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AT697F Datasheet(PDF) 31 Page - ATMEL Corporation

Part # AT697F
Description  Rad-Hard 32 bit SPARC V8 Processor
PDF  155 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT697F Datasheet(HTML) 31 Page - ATMEL Corporation

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AT697F ADVANCE INFORMATION
31
7703C–AERO–6/09
Figure 14. RAM Protection Mode Overview
Segment 2
Segment 1
Segment 2
Segment mode (bp = 0)
Write
trap
Block mode (bp = 1)
RAM
RAM
Segment 1
Write
trap
Write
trap
Write
trap
Write
trap
START1
END1
START2
END2
START1
END1
START2
END2
Mask Scheme
Two block protection units are available for RAM area. Each one is controlled through a
write protection register (WPRn). Two major fields are defined : a TAG and a MASK.
•
The TAG defines the 15 most significant bits of the address of the block to be write protected.
•
The Mask specifies which bits of the TAG are really relevant for the protection.
The write protection on the RAM area is enabled setting logical one in WPRx EN. If this bit is
set logical zero, no protection is activated.
Two protection modes can be programmed. If the WPRx BP is set logical one the protection is
active within the segment. If this bit is set logical zero, the exterior of the segment is protected.
Figure 15. RAM Protection Mode Overview
Segment 2
Segment 1
Segment 2
Segment mode (bp = 0)
Write
trap
Block mode (bp = 1)
RAM
RAM
Segment 1
Write
trap
Write
trap
Write
trap
Write
trap



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