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Chapter 7 ECC Generation Module (SRAM_ECCV1)
MC9S12ZVM Family Reference Manual Rev. 1.3
Freescale Semiconductor
237
7.2.2.7
ECC Debug Command (ECCDCMD)
Figure 7-8. ECC Debug Command (ECCDCMD)
Table 7-8. ECCDCMD Field Description
7.3
Functional Description
The bus system allows 1, 2, 3 and 4 byte write access to a 4 byte aligned memory address, but the ECC
value is generated based on an aligned 2 byte data word. Depending on the access type, the access is
separated into different access cycles.
shows the different access types with the expected number
of access cycles and the performed internal operations.
Module Base + 0x000F
Access: User read/write
(1)
1. Read: Anytime
Write: Anytime, in special mode only
7
6
5
4
3
2
1
0
R
ECCDRR
0
0
0
0
0
ECCDW
ECCDR
W
Reset
0
0
0
0
0
0
0
0
Field
Description
7
ECCDRR
ECC Disable Read Repair Function— Writing one to this register bit will disable the automatic single bit ECC
error repair function during read access; see also chapter
0 Automatic single ECC error repair function is enabled
1 Automatic single ECC error repair function is disabled
1
ECCDW
ECC Debug Write Command — Writing one to this register bit will perform a debug write access, to the system
memory. During this access the debug data word (DDATA) and the debug ECC value (DECC) will be written to
the system memory address defined by DPTR. If the debug write access is done, this bit is cleared. Writing 0
has no effect. It is not possible to set this bit if the previous debug access is ongoing (ECCDW or ECCDR bit set).
0
ECCDR
ECC Debug Read Command — Writing one to this register bit will perform a debug read access from the
system memory address defined by DPTR. If the debug read access is done, this bit is cleared and the raw
memory read data are available in register DDATA and the raw ECC value is available in register DECC. Writing
0 has no effect. If the ECCDW and ECCDR bit are set at the same time, then only the ECCDW bit is set and the
Debug Write Command is performed. It is not possible to set this bit if the previous debug access is ongoing
(ECCDW or ECCDR bit set).
Table 7-9. Memory access cycles
Access type
ECC
error
access
cycle
Internal operation
Memory
content
Error indication
2 and 4 byte
aligned write
access
—
1
write to memory
new data
—
Содержание MC9S12ZVM series
Страница 116: ...Chapter 2 Port Integration Module S12ZVMPIMV1 MC9S12ZVM Family Reference Manual Rev 1 3 116 Freescale Semiconductor ...
Страница 242: ...Chapter 7 ECC Generation Module SRAM_ECCV1 MC9S12ZVM Family Reference Manual Rev 1 3 242 Freescale Semiconductor ...
Страница 384: ...Chapter 10 Supply Voltage Sensor BATSV3 MC9S12ZVM Family Reference Manual Rev 1 3 384 Freescale Semiconductor ...
Страница 484: ...Chapter 13 Programmable Trigger Unit PTUV2 MC9S12ZVM Family Reference Manual Rev 1 3 484 Freescale Semiconductor ...
Страница 662: ...Chapter 17 Gate Drive Unit GDUV4 MC9S12ZVM Family Reference Manual Rev 1 3 662 Freescale Semiconductor ...
Страница 684: ...Chapter 18 LIN Physical Layer S12LINPHYV2 MC9S12ZVM Family Reference Manual Rev 1 3 684 Freescale Semiconductor ...
Страница 740: ...Chapter 19 128 KB Flash Module S12ZFTMRZ128K512V2 MC9S12ZVM Family Reference Manual Rev 1 3 740 Freescale Semiconductor ...
Страница 756: ...Appendix A MCU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 756 Freescale Semiconductor ...
Страница 772: ...Appendix D LINPHY Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 772 Freescale Semiconductor ...
Страница 776: ...Appendix E GDU Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 776 Freescale Semiconductor ...
Страница 788: ...Appendix I MSCAN Electrical Specifications MC9S12ZVM Family Reference Manual Rev 1 3 788 Freescale Semiconductor ...
Страница 790: ...Appendix J Package Information MC9S12ZVM Family Reference Manual Rev 1 3 790 Freescale Semiconductor ...