Altera Advanced SEU Detection IP Core Manuale Utente Scaricare il pdf (Pagina 21)

• Offset array for current frame = offset_map_array_index * offset_map_length

• Offset data value for current byte and bit = [(byte * 8) + bit] * 2

• Return value = offset_map_value

3. Read the 8-bit sensitivity value:

• Address = (offset_map_value/8) + sensitivity_base_address + frame_info_data_offset

• Return value = sensitive_bit_word[7:0]

4. Read the sensitive bit. The offset map value provides the sensitive bit index. A value of 1 indicates a

critical bit, and a value of 0 indicates a non-critical bit.

• Sensitive bit = sensitive_bit_word[bit_index]

where,

• bit_index = offset_map_value[2:0]

Performing a Lookup for SMH Revision 2

To perform a lookup into the sensitivity map header data using a bit, byte and frame number from an

EMR (Arria V, Cyclone V, Stratix V, and later devices only):

1. Read the 32-bit frame information string for the frame number:

• Address = 0x1C + (frame*4)

• Return value = (frame_info_data_offset, offset_map_array_index

2. Read the offset map information for a frame. The return value for the offset map information is 16 bits:

• Address = offset_map_base_address + offset array for current frame + offset data value for

current byte and bit

where,

• Offset array for current frame = offset_map_array_index * offset_map_length

• Offset data value for current byte and bit = [(byte * 8) + bit] * 2

• Return value = offset_map_value

3. Read the 8-bit sensitivity value:

• Address = (offset_map_value * sensitivity_data_tag_size /8) + sensitivity_base_address

+ frame_info_data_offset

• Return value = sensitive_bit_word[7:0]

4. Read sensitivity data tag. The offset map value provides the sensitive bit index. The return value for the

sensitivity tag is sensitivity_data_tag_size bit length. A zero tag indicates that bit is not critical for

any region while a non-zero tag indicates offset in region map.

• sensitive_tag = (sensitive_data word >> tag_shift) and tag_mask

where,

• tag_shift = (offset_map_value * sensitivity_data_tag_size)[2:0]

• tag_mask = (0x1 << sensitivity_data_tag_size) - 1;

5. Read the region mask for a non-zero sensitivity tag. The return value for the region mask is 16 bits.

• region_mask = region_map_base_address + (sensitivity_data_tag - 1) * 2

ALTADVSEU

2015.05.04

Performing a Lookup for SMH Revision 2

Altera Advanced SEU Detection IP Core User Guide

Altera Corporation

Send Feedback

1 2 ... 16 17 18 19 20 21 22

Commenti su questo manuale

Nessun commento

Altera Advanced SEU Detection IP Core Manuale Utente Pagina 21

Commenti su questo manuale

Prodotti e manuali riguardandi Strumenti di misura Altera Advanced SEU Detection IP Core