m28529-12 Mindspeed Technologies, m28529-12 Datasheet - Page 102

• Manufacturer Part Number: m28529-12
• Description: Inverse Multiplexing For Atm Ima Family
• Manufacturer: Mindspeed Technologies

Figure 1-24. ATM Layer UTOPIA Interface Connections
1.13.3.2
This interface is selected when using the device as a stand-alone cell delineator. See
interfaces to the ATM layer as a normal UTOPIA Level 2 interface with the following enhancements.
UDF2 Programmability
The user can program the contents of the UDF2 byte when operating in 16-bit UTOPIA mode. By default, the
contents of the UDF2 byte on the receive interface will match the default value of the UTOPIA port address. This
can be changed by writing the desired value to the corresponding UDF2 control register, 0x0F. Bus width is
controlled by bit 5 of the ATMINTFC register.
Port Number Assignment
The UTOPIA address for each port is stored in bits 0–4 of the UTOP2 register (0x0E). The default for this value is
the port number. For example, the UTOP2 register for port 4 (0x10E [with the offset]) defaults to 04 hex. However,
the value can be changed to any value from 00–1E hex by programming the register to accommodate multiple
devices on the same UTOPIA bus. The value 1F hex is reserved for the null address. The UTOPIA address should
be changed only when the device or port is in the reset state.
HEC Override
In normal operation, the HEC is calculated by the TC layer and put in byte 5, UDF1. This may be overridden by
setting bit 7 of the CGEN register (0x08) to a 1. In this case, data inserted by the ATM layer into byte 5 is
transmitted unchanged by the device.
Table 1-25.
28529-DSH-001-K
(ATMINTFC, 0xF03)
ATMMux [7,6]
Note: Only Transm it side drawn for Clarity
01
01
10
Device Configuration Options
ATM Layer
Device
TC Block UTOPIA
PhyIntFcSel
(Pin AD24)
High
High
Low
atm UTxClav_0
atm UTxClav_1
atm UTxEnb_0
atm UTxEnb_1
atm UTOPIA Tx data/
Mindspeed Proprietary and Confidential
Mindspeed Technologies
address bus
IMA UTOPIA using the PHY Side UTOPIA; UTOPIA-to-UTOPIA; TC block/serial ports not
used.
IMA UTOPIA using Internal TC block;
UTOPIA-to-Serial mode; 32 internal serial ports
TC only; Device used as Stand-alone cell delineator with 32 serial ports; IMA block not
used.
M28529
®
Description
Table 1-25
Functional Description
and
PHY Layer
Utopia Bus
Section
1.6. It
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