EDJ1108BABG, EDJ1116BABG
Mode Register Settings for Dynamic ODT Mode:
The table Mode Register for RTT Selection shows the Mode Register bits to select RTT_Nom and RTT_WR values.
[Mode Register for RTT Selection]
MR1
MR2
RTT_Nom
(RZQ)
RTT_Nom
RTT_WR
(RZQ)
Dynamic ODT OFF: Write does not
affect RTT value
RTT_WR*1
A9
0
A6
0
A2
0
(Ω)
A10
0
A9
0
(Ω)
off
off
0
0
0
1
1
1
1
0
1
1
0
0
1
1
1
0
1
0
1
0
1
RZQ/4
60
0
1
1
1
0
1
RZQ/4
60
RZQ/2
120
RZQ/2
120
RZQ/6
40
Reserved
Reserved
RZQ/12*2
RZQ/8*2
Reserved
Reserved
20
30
Reserved
Reserved
Notes: 1. RZQ = 240Ω.
2. If RTT_Nom is used during WRITEs, only the values RZQ/2, RZQ/4 and RZQ/6 are allowed.
ODT Timing Diagrams
T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19
CK
/CK
ODTLcnw
WRS4
Command
ODTH4
ODTH4
ODT
RTT
ODTLon
ODTLoff
tADC (min.)
RTT_Nom
tADC (max.)
tAON (min.)
RTT_Nom
tADC (min.)
RTT_WR
tAOF (min.)
tAOF (max.)
tAON (max.)
tADC (max.)
ODTLcwn4
DQS, /DQS
DQ
in in in in
0
1
2
3
WL
Dynamic ODT: Behavior with ODT Being Asserted Before and after the Write*
Note: Example for BC4 (via MRS or OTF), AL = 0, CWL = 5. ODTH4 applies to first registering ODT high and to the
registration of the write command. In this example ODTH4 would be satisfied if ODT is low at T8 (4 clocks
after the write command).
Data Sheet E1248E40 (Ver. 4.0)
135
ELPIDA [ ELPIDA MEMORY ]
