Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Fiche De Données

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SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

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 

 

0 x

Strongly-ordered

Shareable

–

1 x

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

Outer and inner noncacheable.

1

Shareable

1 x

Reserved encoding

–

1 

0 x

Implementation defined 
attributes.

–

1 

0

Normal

Not 
shareable

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

1

Shareable

b010

0

0 x

Device

Not 
shareable

Nonshared Device.

1 x

Reserved encoding

–

1

x

x

Reserved encoding

–

b1BB

A

A

0

Normal

Not 
shareable

Cached memory BB = outer policy, 
AA = inner policy.

1

Shareable

00

Non-cacheable

01

Write back, write and read allocate

10

Write through, no write allocate

11

Write back, no write allocate