M28529G-12 Mindspeed Technologies, M28529G-12 Datasheet - Page 92

• 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

Figure 1-17. Typical T1/E1 Configurations
In the fractional T1/E1 application, the n x 64 kbps link rates are usually supported by relying on the programmable
dividers and clock synthesizers within the M28529 device rather than reliance on the serial clocks themselves. The
clock reference for these dividers and synthesizers is either IMA_SysClk or IMA_RefClk. Whichever input is being
used, it must be an integer multiple of 8 kHz. For IMA_SysClk, the same 24x frequency as shown in
can be used but any frequency in the range of 33 - 66 MHz is permissible, subject to the restrictions discussed in
Section
1.12.4.1.2
The DSL application is similar to the fractional T1/E1 in the sense that the serial clocks are not often used directly
as timing references. The link rates are usually set within the DSL transceiver as a programmable derivative of the
“system clock” provided to that device. In some cases, an 8 kHz Network Timing Reference (NTR) signal affects
the generated rate.
For the IMA frame rates to be locked when operating in the “Master / Internal” configuration, the M28529 and the
DSL transceivers must have clocks that are derived from the same source. Often, this is a simple matter of
connecting the DSL System Clock to the IMA_RefClk pin or using the IMA_SysClk signal as the source of the DSL
System Clock. The “Slave / External” configuration usually relies on the clock synthesizers.
28529-DSH-001-K
1.12.2.
T1/E1
T1/E1
32
DSL Configurations
LIU
LIU
Selection
Clock
Mindspeed Proprietary and Confidential
Mindspeed Technologies
Framer
Framer
1.544 MHz (T1)
2.048 MHz (E1)
32
or
Tx_TRL[1:0]
SPRxClk[0]
SPTxClk[0]
SPRxClk[31]
SPTxClk[31]
®
M28529
IMA_SysClk
IMA_RefClk
1x Clock
Source
1.544 MHz (T1)
2.048 MHz (E1)
37.056 MHz (T1)
49.152 MHz (E1)
Functional Description
Oscillator
or
24x
or
Figure 1-17
77