AS4C256M16D3
Figure 43. WRITE(BC4) to READ (BC4) operation
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
Tn
CK#
CK
Notes 3
WRITE
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
Notes 5
READ
COMMAND
tWTR
Notes 4
Bank,
Col n
ADDRESS
tWPST
tWPRE
DQS, DQS#
Notes 2
Din
n
Din
n+1
Din
n+2
Din
n+3
DQ
RL = 5
WL = 5
NOTES:
1. BC4, WL = 5, RL = 5.
2. DIN n = data-in from column n.
3. NOP commands are shown for ease of illustration; other commands may be valid at these times.
4. BC4 setting activated by MR0[A1:0 = 10] during WRITE command at T0 and READ command at Tn.
5. tWTR controls the write to read delay to the same device and starts with the first rising clock edge after the last write data shown at T7.
TRANSITIONING DATA
Don't Care
TIME BREAK
,
Figure 44. WRITE(BC4) to Precharge Operation
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
Tn
CK#
CK
Notes 3
WRITE
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
Notes 5
PRE
COMMAND
tWR
Notes 4
Bank,
Col n
ADDRESS
tWPST
tWPRE
DQS, DQS#
Notes 2
Din
n
Din
n+1
Din
n+2
Din
n+3
DQ
WL = 5
NOTES:
1. BC4, WL = 5, RL = 5.
2. DIN n = data-in from column n.
3. NOP commands are shown for ease of illustration; other commands may be valid at these times.
4. BC4 setting activated by MR0[A1:0 = 10] during WRITE command at T0.
5. The write recovery time (tWR) referenced from the first rising clock edge after the last write data shown at T7.
tWR specifies the last burst write cycle until the precharge command can be issued to the same bank .
TRANSITIONING DATA
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TIME BREAK
Figure 45. WRITE(BC4) OTF to Precharge operation
CK#
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
Ta0
Ta1
Ta2
CK
Notes 3
WRITE
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
PRE
NOP
NOP
COMMAND
Notes 5
4 Clocks
tWR
Notes 4
Bank
Col n
ADDRESS
VALID
tWPST
tWPRE
DQS, DQS#
Notes 2
Din
n
Din
n+1
Din
n+2
Din
n+3
DQ
WL = 5
NOTES:
1. BC4 OTF, WL = 5 (CWL = 5, AL = 0)
2. DIN n (or b) = data-in from column n.
3. NOP commands are shown for ease of illustration; other commands may be valid at these times.
4. BC4 OTF setting activated by MR0[A1:0 = 01] and A12 = 0 during WRITE command at T0.
5. The write recovery time (tWR) starts at the rising clock edge T9 (4 clocks from T5).
TIME BREAK
TRANSITIONING DATA
Don't Care
Confidential
68
Rev. 3.0
Aug. /2014
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
