Inc

MPC8280 Datasheet(HTML) 1031 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL