MFC2000 datasheet(420/426 Pages) ETC

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MFC2000 Multifunctional Peripheral Controller 2000

Hardware Description

24-34

Conexant

100723A

24.8.2 Firmware Operation

There is only one operation in which firmware need be concerned with the CDRAM block. That operation is the

powerup operation. During startup, DRAM and SDRAM both have a specific sequence which needs to be

performed on them in order for them to function properly. In order to assure that this sequence is properly

performed the following must be done:

Wait a minumum of 200us. Some memories require as little as 100us, while a few others require as great as

500us. Waiting 200us will assure that MOST memories will work correctly.

Write to the CDRAM configuration register. This register should be written to ONCE and ONLY ONCE. Unless

this register is written to, CDRAM will not know what type of RAM is being used.

That’s it. After about a 1 us delay the startup procedure should be finished and the memory ready to be

accessed. An access request can be made after the startup procedure is done and before it is finished, but

the access will not occur until the complete startup procedure is finished.

MFC2000 Datasheet(PDF) 420 Page - List of Unclassifed Manufacturers