IS43TR16640A-125KBL View Datasheet(PDF) - Unspecified
Part Name
Description
Manufacturer
IS43TR16640A-125KBL Datasheet PDF : 71 Pages
| |||
IS43TR16640A, IS43TR81280A
CK#
CK
Command
Valid
Address Valid
Valid
Valid
Valid
Valid
MRS
Valid
NOP/
DEC
Valid
NOP/
DEC
Valid
CKE
Settings
Old Settings
RTT_Nom ENABLED prior and/or after MRS command
ODT
Valid
Valid
ODTLoff + 1
RTT_Nom DISABLED prior and after MRS command
ODT
Valid
Valid
Valid
Valid
Valid
tMRD
Valid
MRS
Valid
Valid
Figure2.3.1a tMRD Timing
NOP/
DEC
Valid
NOP/
DEC
Valid
Valid
Valid
Valid
Valid
tMRD
New Settings
Valid
Valid
Valid
Valid
( ( Time
) ) Break
Valid
DON’T
CARE
The MRS command to Non-MRS command delay, tMOD, is require for the DRAM to update the features except DLL
reset, and is the minimum time required from an MRS command to a non-MRS command excluding NOP and DES shown
as the following figure.
CK#
CK
Command
Valid
Address Valid
Valid
Valid
Valid
Valid
MRS
Valid
NOP/
DEC
Valid
NOP/
DEC
Valid
NOP/
DEC
Valid
NOP/
DEC
Valid
NOP/
DEC
Valid
Valid
Valid
Valid
Valid
CKE
Settings
Old Settings
RTT_Nom ENABLED prior and/or after MRS command
ODT
Valid
Valid
ODTLoff + 1
RTT_Nom DISABLED prior and after MRS command
ODT
Valid
Valid
Valid
Valid
Valid
tMOD
Valid
Valid
Valid
Figure 2.3.1b tMOD Timing
New Settings
Valid
Valid
( ( Time
) ) Break
Valid
Valid
DON’T
CARE
The mode register contents can be changed using the same command and timing requirements during normal operation
as long as the DRAM is in idle state, i.e., all banks are in the precharged state with tRP satisfied, all data bursts are
completed and CKE is high prior to writing into the mode register. If the RTT_NOM Feature is enabled in the Mode
Register prior and/or after an MRS Command, the ODT Signal must continuously be registered LOW ensuring RTT is in
an off State prior to the MRS command. The ODT Signal maybe registered high after tMOD has expired. If the RTT_NOM
Feature is disabled in the Mode Register prior and after an MRS command, the ODT Signal can be registered either LOW
or HIGH before, during and after the MRS command. The mode registers are divided into various fields depending on the
functionality and/or modes.
Integrated Silicon Solution, Inc. – www.issi.com –
9
Rev. 00A
04/16/2012
Share Link: 