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

StaticMemory Configuration 0–3 registers

Register

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reserved

 

 

 

 

 

PSMC

BSMC

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reserved

 

 

 

EW

PB

PC

Reserved

PM

BMODE

MW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Register bit

assignment

Bits

Access

Mnemonic

Description

 

 

 

 

 

 

D31:21

N/A

Reserved

N/A (do not modify)

 

 

 

 

 

 

D20

R/W

PSMC

Write protect

 

 

 

 

0

Writes not protected (reset value on reset_n)

 

 

 

 

1

Write protected

 

 

 

 

 

 

D19

R/W

BSMC

Buffer enable

 

 

 

 

0

Write buffer disabled (reset value on reset_n)

 

 

 

 

1

Write buffer enabled

 

 

 

Note:

This field must always be set to 0 when a peripheral other

 

 

 

 

than SRAM is attached to the static ram chip select.

 

 

 

 

D18:09

N/A

Reserved

N/A (do not modify)

 

 

 

 

D08

R/W

EW

Extended wait

 

 

 

0 Extended wait disabled (reset value on reset_n)

 

 

 

1 Extended wait enabled

 

 

 

Extended wait uses the Static Extended Wait register to time both

 

 

 

the read and write transfers, rather than the Static Memory Read

 

 

 

Delay 0–3 registers and Static Memory Write Delay 0–3 registers.

 

 

 

This allows much longer transactions.

 

 

 

Extended wait also can be used with the ns_ta_strb signal to allow a

 

 

 

slow peripheral to terminate the access. In this case, the Static

 

 

 

Memory Extended Wait register can be programmed with the

 

 

 

maximum timeout limit. A high value on ns_ta_strb is then used to

 

 

 

terminate the access before the maximum timeout occurs.

 

 

 

Note:

Extended wait and page mode cannot be selected simulta-

 

 

 

 

neously.

252Hardware Reference NS9215

Page 252
Image 252
Digi NS9215 manual Psmc, Bsmc, Buffer enable, Extended wait

NS9215 specifications

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