KC82870DH S L5X2 Intel, KC82870DH S L5X2 Datasheet - Page 30

• Manufacturer Part Number: KC82870DH S L5X2
• Manufacturer: Intel

Specifications of KC82870DH S L5X2

• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

Functional Description
4.2
4-2
Figure 4-1. DMH Block Diagram
Main Channel to Branch Channel Translation
The Main Channel consists of unidirectional high speed RSL control signals, and bi-directional
high speed RSL data signals. The control signals are referred to as the Request Control (RQ) bus,
and the data signals are referred to as the DQA/DQB bus. The RQ bus carries the MCP from the
SNC to the DMH.
The SNC tunnels DDR DIMM commands and data over the Main Channel, and the DMH
deterministically moves them onto the Branch Channels. The command path is one-way, with no
command feedback from the DDR side. The datapath is bi-directional.
The SNC must track and emit periodic DIMM refresh cycles, short RAC current calibration cycles
and RAC temperature calibration cycles. The DMH does not provide autonomous periodic
calibration event handling, but instead deterministically forwards each periodic MCP command
received from the SNC. The DMH embeds a Branch Channel short slew-rate calibration within its
temperature calibration command. The DMH also embeds a DQS delay line calibration within its
Main Channel short current calibration command. Therefore, there are no separate commands for
Branch Channel short slew-rate calibration or DQS delay line calibration.
Page Open policy is somewhat constrained by the DMH write FIFO logic (refer to
“Memory Translation
not track pages.
PWRGOOD
CFM/CFMN
CTM/CTMN
DQA,DQB
RESET#
CMD
SCK
SIO
RQ
Rules”). Managing of the open pages is done by the SNC and the DMH does
Channel
MSIO
RAC
Main
Bus
MCP Decode
and SDRAM
Conf iguration
Read Data
Packetizer
Command
Generator
Data Write
and Clock
Crossing
Registers
Buf f ers
Intel
Logic
DMH
®
E8870DH DDR Memory Hub (DMH) Datasheet
BSIO
Bus
Section 4.8,
SCLK, SCLK#
DQS
A,BA
RAS,CAS,WE
CS,CKE
DQ
SCLK, SCLK#
RAS,CAS,WE
DQS
SDA
A,BA
CS,CKE
DQ
SCL
001179a