Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD データシート

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SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

The table below shows the encodings for the TEX, C, B, and S access permission bits.

Note:

1.

The MPU ignores the value of this bit.

 

shows the cache policy for memory attribute encodings with a TEX value is in the range 4-7.

b000

0 

 

Strongly-
ordered

Shareable

-

Device

Shareable

-

1 

0 

0

Normal

Not 
shareable

Outer and inner write-through. No 
write allocate.

1

Shareable

1 

0

Normal

Not 
shareable

Outer and inner write-back. No write 
allocate.

1

Shareable

b001

0 

 

0 

0

Normal

Not 
shareable

1

Shareable

Reserved encoding

-

1 

Implementation defined 
attributes.

-

1 

0

Normal

Not 
shareable

Outer and inner write-back. Write and 
read allocate.

1

Shareable

b010

0

Device

Not 
shareable

Nonshared Device.

Reserved encoding

-

1

x 

Reserved encoding

-

b1B
B

A

A

0

Normal

Not 
shareable

1

Shareable

00

Non-cacheable

01

Write back, write and read allocate

10

Write through, no write allocate

11

Write back, no write allocate