Data Sheet
Datasheet, Volume 1 of 2 23
Interfaces
2.1.3 System Memory Organization Modes
The IMC supports two memory organization modes, single-channel and dual-channel.
Depending upon how the DDR Schema and DIMM Modules are populated in each
memory channel, a number of different configurations can exist.
Single-Channel Mode
In this mode, all memory cycles are directed to a single channel. Single-Channel mode
is used when either the Channel A or Channel B DIMM connectors are populated in any
order, but not both.
Dual-Channel Mode – Intel
®
Flex Memory Technology Mode
The IMC supports Intel Flex Memory Technology Mode. Memory is divided into a
symmetric and 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 channel 0 and 1 respectively or vice
versa. However, channel A size should be greater or equal to channel B size.
DDR4 2666 19 19 19
9/10/11/
12/14/16/
18
1 or 2 2N
Table 2-9. DRAM System Memory Timing Support (LPDDR3)
DRAM
Device
Transfer
Rate (MT/s)
tCL (tCK) tRCD (tCK)
tRPpb
1
(tCK)
tRPab
2
(tCK)
CWL (tCK)
LPDDR3 1866 14 17 17 20 11
LPDDR3 2133 16 20 20 23 13
Notes:
1. tRPpb = Row Precharge typical time (single bank).
2. tRPab = Row Precharge typical time (all banks).
Table 2-8. DRAM System Memory Timing Support (Sheet 2 of 2)
DRAM
Device
Transfer
Rate (MT/s)
tCL (tCK)
tRCD
(tCK)
tRP (tCK) CWL (tCK)
DPC
(SODIMM
Only)
CMD
Mode