Glossary
A Glossary
A.1
Terms and Definitions
Term
Definition
ADC
Analog to Digital Converter
Advanced Memory Buffer
Autonomous Platform Manager
Automatic Test Equipment
Built-In Self-Test
AMB
APM
ATE
BIST
BL4/BL8
CAS
DRAM Burst Length 4/8
Column Address Strobe
Chip Boot Configuration
CBC
Chip disable
An ECC encoding specifically tailored for memory such that the data from any
defective memory device can be reconstructed from some aggregate of
surviving memory devices. Corrects data from failed device. The AMB employs
an “x8” ECC, which means that all data from a partially or completely failed 8-bit
device can be recovered without stopping the system. This same ECC provides
the same level of coverage for 4-bit (“x4”) devices.
CRC
Cyclic Redundancy Code(s). Usually in reference to binary error detection
algorithms.
CSR
Configuration and Status Register(s)
Double Data Rate (SDRAM)
DDR
DDR Branch
The minimum aggregation of DDR channels which operate in lock-step to
support error correction. Two channels per branch supports x8 chip disable ECC.
A rank spans a branch.
DDR Channel
A DDR channel consists of a data channel with 72 bits of data and an ADDR/
CNTRL channel
DDR Data channel
A DDR data channel consists of 72 bits of data, divided into 18 data groups
Each data group consists of 4 data signals and a differential strobe pair
Design for Test/Manufacturability/Validation
DDR Data group
DFx
DFV
Design For Validation
DIMM
Dual In-Line Memory Module. A packaging arrangement of memory devices on a
socketable substrate.
DIMM Slot
Receptacle (socket) for a DIMM. Also, the relative physical location of a specific
DIMM on a DDR channel.
DIMM Stack
Dual-ranked x4 DRAM DIMM physical topology: refers to two physical rows of
DRAM “stacked” one above another
DLL
Delay locked loop
DPM
Defects per million
DRAM
Dynamic Random Access Memory
The DRAM cells selected by the Row Address
Error Correction Code. For the AMB, this is a chip disable code.
Electrically Erasable Programmable Read Only Memory
Error Mask
DRAM Page (Row)
ECC
EEPROM
EMask, EMASK
Intel® 6400/6402 Advanced Memory Buffer Datasheet
247
INTEL [ INTEL ]
