RM0319 datasheet(103/368 Pages) STMICROELECTRONICS

部品番号	RM0319

部品情報	SPEAr320S architecture and functionality

PDF	368 Pages

Scroll/Zoom	100%

メーカー	STMICROELECTRONICS [STMicroelectronics]

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103 / 368 page

RM0319

Parallel NAND Flash controller (FSMC)

Doc ID 022640 Rev 3

103/368

Attribute memory space access

The only difference with respect to common memory space access mode is that the timings

used are specified in the register GenMemCtrl_Attrib. In practice, this secondary access

works exactly the same as common memory space accesses, but this can be used to

implement a functionality that is needed in some (but not all) NAND Flash memories.

Some Flash memories require that after writing the last part of the address, the controller

has to wait and check that R/B (the wait signal from the Flash) goes low. This pre-wait time

can be up to 100ns, then if there is such event the controller has to wait again until R/B goes

high. During all this period CE must be held low.

Other NAND Flash memories (such as the Samsung 1Gbit) do not require the pre-wait time;

they just require that when the memory is being accessed and R/B is low, the controller

should wait until R/B goes high.

RM0319 データシート(PDF) 103 Page - STMicroelectronics