W9751G6JB-25 Winbond Electronics, W9751G6JB-25 Datasheet - Page 19

• Manufacturer Part Number: W9751G6JB-25
• Description: IC DDR2-800 SDRAM 512MB 84WBGA
• Manufacturer: Winbond Electronics

Specifications of W9751G6JB-25

• Format - Memory: RAM
• Memory Type: DDR2 SDRAM
• Memory Size: 512M (32Mx16)
• Speed: 2.5ns
• Interface: Parallel
• Voltage - Supply: 1.7 V ~ 1.9 V
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 84-WBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q5606783

However, to prevent any impedance glitch on the channel, the following conditions must be met.
Now the ODT is ready for normal operation with the new setting, and the ODT signal may be raised
again to turned on the ODT. Following timing diagram shows the proper Rtt update procedure.
CMD
ODT
CLK
CLK
Rtt
1) EMRS command directed to EMR(1), which updates the information in EMR(1)[A6,A2], i.e. Rtt (Nominal).
2)“setting＂in this diagram is what is measured from outside.
CMD
ODT
CLK
CLK
Rtt
t
ODT must remain LOW for the entire duration of t
1) EMRS command directed to EMR(1), which updates the information in EMR(1)[A6,A2], i.e. Rtt (Nominal).
2) “setting” in this diagram is the Register and I/O setting, not what is measured from outside.
AOFD
must be met before issuing the EMRS command.
Figure 11 – ODT update delay timing - t
Old setting
t
AOFD
Old setting
t
AOFD
EMRS
Figure 10 – ODT update delay timing - t
t
MOD,min
NOP
EMRS
t
MOD,max
- 19 -
Updating
MOD
NOP
MOD
NOP
t
MOD,max
, as measured from outside
window, until t
Publication Release Date: Aug. 03, 2010
NOP
NOP
MOD
MOD
,max is met.
W9751G6JB
t
IS
NOP
New setting
NOP
t
IS
t
AOND
Revision A04
NOP
NOP
New setting
NOP