AS4C256M16D3
Figure 49. WRITE(BC4) to READ(BC4,BC8) OTF
CK#
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
T13
T14
CK
Notes 3
WRITE
NOP
NOP
NOP
NOP
NOP
NOP
NOP
4 Clocks
NOP
NOP
NOP
NOP
NOP
READ
NOP
COMMAND
tWTR
Notes 4
Bank
Col n
Bank
Col b
ADDRESS
tWPST
tWPRE
DQS, DQS#
Notes 2
RL = 5
Din
n
Din
n+1
Din
n+2
Din
n+3
DQ
WL = 5
NOTES:
1. RL = 5 (CL = 5, AL = 0), WL = 5 (CWL =5, AL = 0)
2. DIN n = data-in from column n; DOUT b = data-out from column b.
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 = 01] and A12 = 0 during WRITE command at T0.
READ command at T13 can be either BC4 or BL8 depending on A12 status at T13.
TRANSITIONING DATA
Don't Care
Figure 50. WRITE(BC4) to READ(BC4)
CK#
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
T13
T14
CK
Notes 3
WRITE
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
READ
NOP
NOP
NOP
COMMAND
tWTR
Notes 4
Bank
Col n
Bank
Col b
ADDRESS
tWPST
tWPRE
DQS, DQS#
Notes 2
RL = 5
Din
n
Din
n+1
Din
n+2
Din
n+3
DQ
WL = 5
NOTES:
1. RL = 5 (CL = 5, AL = 0), WL = 5 (CWL =5, AL = 0)
2. DIN n = data-in from column n; DOUT b = data-out from column b.
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].
TRANSITIONING DATA
Don't Care
Figure 51. WRITE(BC8) to WRITE(BC4) OTF
CK#
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
T13
T14
CK
Notes 3
WRITE
NOP
NOP
NOP
WRITE
NOP
NOP
NOP
NOP
NOP
NOP
NOP
4 Clocks
NOP
NOP
NOP
tWR
tWTR
COMMAND
tCCD
Notes 4
Bank
Col n
Bank
Col b
ADDRESS
tWPST
tWPRE
DQS, DQS#
Notes 2
Din
n
Din
n+1
Din
n+2
Din
n+3
Din
n+4
Din
n+5
Din
n+6
Din
n+7
Din
b
Din
b+1
Din
b+2
Din
b+3
DQ
WL = 5
WL = 5
NOTES:
1. WL = 5 (CWL = 5, AL = 0)
2. DIN n (or b) = data-in from column n (or column b).
3. NOP commands are shown for ease of illustration; other commands may be valid at these times.
4. BL8 setting activated by MR0[A1:0 = 01] and A12 = 1 during WRITE command at T0.
BC4 setting activated by MR0[A1:0 = 01] and A12 = 0 during WRITE command at T4.
TRANSITIONING DATA
Don't Care
Confidential
70
Rev. 3.0
Aug. /2014
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
