MPC8280 datasheet(1023/1386 Pages) FREESCALE

1023 / 1386 page

ATM Controller and AAL0, AAL1, and AAL5

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

31-63

31.10.4.2 APC Priority Table

Each PHY’s APC priority table holds pointers to the APC scheduling table of each priority level. It resides

in the dual-port RAM. The priority table can hold up to eight priority levels. Table 31-30 shows the

structure of a priority table entry.

31.10.4.3 APC Scheduling Tables

The APC uses APC scheduling tables (one table for each priority level) to schedule channel transmission.

A scheduling table is divided into time slots, as shown in Figure 31-39. Each slot is a half-word entry. Note

that the APC scheduling tables should be cleared before the APC unit is enabled.

Figure 31-39. The APC Scheduling Table Structure

0x09

CPS_ABR

Byte

ABR only. Cells per slot represented as a power of two. User-defined. (For

example, if CPS is 1, CPS_ABR = 0x00; if CPS is 8, CPS_ABR = 0x03.)

0x0A

LINE_RATE_ABR

Hword ABR only. The PHY line rate in cells/sec, represented in TM 4.0 floating-point

format. User-defined.

0xC

REAL_TSTP

Word

Real-time stamp pointer used internally by the APC. Should be cleared initially.

0x10

APC_STATE

Word

Used internally by the APC. Should be cleared initially.

1 Offset values are to APCP_BASE+PHY# × 32. However, in slave mode, the offset is from APCP_BASE regardless of

the PHY address.

Table 31-30. APC Priority Table Entry

Offset

Name

Width

Description

0x00

APC_LEVi_BASE Hword APC level i base address. Pointer to the first slot in the APC scheduling table for

level i. Should be half-word aligned. User-defined.

0x02

APC_LEVi_END

Hword APC level i end address. Pointer to the last slot in the APC scheduling table for

level i. Should be half-word aligned. User-defined.

0x04

APC_LEVi_RPTR Hword APC level i real-time/service pointers. APC table pointers used internally by the

APC. Initialize both pointers to APC_LEVi_BASE.

0x06

APC_LEVi_SPTR Hword

Table 31-29. APC Parameter Table (continued)

Offset1

Name

Width

Description

APC_LEVi_BASE

APC_LEVi_END

Half Word Entry

slot 0

slot 1

slot N

Control

Slot

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