W9751G6IB-3 Winbond Electronics, W9751G6IB-3 Datasheet - Page 19

• Manufacturer Part Number: W9751G6IB-3
• Manufacturer: Winbond Electronics
• Type: DDR2 SDRAMr

Specifications of W9751G6IB-3

• Organization: 32Mx16
• Density: 512Mb
• Address Bus: 15b
• 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: 160mA
• 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.
t
ODT must remain LOW for the entire duration of t
AOFD
must be met before issuing the EMRS command.
Figure 11—ODT update delay timing - t
Old setting
t
AOFD
Figure 10—ODT update delay timing - t
EMRS
- 19 -
MOD
MOD
NOP
t
MOD,max
, as measured from outside
window, until t
Publication Release Date: Oct. 23, 2009
NOP
MOD
MOD
,max is met.
t
IS
W9751G6IB
NOP
t
AOND
Revision A06
NOP
New setting
NOP