1GB-AUTO-AS4C128M8D3 Datasheet, PDF (81/84 Pages) Alliance Semiconductor Corporation – Fully synchronous operation

1Gb Auto-AS4C128M8D3
Figure 72. Asynchronous ODT Timings on DDR3 SDRAM with fast ODT transition
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
T13
T14
T15
T16
T17
CK#
CK
CKE
ODT
RTT
tIH
tIS
tAONPD(min)
tAONPD(max)
RTT
tIH
tIS
tAOFPD(min)
tAOFPD(max)
TRANSITIONING DATA
Don't Care
Figure 73. Synchronous to asynchronous transition during Precharge Power Down
(with DLL frozen) entry (AL = 0; CWL = 5; tANPD = WL - 1 = 4)
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
T13
Ta0
Ta1
Ta2
Ta3
CK#
CK
COMMAND
NOP
REF
NOP
NOP
NOP
NOP
NOP
NOP
NOP
CKE
Last sync.
ODT
RTT
Sync. or
async. ODT
RTT
First async.
ODT
RTT
RTT
tRFC (min)
tANPD
PD entry transition period
tCPDED(min)
tAOF(min)
ODTLoff
tAOF(max)
RTT
RTT
tAOFPD(max)
ODTLoff + tAOFPD(min)
tAOFPD(min)
ODTLoff + tAOFPD(max)
TIME BREAK
tAOFPD(min)
tAOFPD(max)
TRANSITIONING DATA
Don't Care
Figure 74. Synchronous to asynchronous transition after Refresh command
(AL = 0; CWL = 5; tANPD = WL - 1 = 4)
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
T13
Ta0
Ta1
CK#
CK
COMMAND
NOP
REF
NOP
NOP
NOP
NOP
NOP
NOP
NOP
Ta2
Ta3
CKE
Last sync.
ODT
RTT
Sync. or
async. ODT
RTT
First async.
ODT
RTT
RTT
tRFC (min)
tANPD
PD entry transition period
tCPDED(min)
tAOF(min)
ODTLoff
tAOF(max)
RTT
RTT
tAOFPD(max)
ODTLoff + tAOFPD(min)
tAOFPD(min)
ODTLoff + tAOFPD(max)
TIME BREAK
tAOFPD(min)
tAOFPD(max)
TRANSITIONING DATA
Don't Care
Confidential
-81-
Rev.1.0 May 2015