Datasheet

DON'T CARE
NOTE 1. BC = 4, RL = 11 (CL = 11, AL = 0), Read Preamble = 1t
CK
, WL = 9 (CWL = 9, AL = 0), Write Preamble = 1t
CK
NOTE 2. Dout n = data-out from column n, DIN b = data-in to column b.
NOTE 3. DES commands are shown for ease of illustration; other commands may be valid at these times.
NOTE 4. BC4(OTF) setting activated by MR0[A1:A0 = 0:1] and A12 = 0 during READ command at T0 and WRITE command at T6.
NOTE 5. CA Parity = Disable, CS to CA Latency = Disable, Read DBI = Disable, Write DBI = Disable, Write CRC = Disable.
T0 T1 T6 T7 T8 T9 T10 T11
T12
T13
TRANSITIONING DATA
t
RPRE
t
WPST
Dout
n
Dout
n+1
Dout
n+2
Din
b+3
WL = 9
CK#
CK
DQ
ADDR
CMD
T14
DESREAD WRITE DES READ DES DES DES DES DES DES
DES
Bank,
Col n
BG a
Bank Group
ADDR
DES
DQS, DQS#
T15 T16
RL = 11
BG a or
BG b
DES
DES
T17 T19
Bank,
Col b
Din
b
Din
b+1
Din
b+2
READ to WRITE Command Delay
= RL +BL/2 - WL + 2t
CK
Dout
n+3
t
RPST
t
WPRE
4 Clocks
DES
T20
t
WTR
t
WR
Figure 99. READ (BC4) OTF to WRITE (BC4) OTF with 1t
CK
Preamble in Same or Different Bank Group
DON'T CARE
NOTE 1. BC = 4, RL = 11 (CL = 11, AL = 0), Read Preamble = 2t
CK
, WL = 10 (CWL = 9+1*5, AL = 0), Write Preamble = 2t
CK
NOTE 2. Dout n = data-out from column n, DIN b = data-in to column b.
NOTE 3. DES commands are shown for ease of illustration; other commands may be valid at these times.
NOTE 4. BC4(OTF) setting activated by MR0[A1:A0 = 0:1] and A12 = 0 during READ command at T0 and WRITE command at T6.
NOTE 5. When operating in 2t
CK
Write Preamble Mode, CWL must be programmed to a value at least 1 clock greater than the lowest CWL setting.
NOTE 6. CA Parity = Disable, CS to CA Latency = Disable, Read DBI = Disable, Write DBI = Disable, Write CRC = Disable.
T0 T1 T6 T7 T8 T9 T10 T11
T12
T13
TRANSITIONING DATA
t
RPRE
t
WPST
Dout
n
Dout
n+1
Dout
n+2
Din
b+3
WL = 10
CK#
CK
DQ
ADDR
CMD
T14
DESREAD WRITE DES READ DES DES DES DES DES DES
DES
Bank,
Col n
BG a
Bank Group
ADDR
DES
DQS, DQS#
T15 T16
RL = 11
BG a or
BG b
DES
DES
T17 T18
Bank,
Col b
Din
b+1
Din
b+2
READ to WRITE Command Delay
= RL +BL/2 - WL + 3t
CK
DES
T19
t
WPRE
Dout
n+3
Din
b
DES
T20
t
RPST
4 Clocks
t
WTR
t
WR
Figure 100. READ (BC4) OTF to WRITE (BC4) OTF with 2t
CK
Preamble in Same or Different Bank Group
AS4C256M16D4
Confidential
- 99 of 201 -
Rev.1.0 Aug.2019