Intel
®
EP80579 Integrated Processor Product Line—Time Division Multiplex (TDM) Interface
Intel
®
EP80579 Integrated Processor Product Line
Platform Design Guide May 2010
248 Order Number: 320068-005US
23.0 Time Division Multiplex (TDM) Interface
Time Division Multiplex (TDM), also referred to as High-Speed Serial (HSS), is a
hardware module whose primary function is to provide connectivity between EP80579
and external devices such as SLICs and CODECs. There is a total of three TDM ports,
which can support a total of 12-T1/E1 or 4-T1/E1 per port. Typical applications include
voice/data through voice-over broadband systems for CODECs and DSL framers. TDM
ports are software configured to support various serial protocols, such as T1/ E1/J1,
and MVIP.
23.1 Development Board TDM Support
The Development Board supports a total of three mezzanine card connectors. Each
connector supports two TDM ports. This was done to maintain compatibility with
previous voice mezzanine cards such as the Intel
®
EPAVM80579 Analog Voice Card and
future mezzanine cards which might require two TDM ports. Currently the Intel
®
EPAVM80579 card only makes use of a single TDM port, the second port is not used.
23.2 SLIC/CODEC Interface
One of the most common devices used in voice applications, such as telephony, are
SLIC/CODEC modules which are used to encode voice analog signals to digital signals
in a very common mode called TDM encoding. Data moves through the TDM port, in
both directions from the SLIC/CODEC to the EP80579 TDM or from the EP80579 to the
SLIC/CODEC. The device also requires configuration and control service, which is
normally done via the Synchronous Serial Port (SSP) interface.
23.3 Device Connection
Figure 151 shows a typical interconnect between the EP80579 and four SLIC/CODEC
devices. The diagram does not represent the interconnect of SLIC/CODECs in the
Development Board design. The diagram is meant to show how to interface in a simple
manner, bypassing CPLDs and FPGAs in a platform design. To avoid software changes,
you must follow the design guidelines provided by the Development Board.
The SLIC/CODEC devices used for this example are from Silicon Laboratories* and
have been used in a number of evaluation platforms. See the Intel
®
EPAVM80579
Analog 4x1 Card design for details on the components used.
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