參數(shù)資料
型號(hào): EDE5104ABSE-5C-E
廠商: ELPIDA MEMORY INC
元件分類: DRAM
英文描述: 512M bits DDR2 SDRAM
中文描述: 128M X 4 DDR DRAM, 0.5 ns, PBGA64
封裝: ROHS COMPLIANT, FBGA-64
文件頁(yè)數(shù): 33/66頁(yè)
文件大?。?/td> 697K
代理商: EDE5104ABSE-5C-E
EDE5104ABSE, EDE5108ABSE, EDE5116ABSE
Data Sheet E0323E90 (Ver. 9.0)
33
ODT(On Die Termination)
On Die Termination (ODT), is a feature that allows a DRAM to turn on/off termination resistance for each DQ, DQS,
/DQS, RDQS, /RDQS, and DM signal for
×
4
×
8 configurations via the ODT control pin. For
×
16 configuration ODT
is applied to each DQ, UDQS, /UDQS, LDQS, /LDQS, UDM, and LDM signal via the ODT control pin. The ODT
feature is designed to improve signal integrity of the memory channel by allowing the DRAM controller to
independently turn on/off termination resistance for any or all DRAM devices.
The ODT function is turned off and not supported in self-refresh mode.
Switch sw1 or sw2 is enabled by ODT pin.
Selection between sw1 or sw2 is determined by Rtt (nominal) in EMRS
Termination included on all DQs, DM, DQS, /DQS, RDQS and /RDQS pins.
Target Rtt (
) = (Rval1) / 2 or (Rval2) / 2
DRAM
input
buffer
VDDQ
VSSQ
sw1
sw1
sw2
Rval1
Rval1
Input
Pin
VDDQ
VSSQ
sw2
Rval2
Rval2
Functional Representation of ODT
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