MPC8280 datasheet(1199/1386 Pages) FREESCALE

1199 / 1386 page

Inverse Multiplexing for ATM (IMA)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

34-53

34.4.10 Changing IMA Version

A new CPCR command has been added to the IMA microcode to change the IMA version on-the-fly

without software intervention. Use the following procedure:

1. Before issuing the command, the user should initialize the COMM_INFO fields in the parameter

RAM as described in Figure 34-31.

2. To issue this FCC command, refer to Section 14.4, “Command Set.” Use opcode 1110(0xD).

3. Wait for the CPCR[FLG] to be cleared by the CPM before issuing a new CP command. Refer to

Section 14.4, “Command Set.”

34.5

IMA Software Interface and Requirements

34.5.1

Software Model

The IMA microcode facilitates the implementation of the lower levels of an IMA system. Host software

(from here on, “host software” is code running on the G2_LE core) is responsible for initializing MPC8280

IMA data structures, establishing and tearing down connections, handling of alarms, keeping statistics, and

controlling protocol state machines. The IMA microcode interfaces to the software-implemented (layer

management and plane management) functions by providing received ICP cells and by interrupts. The

software-implemented functions control the microcode and the system via the IMA root, group, and link

parameters and by providing an ICP cell template to the microcode for ICP cell transmission.

0x86

—

ITG

—

0x88

Filler CRC

0x8A

—

Figure 34-31. COMM_INFO Field

Table 34-29. COMM_INFO Field Descriptions

Offset

Bits

Name

Description

0x86

0–8

—

Reserved, should be cleared.

9–11

ITG

IMA transmit group. Program to the IMA group number [0–7] multiplied by 16 bytes. For

example, if the IMA group number = 3, program ITG to 0x30.

12–15 —

Reserved, should be cleared.

0x88

0–15

Filler CRC Filler cell CRC. Set to 0xC602 (for IMA version 1.0) or 0xD902 (for IMA version 1.1)

0x8A

0–13

—

Reserved, should be cleared.

14–15 IV

IMA version

00 Reserved

01 IMA version 1.0

10 Reserved

11 IMA version 1.1

MPC8280 Datasheet(PDF) 1199 Page - Freescale Semiconductor, Inc

MPC8280 Datasheet(HTML) 1199 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL