Datasheet
DON'T CARE
NOTE 1. BL = 8, 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. BL8 setting activated by either MR0[A1:A0 = 0:0] or MR0[A1:A0 = 0:1] and A12 = 1 during READ command at T0 and WRITE command at T8.
NOTE 5. CA Parity = Disable, CS to CA Latency = Disable, Read DBI = Disable, Write DBI = Disable, Write CRC = Disable.
T0 T1 T8 T10 T11 T12 T13 T14
T15
T16
TRANSITIONING DATA
t
RPRE
t
WPST
Dout
n
Dout
n+1
Dout
n+2
Dout
n+3
Dout
n+4
Dout
n+5
Dout
n+6
Din
b+7
WL = 9
CK#
CK
DQ
ADDR
CMD
T17
DESREAD WRITE READ DES DES DES DES DES DES DES
DES
Bank,
Col n
BG a
DES
T18 T19
RL = 11
BG a or
BG b
DES
DES
T20 T21
Bank,
Col b
Din
b
Din
b+1
Din
b+2
Din
b+3
Din
b+4
Din
b+5
Din
b+6
READ to WRITE Command Delay
= RL +BL/2 - WL + 2t
CK
Dout
n+7
t
RPST
t
WPRE
4 Clocks
DES
T22
t
WTR
t
WR
Bank Group
ADDR
DQS, DQS#
Figure 97. READ (BL8) to WRITE (BL8) with 1t
CK
Preamble in Same or Different Bank Group
DON'T CARE
NOTE 1. BL = 8, 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. BL8 setting activated by either MR0[A1:A0 = 0:0] or MR0[A1:A0 = 0:1] and A12 = 1 during READ command at T0 and WRITE command at T8.
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 T8 T9 T10 T11 T12 T13
T14
T15
TRANSITIONING DATA
t
RPRE
t
WPST
Dout
n
Dout
n+1
Dout
n+2
Dout
n+3
Dout
n+4
Dout
n+5
Dout
n+6
Din
b+7
WL = 10
CK#
CK
DQ
ADDR
CMD
T16
DESREAD WRITE DES READ DES DES DES DES DES DES
DES
Bank,
Col n
BG a
Bank Group
ADDR
DES
DQS, DQS#
T17 T18
RL = 11
BG a or
BG b
DES
DES
T19 T20
Bank,
Col b
Din
b+1
Din
b+2
Din
b+3
Din
b+4
Din
b+5
Din
b+6
READ to WRITE Command Delay
= RL +BL/2 - WL + 3t
CK
DES
T21
t
WPRE
Dout
n+7
Din
b
DES
T22
t
RPST
4 Clocks
t
WTR
t
WR
Figure 98. READ (BL8) to WRITE (BL8) with 2t
CK
Preamble in Same or Different Bank Group
AS4C256M16D4
Confidential
- 98 of 201 -
Rev.1.0 Aug.2019