M28529G-12 Mindspeed Technologies, M28529G-12 Datasheet - Page 19

• Manufacturer Part Number: M28529G-12
• Description: ATM IMA 8.192Mbps 1.8V/3.3V 484-Pin BGA
• Manufacturer: Mindspeed Technologies

Specifications of M28529G-12

• Package: 484BGA
• Utopia Type: Level 2
• Typical Operating Supply Voltage: 1.8|3.3 V
• Minimum Operating Supply Voltage: 1.71|3.135 V
• Maximum Operating Supply Voltage: 1.89|3.465 V
• Maximum Output Rate: 8.192 Mbps

1.1.2.2
The IMA Standard defines three types of IMA cells: IMA Control Protocol (ICP) cells, Filler cells, and ATM layer
cells. ICP cells are the IMA overhead cells that carry the IMA control and status information between both ends of
the link, assuring synchronization and configuration. The purpose of filler cells is rate decoupling; they are inserted
into the IMA stream if no ATM layer cells are available.
ATM layer cells are the data “payload” carried by the IMA group. These are the standard ATM cells being sent from
the ATM layer.
Table 1-1
Table 1-1.
28529-DSH-001-K
Octet
1-5
10
11
12
6
7
8
9
describes the IMA Overhead Cell definition, and
Link Stuff Indication (LSI)
Frame Sequence Number
Status / Control Change
IMA Overhead Cell Definition (1 of 3)
Indication (SCCI)
ATM Cell Header
ICP Cell Offset
NOTE:
IMA Control Protocol Cells
IMA Label
Link ID
IMA ID
Cell ID
Field
Standard ATM 'idle' cells are never transmitted over an IMA link.
OAM cell type: Octet 1 = 0000 0000
OAM type field:
Bit 7 Set to 1 for ICP cell
Bits 6–5 Unused and set to 0
Bits 4–0 Logical ID for physical link range (0... 31)
Cyclical counter: 0 to 255
Indicates position of ICP cell within the IMA frame of size M cells. Range: (0... M – 1)
Stuff Indication code for link on which ICP cell is being sent
Bits 7–3 Unused and set to 0
Bits 2–0 111: no imminent stuff (default)
Status and Control Change Indication: 0 to 255 and cycling (count to be incremented every time there is
a change to octets 12 to 49).
Logical IMA group ID
Mindspeed Proprietary and Confidential
Mindspeed Technologies
Octet 2 = 0000 0000
Octet 3 = 0000 0000
Octet 4 = 0000 1011
Octet 5 = 0110 0100 (valid HEC with Coset)
0000 0001—IMA Version 1.0
0000 0011—IMA Version 1.1
100: stuff event in 4 ICP cell locations (optional)
011: stuff event in 3 ICP cell locations (optional)
010: stuff event in 2 ICP cell locations (optional)
001: stuff event at the next ICP cell location (mandatory)
000: This is one out of the 2 ICP cells comprising the stuff event (mandatory)
Table 1-2
®
lists format of the IMA Overhead Stuff Cell.
Description
Functional Description
4