Texas Instruments TMS320DM355 External Memory Interface Emif, Asynchronous Emif Aemif, OneNAND

PRODUCT PREVIEW

TMS320DM355

Digital Media System-on-Chip (DMSoC)

www.ti.com

SPRS463A –SEPTEMBER 2007 –REVISED SEPTEMBER 2007

5.7 External Memory Interface (EMIF)

supports several memory and external device interfaces, including:

∙Asynchronous EMIF (AEMIF) for interfacing to SRAM.

∙OneNAND flash memories

∙NAND flash memories

5.7.1Asynchronous EMIF (AEMIF)

The EMIF supports the following features:

∙SRAM, etc. on up to 2 asynchronous chip selects addressable up to 64KB each

∙Supports 8-bit or 16-bit data bus widths

∙Programmable asynchronous cycle timings

∙Supports extended wait mode

∙Supports Select Strobe mode

5.7.1.1NAND (NAND, SmartMedia, xD)

The NAND features of the EMIF are as follows:

∙NAND flash on up to 2 asynchronous chip selects

∙8 and 16-bit data bus widths

∙Programmable cycle timings

∙Performs 1-bit and 4-bit ECC calculation

∙NAND Mode also supports SmartMedia/SSFDC (Solid State Floppy Disk Controller) and xD memory cards

5.7.1.2OneNAND

The OneNAND features supported are as follows.

∙NAND flash on up to 2 asynchronous chip selects

∙Only 16-bit data bus widths

∙Supports asynchronous writes and reads

∙Supports synchronous reads with continuous linear burst mode (Does not support synchronous reads with wrap burst modes)

∙Programmable cycle timings for each chip select in asynchronous mode

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