W9751G6JB-3 Winbond, W9751G6JB-3 Datasheet - Page 19

• Manufacturer Part Number: W9751G6JB-3
• Manufacturer: Winbond
• Type: DDR2 SDRAMr

Specifications of W9751G6JB-3

• Organization: 32Mx16
• Density: 512Mb
• Address Bus: 14b
• Access Time (max): 450ps
• Maximum Clock Rate: 667MHz
• Operating Supply Voltage (typ): 1.8V
• Package Type: WBGA
• Operating Temp Range: 0C to 85C
• Operating Supply Voltage (max): 1.9V
• Operating Supply Voltage (min): 1.7V
• Supply Current: 150mA
• Pin Count: 84
• Mounting: Surface Mount
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Compliant

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: Jun. 18, 2010
NOP
NOP
MOD
MOD
,max is met.
W9751G6JB
t
IS
NOP
New setting
NOP
t
IS
t
AOND
Revision A03
NOP
NOP
New setting
NOP