STLC1502 datasheet(16/81 Pages) STMICROELECTRONICS

16 / 81 page

STLC1502

16/81

Figure 6: EDM block diagram

It is possible to connect up to 4 external chips with x8, x16, and x32 data bus. Each memory bank space is

8Mbytes big so that a standard 64Mbit DRAM device can be connected. It is not possible to use a single

32Mbytes memory device.

It is the responsibility of the ARM code to properly configure the EDM block to initialize the DRAM at startup.

The external memory is mapped by the EDM interface as shown in Fig. 7.

Figure 7: EDM memory map

In the following table there is the list of the available external signals of the EDM interface.

NAME

Signal type

Description

EDM_CS(3:0)

OUT

Chip

Select.

Asserted

when

the

EDM

decodes the proper address space in order

to select the right external device. To be con-

nected to RAS signal in case of use of EDO

memories

EDM_CLK

OUT

SDRAM Memory clock (same as ARM

clock). Not used with EDO.

EDM_CLKEN

OUT

SDRAM clock enable. Not used with EDO.

External

EDM

11800000

EDM_CS0

EDM_CS1

EDM_CS2

EDM_CS3

13FFFFFF

117FFFFF

11000000

10FFFFFF

10800000

107FFFFF

10000000

Reserved

11FFFFFF

12000000

10000000

13FFFFFF

DRAM

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