M E M O R Y C O N T RO L L E R

. . .

Static Memory Extended Wait register. .

S t a t i c M e m o r y E x t e n d e d W a i t r e g i s t e r

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Address: A070 0080

The Static Memory Extended Wait register times long static memory read and write transfers (which are longer than can be supported by the Static Memory Read Delay registers or the Static Memory Write Delay registers) when the EW (extended wait) bit in the related Static Memory Configuration register is enabled.

There is only one Static Memory Extended Wait register, which is used by the relevant static memory chip select if the appropriate EW bit is set in the Static Memory Configuration register.

It is recommended that this register be modified during system initialization, or when there are no current or outstanding transactions. If necessary, however, these control bits can be changed during normal operation.

Register

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reserved

 

 

 

 

 

 

EXTW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Register bit

assignment

Bits

Access

Mnemonic

Description

 

 

 

 

 

 

D31:10

N/A

Reserved

N/A (do not modify)

 

 

 

 

 

 

D09:00

R/W

EXTW

External wait timeout

 

 

 

 

0x0

 

 

 

 

16 clock cycles, where the delay is in clk_out cycles

 

 

 

 

0x1-0x3FF

 

 

 

 

(n=1) x 16 clock cycles

Example

 

 

Static memory read/write time = 16 μs

 

 

CLK frequency = 50 MHz

 

This value must be programmed into the Static Memory Extended Wait register: (16 x 10-6x 50 x 106 / 16) - 1 = 49

D y n a m i c M e m o r y C o n f i g u r a t i o n 0 – 3 r e g i s t e r s

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Address: A070 0100 / 0120 / 0140 / 0160

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Digi NS9215 A t i c M e m o r y E x t e n d e d W a i t r e g i s t e r, Example, Address A070 0100 / 0120 / 0140, Extw

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