Motorola MVME2300 Series - Manual (Page 219)

Software Considerations
http://www.motorola.com/computer/literature 3-57
3
ECC Codes
When the Falcon reports a single-bit error, software can use the syndrome
that was logged by the Falcon (upper or lower depending where the error
occurred) to determine which bit was in error.
Table 3-20 shows the
syndrome for each possible single bit error. Table 3-21 shows the same
information ordered by syndrome. In order to relate this information to
PowerPC addresses and bit numbers, the user needs to understand how the
Falcon pair positions PowerPC data in DRAM. See the section on
Data
Paths for an explanation of this.
Note that these tables are the same whether the Falcon is configured as
upper or as lower device.
1024MB
ROW A3 A5 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17
COL A2 A4 A6 A18 A19 A20 A21 A22 A23 A24 A25 A26 A27
Table 3-20. Syndrome Codes Ordered by Bit in Error
Bit Syndrome Bit Syndrome Bit Syndrome Bit Syndrome Bit Syndrome
rd0 $4A rd16 $92 rd32 $A4 rd48 $29 ckd0 $01
rd1 $4C rd17 $13 rd33 $C4 rd49 $31 ckd1 $02
rd2 $2C rd18 $0B rd34 $C2 rd50 $B0 ckd2 $04
rd3 $2A rd19 $8A rd35 $A2 rd51 $A8 ckd3 $08
rd4 $E9 rd20 $7A rd36 $9E rd52 $A7 ckd4 $10
rd5 $1C rd21 $07 rd37 $C1 rd53 $70 ckd5 $20
rd6 $1A rd22 $86 rd38 $A1 rd54 $68 ckd6 $40
rd7 $19 rd23 $46 rd39 $91 rd55 $64 ckd7 $80
Table 3-19. PowerPC 60 x Address to DRAM Address Mappings
RA ---->
Block Size
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V 0 1 2 3 4 5 6 7 8 9 10 11 12