AS4C256M16D3
Figure 46. WRITE(BC8) to WRITE(BC8)
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
NOP
NOP
NOP
COMMAND
tCCD
tWR
4 Clocks
tWTR
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
Din
b+4
Din
b+5
Din
b+6
Din
b+7
DQ
WL = 5
WL = 5
NOTES:
1. BL8, 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 either MR0[A1:0 = 00] or MR0[A1:0 = 01] and A12 = 1 during WRITE command at T0 and T4.
5. The write recovery time (tWR) and write timing parameter (tWTR) are referenced from the first rising clock edge after the last write data shown at T13.
TRANSITIONING DATA
Don't Care
Figure 47. WRITE(BC4) 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
COMMAND
tCCD
tWR
tWTR
Notes 4
Bank
Col n
Bank
Col b
ADDRESS
tWPRE
tWPST
tWPST
tWPRE
DQS, DQS#
Notes 2
Din
n
Din
n+1
Din
n+2
Din
n+3
Din
b
Din
b+1
Din
b+2
Din
b+3
DQ
WL = 5
WL = 5
NOTES:
1. BC4, 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. BC4 setting activated by MR0[A1:0 = 01] and A12 = 0 during WRITE command at T0 and T4.
5. The write recovery time (tWR) and write timing parameter (tWTR) are referenced from the first rising clock edge at T13 (4 clocks from T9).
TRANSITIONING DATA
Don't Care
Figure 48. WRITE(BC8) to READ(BC4,BC8) OTF
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
T13
T14
CK#
CK
Notes 3
WRITE
NOP
NOP
NOP
NOP
NOP
NOP
NOP
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
Din
n+4
Din
n+5
Din
n+6
Din
n+7
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. BL8 setting activated by either MR0[A1:0 = 00] or MR0[A1:0 = 01] and A12 = 1 during WRITE command at T0.
READ command at T13 can be either BC4 or BL8 depending on MR0[A1:0] and A12 status at T13.
TRANSITIONING DATA
Don't Care
Confidential
69
Rev. 3.0
Aug. /2014
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
