AS4C256M16D3
Figure 35. READ (BL4) to READ (BL8) OTF
CK#
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
T13
T14
CK
Notes 3
READ
NOP
NOP
NOP
READ
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
COMMAND
tCCD
Notes 4
Bank,
Col n
Bank,
Col b
ADDRESS
tRPST
tRPST
tRPRE
tRPRE
DQS, DQS#
Notes 2
Dout
n
Dout
n+1
Dout
n+2
Dout
n+3
Dout
b
Dout
b+1
Dout
b+2
Dout
b+3
Dout
b+4
Dout
b+5
Dout
b+6
Dout
b+7
DQ
RL = 5
RL = 5
NOTES:
1. RL = 5 (CL = 5, AL = 0)
2. DOUT n (or b) = data-out 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 READ command at T0.
BL8 setting activated by MR0[A1:0 = 01] and A12 = 1 during READ command at T4.
TRANSITIONING DATA
Don't Care
Figure 36. READ (BC4) to WRITE (BL8) OTF
CK#
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
T13
T14
T15
CK
Notes 3
READ
NOP
NOP
NOP
WRITE
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
COMMAND
tWR
tWTR
READ to WRITE Command Delay = RL + tCCD/2 + 2tCK - WL
4 clocks
Notes 4
Bank,
Bank,
Col b
ADDRESS
Col n
tWPST
tWPRE
tRPST
tRPRE
DQS, DQS#
Notes 2
Dout
n
Dout
n+1
Dout
n+2
Dout
n+3
Din
b
Din
b+1
Din
b+2
Din
b+3
Din
b+4
Din
b+5
Din
b+6
Din
b+7
DQ
RL = 5
WL = 5
NOTES:
1. BC4, RL = 5 (CL = 5, AL = 0), WL = 5 (CWL = 5, AL = 0)
2. DOUT n = data-out from column, DIN b = data-in 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 READ command at T0 and WRITE command at T4.
TRANSITIONING DATA
Don't Care
Figure 37. READ (BL8) to WRITE (BL4) OTF
CK#
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
T13
T14
T15
CK
Notes 3
READ
NOP
NOP
NOP
NOP
NOP
WRITE
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
COMMAND
tWR
tWTR
READ to WRITE Command Delay = RL + tCCD + 2tCK - WL
4 clocks
Notes 4
Bank,
Col n
Bank,
Col b
ADDRESS
tWPST
tRPST
tWPRE
tRPRE
DQS, DQS#
Notes 2
Dout
n
Dout
n+1
Dout
n+2
Dout
n+3
Dout
n+4
Dout
n+5
Dout
n+6
Dout
n+7
Din
b
Din
b+1
Din
b+2
Din
b+3
DQ
RL = 5
WL = 5
NOTES:
1. RL = 5 (CL = 5, AL = 0), WL = 5 (CWL= 5, AL = 0)
2. DOUT n = data-out from column, DIN b = data-in 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 MR0[A1:0 = 01] and A12 = 1 during READ command at T0.
BC4 setting activated by MR0[A1:0 = 01] and A12 = 0 during WRITE command at T6.
TRANSITIONING DATA
Don't Care
Confidential
64
Rev. 3.0
Aug. /2014
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
