6402 datasheet(14/250 Pages) INTEL

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Introduction

Intel® 6400/6402 Advanced Memory Buffer Datasheet

1.3.1

FBD High-Speed Differential Point-to-Point Link (at 1.5 V)

Interfaces

The AMB supports one FBD Channel interface consisting of two bidirectional link

interfaces using high-speed differential point-to-point electrical signaling.

The southbound input link is 10 lanes wide and carries commands and write data from

the host memory controller or the first adjacent DIMM in the host direction. The

southbound output link forwards this same data to the next adjacent FBD.

The northbound input link is 13 to 14 lanes wide and carries read return data or status

information from the next FB DIMM in the chain back towards the host. The northbound

output link forwards this information back towards the host and multiplexes in any read

return data or status information that is generated internally.

1.3.2

DDR2 Channel

The DDR2 channel on the AMB supports direct connection to DDR2 SDRAMs. The DDR2

channel supports two ranks of eight banks with 16 row/column request, 64 data

signals, and eight check-bit signals. There are two copies of address and command

signals to support DIMM routing and electrical requirements. Four-transfer bursts are

driven on the data and check-bit lines at 800 MHz.

Propagation delays between read data/check-bit strobe lanes on a given channel can

differ. Each strobe can be calibrated by hardware state machines using write/read trial

and error. Hardware aligns the read data and check-bits to a single core clock.

The AMB provides four copies of the command clock phase references (CLK[3:0]) and

write data/check-bit strobes (DQSs) for each DRAM nibble.

1.3.3

SMBus Slave Interface

The AMB supports an SMBus interface to allow system access to configuration registers

independent of the FBD link. The AMB will never be a master on the SMBus, only a

slave. Serial SMBus data transfer is supported at 100 kHz.

Figure 1-2. AMB Interfaces

AMB

MEMORYINTERFACE

SMB

NBFBD

InLink

NBFBD

Out Link

SBFBD

Out Link

SBFBD

InLink

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