ST40RA datasheet(24/94 Pages) STMICROELECTRONICS

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STMicroelectronics

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ST40RA

5 System configuration

5.9.1

EMI.GENCFG EMI general configuration

EMI.GENCFG

EMI general configuration

0x0028

The EMI provides a generic register to allow the configuration of the padlogic. ST40RA

uses the bits detailed.

0SOFE

Strobe positioning

Strobe on falling edge:

0: Disabled

1: Enabled

Reset: 0

[5:1]

SDPOS

SDRAM bank location

00001: Bank 0

00010: Bank 1

00011: Bank 2

00100: Bank 3

00101: Bank 4

00110: Bank 5

10001: Bank 0 to 1

10010: Bank 0 to 2

10011: Bank 0 to 3

10100: Bank 0 to 4

10101: Bank 0 to 5

10110: Bank 1 to 2

10111: Bank 1 to 3

11000: Bank 1 to 4

11001: Bank 1 to 5

11010: Bank 2 to 3

11011: Bank 2 to 4

11100: Bank 2 to 5

11101: Bank 3 to 4

11110: Bank 3 to 5

11111: Bank 4 to 5

Reset: 0

6EWPU

Pull-up on EWAIT pina

0: Disabled

1: Enabled

Reset: 0

a. If the EWAIT signal is set at the beginning of an access, and the data is to be set after the EWAIT

is cleared, the parameters ACCESSTIMEREAD and LATCHPOINT in the EMI configuration

registers must be set as follows:

ACCESSTIME > LATCHPOINT + 3.

See the

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

configuration registers.

EAPU

Pull-up enable on EADDR pins

0: Disabled

1: Enabled

Reset: 0

[31:8]

Reserved

0: Ignored

1: Reserved

Reset: Undefined

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