Intel BX80623I32100 Datasheet download pdf (Page 21)

Datasheet, Volume 1 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:

•t

= CAS Latency

•t

RCD

= Activate Command to READ or WRITE Command delay

•t

= 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 2 clocks. Command launch

mode programming depends on the transfer rate and memory configuration.

Notes:

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 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 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. 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.

Note: Channels A and B can be mapped for physical channels 0 and 1 respectively or vice

versa; however, channel A size must be greater or equal to channel B size.

Table 2-3. DDR3 System Memory Timing Support

Segment

Transfer

Rate

(MT/s)

tCL

(tCK)

tRCD

(tCK)

tRP

(tCK)

CWL

(tCK) DPC

CMD

Mode

Notes

All Desktop

segments

1066

7776

1 1n/2n

22n

8886

1 1n/2n

22n

1333 9 9 9 7

1 1n/2n

22n

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 111 112

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Intel BX80623I32100 Datasheet Page 21

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