ST40RA datasheet(18/94 Pages) STMICROELECTRONICS

18 / 94 page

ADCS 7260755H

STMicroelectronics

18/94

ST40RA

5 System configuration

5.5

EMI DACK mapping

For full details of the EMI bank address and bank type mappings refer to

ST40 System Architecture

Manual Volume 2: Bus Interfaces.

Two DACK strobes are supported in this implementation and are mapped as follows:

DACK

[0]: asserted when a transfer from GPDMA channel[1] occurs to an EMI bank configured

as a MPX device,

DACK

[1]: asserted when a transfer from GPDMA channel[2] occurs to an EMI bank configured

as a MPX device.

5.6

EMI address pin mapping

The data width of a connected device is 8, 16 or 32 bits wide. The 16-bit bank must use EDQM3 as

address 1, the LSB address for the device and the 8-bit bank must use EDQM3 as address 1 and

EDQM2 as address 0.

See the

ST40 System Architecture Manual, Volume 2: Bus Interfaces for details of setting the

device type and port size using the EMI configuration registers.

Device type

Port size

Device address 25 to 2

Device address 1

Device address 0

SDRAM

Peripheral

SFlash

™

32-bit

EADDR[25:2]

16-bit

EADDR[24:2]

EDQM3

8-bit

EADDR[23:2]

EDQM3

EDQM2

MPX

EADDR[25:2]

Table 7: Mapping the internal address lines of a connected device

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