MT41J256M8DA-125:H Micron Technology Inc, MT41J256M8DA-125:H Datasheet - Page 203

• Manufacturer Part Number: MT41J256M8DA-125:H
• Manufacturer: Micron Technology Inc

Specifications of MT41J256M8DA-125:H

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Synchronous to Asynchronous ODT Mode Transition (Power-Down Entry)
PDF: 09005aef826aaadc
2Gb_DDR3_SDRAM.pdf – Rev. K 04/10 EN
There is a transition period around power-down entry (PDE) where the DRAM’s ODT
may exhibit either synchronous or asynchronous behavior. This transition period oc-
curs if the DLL is selected to be off when in precharge power-down mode by the setting
MR0[12] = 0. Power-down entry begins
and it ends when CKE is first registered LOW.
+ 1
gress when CKE goes LOW, power-down entry will end
mand rather than when CKE is first registered LOW. Power-down entry will then
become the greater of
ODT assertion during power-down entry results in an R
of
(MAX) and ODTL on ×
may result in an R
t
Table 90 (page 204) summarizes these parameters.
If the AL has a large value, the uncertainty of the state of R
is because ODTL on and ODTL off are derived from the WL and WL is equal to CWL +
AL. Figure 118 (page 204) shows three different cases:
• ODT_A: Synchronous behavior before
• ODT_B: ODT state changes during the transition period with
• ODT_C: ODT state changes after the transition period with asynchronous behavior
AOF (MIN) or as late as the greater of
ODTL on ×
(MAX)
t
t
AONPD (MIN) and ODTL on ×
CK or ODTL on + 1
t
CK +
TT
t
AON (MIN) and
change as early as the lesser of
t
t
t
CK. If a REFRESH command has been issued, and it is in pro-
ANPD and
CK +
t
203
AON (MAX). ODT deassertion during power-down entry
t
t
CK +
RFC - REFRESH command to CKE registered LOW.
t
AONPD (MAX) greater than ODTL on ×
t
AOFPD (MAX) and ODTL off ×
Micron Technology, Inc. reserves the right to change products or specifications without notice.
t
t
ANPD prior to CKE first being registered LOW,
AON (MIN) or as late as the greater of
t
ANPD
t
ANPD is equal to the greater of ODTL off
2Gb: x4, x8, x16 DDR3 SDRAM
t
AOFPD (MIN) and ODTL off ×
t
TT
RFC after the REFRESH com-
TT
change as early as the lesser
becomes quite large. This
© 2006 Micron Technology, Inc. All rights reserved.
t
AONPD (MIN) less than
t
CK +
t
AOF (MAX).
t
CK +
t
AONPD
t
t
AON
CK +