MPC8280 datasheet(1033/1386 Pages) FREESCALE

1033 / 1386 page

ATM Controller and AAL0, AAL1, and AAL5

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

31-73

31.10.5.7 AAL1 CES RxBD

Refer to Section 32.12.1, “AAL1 CES RxBD.”

31.10.5.8 AAL2 RxBD

Refer to Section 33.4.4.4, “CPS Receive Buffer Descriptor (RxBD).”

31.10.5.9 AAL5, AAL1 CES User-Defined Cell—RxBD Extension

In user-defined cell mode, the AAL5 and AAL1 CES RxBDs are extended to 32 bytes; see Figure 31-49.

NOTE

For AAL0, a complete cell, including the UDC header, is stored in the

buffer; the AAL0 BD size is always 8 bytes.

Continuous mode

0 Normal operation.

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

to be overwritten automatically when the CP next accesses this BD.

7–9

—

Reserved, should be cleared.

CRE

Rx CRC error. Indicates a CRC10 error in the current AAL0 buffer. The CRE bit is

considered an error only if the received cell had a CRC10 field in the cell payload.

OAM

Operation and maintenance cell. If OAM is set, the current AAL0 buffer contains an OAM

cell. This cell is associated with the channel indicated by the channel code field (CC

field).

12–15

—

Reserved, should be cleared.

0x02

—

DL/CC

Data length/channel code. If RxBD[OAM] is set, this field functions as CC; otherwise, it

is DL. Data length is the size in octets of this buffer (MRBLR value). Channel code

specifies the channel code associated with this OAM cell.

0x04

—

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

either internal or external memory. This pointer must be burst-aligned.

Offset + 0x08

Extra Cell Header.

Used to store the user-defined cell’s extra cell header. The extra cell header can be 1–12 bytes long.

Offset + 0x14

Reserved (12 bytes)

Figure 31-49. User-Defined Cell—RxBD Extension

Table 31-37. AAL0 RxBD Field Descriptions (continued)

Offset

Bits

Name

Description

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