M16C6S_09 Datasheet, PDF (201/208 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

M16C/6S Group
APPENDIX
IT800DLL Explanatory Note
June 2, 2005
4. Other DLL implementations
In case of using other implementations of the DLL or considering such implementations, please be ad-
vised to consider the following issues:
1. Co-existence: Implementing a different channel access scheme, prioritization levels, packet for-
mats and so forth, will not allow your product to co-exist with other IT800 based products that
may share the same medium. Using the IT800 will enable such co-existence regardless of the
product, the vendor, the application and the protocol used in top of the DLL.
2. Required Knowledge, Time to Market and Cost: Interfacing the DLL is much easier than inter-
facing the PHY. Physical layer interface includes handling of a several interrupts, critical timing
sections and so forth. To be able to do so you require very good understanding of the both the
power line medium and the PHY internal mechanisms and will significantly increase the develop-
ment resources and schedule and as a result the time to market and product cost. In addition
note that not all the PHY internal mechanism can be disclosed as some are in the status of
patent-pending.
3. Overall performance: IT800DLL has been tested and integrated into different Control and Auto-
mation products over many years. The implementation has showed the best performance for
Narrowband Power Line communication modem, when all the algorithms implemented in it were
verified using the networking simulations and in real systems.
5. Summary
As a conclusion, we highly recommend to using IT800 DLL implementation in all type of products using
the IT800 PHY, rather than using the latter by itself.
In case you still wish to self implement the DLL layer, please be sure to consult RENESAS support
engineers.
Copyright © 2005, YITRAN Communications Ltd.
Rev.5.01 Dec 10, 2009 page 201 of 201
REJ03B0014-0501