49
Lockstep mode
•
In Lockstep Channel Mode, each memory access is a 128-bit data
access that spans Channel 1 and Channel 2. This is done to support
SDDC for DRAM devices with 8-bit wide data ports. The same
address is used on both channels such that an address error on any
channel is detectable by ECC. Lockstep Channel mode is the only
RAS mode that supports x8 SDDC.
•
Channel 3 has no function and cannot be populated in this mode.
•
Follow the population rules described in independent mode.
•
DIMM modules installed in channels 1 and 2 must be identical —
1A and 2A should be the same type, size and manufacturer.
1B and 2B memory should be the same type, size and
manufacturer. However, it is not necessary for slot A to have the
same memory module as slot B within a channel.
•
The same rule applies to processor 2.
Memory population for lockstep mode
Single processor configuration
Dual processor configuration
Notes: 1. Place DIMMs in “X” location.
2. DIMM population must correspond to the above tables.
3. DIMM modules support 1 GB, 2 GB, 4 GB and 8 GB
DIMMS.
4. The size of each DIMM must be the same across the
Single processor
Processor 1 P1DIMM slots
Channel 1
Channel 2
Channel 3
Configuration
1B
1A
2B
2A
3B
3A
A
X
X
NA
NA
B
X
X
X
X
NA
NA
Dual processors
Processor 1 P1DIMM slots
Processor 2 P2DIMM slots
Channel 1
Channel 2
Channel 3
Channel 1
Channel 2
Channel 3
Configuration
1B
1A
2B
2A
3B
3A
1B
1A
2B
2A
3B
3A
A
X
X
NA
NA
NA
NA
B
X
X
NA
NA
X
X
NA
NA
C
X
X
X
X
NA
NA
X
X
NA
NA
D
X
X
X
X
NA
NA
X
X
X
X
NA
NA
Summary of Contents for AW2000h-AW170h
Page 1: ...AW2000h Series User Guide AW170h F1 AW170hd F1 AW170hq F1 ...
Page 16: ...xvi ...
Page 17: ...1 System tour ...
Page 30: ...1 System tour 14 ...
Page 31: ...2 System setup ...
Page 38: ...2 System setup 22 ...
Page 39: ...3 System upgrades ...
Page 70: ...3 System upgrades 54 ...
Page 71: ...4 System BIOS ...
Page 99: ...5 System troubleshooting ...
Page 109: ...Appendix A Server management tools ...
Page 114: ...Appendix A Server management tools 98 ...
Page 115: ...Appendix B Rack mount configuration ...
Page 126: ...Appendix B Rack mount configuration 110 ...
Page 127: ...Appendix C Acer Smart Console ...
Page 156: ...Appendix C Acer Smart Console 140 ...
Page 160: ...150 ...