MPC8280 datasheet(1006/1386 Pages) FREESCALE

1006 / 1386 page

ATM Controller and AAL0, AAL1, and AAL5

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

31-46

Freescale Semiconductor

31.10.2.2.1

AAL5 Protocol-Specific RCT

Figure 31-26 shows the AAL5 protocol-specific area of an RCT entry.

Table 31-17 describes AAL5 protocol specific RCT fields.

Offset + 0x0E

TML

Offset + 0x10

RX CRC

Offset + 0x12

Offset + 0x14

RBDCNT

Offset + 0x16

—

Offset + 0x18

—

RXBM RXFM

—

BPOOL

Figure 31-26. AAL5 Protocol-Specific RCT

Table 31-17. RCT Settings (AAL5 Protocol-Specific)

Offset

Bits

Name

Description

0x0E

—

TML

Total message length. This field is used by the CP.

0x10

—

RxCRC

CRC32 temporary result.

0x14

—

RBDCNT

RxBD count. Indicates how may bytes remain in the current Rx buffer. RBDCNT is

initialized with MRBLR whenever the CP opens a new buffer.

0x16

—

Reserved, should be cleared.

0x18

0–7

—

Reserved, should be cleared.

RXBM

Receive buffer interrupt mask. Determines whether the receive buffer event is

disabled. Can be changed on-the-fly.

0 The event is disabled for this channel. (The RXB event is not sent to the interrupt

queue when receive buffers are closed.)

1 The event is enabled for this channel.

RXFM

Receive frame interrupt mask. Determines whether the receive frame event is

disabled. Can be changed on-the-fly.

0 The event is disabled for this channel. (RXF event is not sent to the interrupt queue.)

1 The event is enabled for this channel.

10–13

—

Reserved, should be cleared.

14–15

BPOOL

Buffer pool. Global buffer allocation mode only. Points to one of four free buffer pools.

See Section 31.10.5.2.4, “Free Buffer Pool Parameter Tables.”

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