M28529G-12 Mindspeed Technologies, M28529G-12 Datasheet - Page 101

• 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

In 8-bit mode, each ATM cell consists of 53 bytes. The first five bytes are used for header information. The
remaining bytes are used for payload.
In 16-bit mode, the cell consists of 54 bytes. The first five bytes contain header information. The sixth byte, UDF2,
is required to maintain alignment but is not read by the M2852x. The remaining bytes are used for payload.
1.13.3
1.13.3.1
This is the normal interface for IMA applications and is selected as shown in
It is intended to interface to a single ATM Layer device and appear as a multi-port PHY device.
illustrates the connections to/from the ATM Layer device. The number of “ports” or channels on the IMA Subsystem
is the sum of the number of configured IMA groups plus the number of pass-through facilities. The IMA M28529
requires a unique UTOPIA address for each channel (IMA group or pass-through). There are no restrictions placed
on the address assignment and not all 32 locations are normally used.
In IMA UTOPIA mode, the UTOPIA interface can operate with single Clav/Enb or Dual Clav/Enb handshaking. The
default configuration is for single Clav/Enb handshaking (See register 0xF03 ATMINTFC for more information).
When operated in single Clav/Enb mode, the UTOPIA bus address 0x1F can be configured as a valid port address
and not a null address, note this is nonstandard from the UTOPIA specification and must be supported by
connective devices.
When using dual Clav/Enb mode, Clav0/Enb0 are assigned to addresses 0x0 - 0xF while Clav1/Enb1are assigned
to addresses 0x10 - 0x1F. Note that only the first 4 bits[3:0] of the 5 bit address bus are used internally, bit 4 is
ignored. For example, if Clav is supposed to be active for addresses 0x1 and 0x11, polling with address 0x1 on the
address bus will cause Clav0 to be asserted and Clav1 to be asserted.
If only one channel is programmed, (a single IMA group and no pass-through facilities), then the M28529 can be
compatible with UTOPIA Level 1 by fixing the address lines to a specific value and setting the IMA group’s ATM
address (through the software driver) to that value.
The M28529 provides numerous options to match non-standard UTOPIA controllers. See the
IMA_ATM_UTOPIA_BUS_CTL register, 0x813, for more information.
28529-DSH-001-K
NOTE:
NOTE:
UTOPIA Interface Blocks
IMA UTOPIA
Dual Clav/Enb does not allow multiple M28529 devices to interface with a single ATM Layer
device on the ATM-side UTOPIA Interface. Multiple M28529 devices cannot share one
Utopia bus with an ATM-layer device.
In single Clav mode, address 0x1F can be assigned as a valid port address to enable 32
unique addresses.
The behavior of Clav when a port is not selected can be set to either driven low or tri-state.
See the IMA_ATM_UTOPIA_BUS_CTL register, 0x813, bit 1.
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Table
1-25.
Functional Description
Figure 1-24
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