2 apc priority table, Table 30-30. apc priority table entry, 3 apc scheduling tables – Freescale Semiconductor MPC8260 User Manual
Page 985: Figure 30-39. the apc scheduling table structure, Apc priority table -65, Apc scheduling tables -65, The apc scheduling table structure -65, Apc priority table entry -65
ATM Controller and AAL0, AAL1, and AAL5
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor
30-65
30.10.4.2 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.
shows the
structure of a priority table entry.
30.10.4.3 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
. Each slot is a half-word entry. Note
that the APC scheduling tables should be cleared before the APC unit is enabled.
Figure 30-39. The APC Scheduling Table Structure
Slot N+1 is used as a control slot, as shown in
.
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_AB
R
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 30-30. 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 30-29. APC Parameter Table (continued)
Offset
1
Name
Width
Description
APC_LEVi_BASE
APC_LEVi_END
Half Word Entry
slot 0
slot 1
slot N
Control
Slot