Motorola MPC8260 User Manual

29-46

MOTOROLA

29.10.2.2.1  AAL5 Protocol-SpeciÞc RCT
Figure 29-26 shows the AAL5 protocol-speciÞc area of an RCT entry. 

0x04

Ñ

RxDBPTR

Receive data buffer pointer. Holds real address of current position in the Rx buffer.

0x08

Ñ

Cell Time 

Stamp

Used for reassembly time-out. Whenever a cell is received, the MPC8260 time stamp 
timer is sampled and written to this Þeld. See Section 13.3.7, ÒRISC Time-Stamp 
Control Register (RTSCR).Ó

0x0C

Ñ

RBD_Offset RxBD offset from RBD_BASE. Points to the channelÕs current BD. User-initialized to 

0; updated by the CP.

0x0E-
0x18

Ñ

Protocol-speciÞc area.

0x1A

Ñ

MRBLR

Maximum receive buffer length. Used in both static and dynamic buffer allocation. 

0x1C

0Ð1

Ñ

Reserved, should be cleared.

2Ð7

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-ßy.

8Ð15

RBD_BASE RxBD base. Points to the Þrst BD in the channelÕs RxBD table. The 8 most-signiÞcant 

bits of the address are taken from BD_BASE_EXT in the parameter RAM. The four 
least-signiÞcant bits of the address are taken as zeros. 

0x1E

0Ð11

12Ð14

Ñ

Reserved, should be cleared.

15

PM

Performance monitoring. Can be changed on-the-ßy.
0 No performance monitoring for this VC.
1  Perform performance monitoring for this VC. Whenever a cell is received for this VC 

the performance monitoring table that its code is written in the PMT Þeld is updated.

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Offset + 0x0E

TML

Offset + 0x10

RX CRC

Offset + 0x12

Offset + 0x14

RBDCNT

Offset + 0x16

Ñ

Offset + 0x18

Ñ

RXBM RXFM

Ñ

BPOOL