Intel i7-640M CN80617006936AA 사용자 설명서
제품 코드
CN80617006936AA
Datasheet
21
Interfaces
2.1.2
System Memory Timing Support
The IMC supports the following DDR3 Speed Bin, CAS Write Latency (CWL), and
command signal mode timings on the main memory interface:
• tCL = CAS Latency
• tRCD = Activate Command to READ or WRITE Command delay
• tRP = PRECHARGE Command Period
• CWL = CAS Write Latency
• Command Signal modes = 1n indicates a new command may be issued every clock
• tRCD = Activate Command to READ or WRITE Command delay
• tRP = PRECHARGE Command Period
• CWL = CAS Write Latency
• Command Signal modes = 1n indicates a new command may be issued every clock
and 2n indicates a new command may be issued every two clocks. Command
launch mode programming depends on the transfer rate and memory
configuration.
NOTES:
1.
1.
System memory timing support is based on availability and is subject to change.
2.1.3
System Memory Organization Modes
The IMC supports two memory organization modes, single-channel and dual-channel.
Depending upon how the SO-DIMM Modules are populated in each memory channel, a
number of different configurations can exist.
2.1.3.1
Single-Channel Mode
In this mode, all memory cycles are directed to a single-channel. Single-channel mode
is used when either Channel A or Channel B SO-DIMM connectors are populated in any
order, but not both.
2.1.3.2
Dual-Channel Mode - Intel® Flex Memory Technology Mode
The IMC supports Intel Flex Memory Technology Mode. This mode combines the
advantages of the Dual-Channel Symmetric (Interleaved) and Dual-Channel
Asymmetric Modes. Memory is divided into a symmetric and an asymmetric zone. The
symmetric zone starts at the lowest address in each channel and is contiguous until the
asymmetric zone begins, or until the top address of the channel with the smaller
capacity is reached. In this mode, the system runs with one zone of dual-channel mode
and one zone of single-channel mode, simultaneously, across the whole memory array.
Table 3.
DDR3 System Memory Timing Support
Transfer
Rate
(MT/s)
tCL
(tCK)
tRCD
(tCK)
tRP
(tCK)
CWL
(tCK)
CMD Mode
Notes
800
6
6
6
5
1n
1
1066
7
7
7
6
1n
1
8
8
8