MPC8280 datasheet(1013/1386 Pages) FREESCALE

1013 / 1386 page

ATM Controller and AAL0, AAL1, and AAL5

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

31-53

31.10.2.3.1

AAL5 Protocol-Specific TCT

Figure 31-31 shows the AAL5 protocol-specific TCT.

Table 31-22 describes AAL5 protocol-specific TCT fields.

0x1C

0–1

—

Reserved, should be cleared.

2–7

PMT

Performance monitoring table. Points to one of the available 64 performance monitoring

tables. The starting address of the table is PMT_BASE+PMT

× 32. Can be changed

on-the-fly.

8–15

TBD_BASE TxBD base. Points to the first BD in the channel’s TxBD table. The 8 most-significant bits

of the address are taken from BD_BASE_EXT in the parameter RAM. The four

least-significant bits of the address are taken as zero.

0x1E

0–11

BNM

Buffer-not-ready interrupt mask. Can be changed on-the-fly.

0 The transmit buffer-not-ready event of this channel is masked. (TBNR event is not

sent to the interrupt queue.)

1 The buffer-not-ready event of this channel is enabled.

STPT

Stop transmit. Should be cleared initially. When the host sets this bit, the CP deactivates

this channel and clears TCT[VCON] when the channel is next encountered in the APC

scheduling table. Note that for AAL5 if STPT is set and frame transmission is already

started (TCT[INF]=1), an abort indication will be sent (last cell with zero length field).

0x1E

IMK

Interrupt mask. Can be changed on-the-fly.

0 The transmit buffer event of this channel is masked. (TXB event is not sent to the

interrupt queue.)

1 The transmit buffer event of this channel is enabled.

Performance monitoring. Can be changed on-the-fly.

0 No performance monitoring for this VC.

1 Performance is monitored for this VC. When a cell is sent for this VC, the performance

monitoring table indicated in PMT field is updated.

Offset + 0x10

Tx CRC

Offset + 0x12

Offset + 0x14

Total Message Length

Figure 31-31. AAL5 Protocol-Specific TCT

Table 31-22. AAL5-Specific TCT Field Descriptions

Offset

Name

Description

0x10

Tx CRC

CRC32 temporary result.

0x14

Total Message Length

This field is used by the CP.

Table 31-21. TCT Field Descriptions (continued)

Offset

Bits

Name

Description

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