Datasheet

Read to Write with Write CRC
DON'T CARE
NOTE 1. BL = 8 ( or BC = 4 : OTF for Write), RL = 11 (CL = 11, AL = 0), Read Preamble = 1tCK, 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. BC4 setting activated by MR0[A1:0 = 01] and A12 = 0 during Write command at T8.
NOTE 6. CA Parity = Disable, CS to CA Latency = Disable, Read DBI = Disable, Write DBI = Disable, Write CRC = Enable.
T0 T1 T8 T9 T11 T12 T13 T14
T15
T16
TRANSITIONING DATA
CK#
CK
DQ
CMD
T17
DESREAD WRITE DES DES DES DES DES DES DES DES
DES
ADDR
DES
T18 T19
DES
DES
T20 T21
DES
T22
DQ
RL = 11
Bank
Col b
Bank
Col n
BG a or
BG b
BG a
Bank Group
ADDR
DQS, DQS#
READ to WRITE Command Delay
= RL +BL/2 - WL + 2t
CK
t
WR
4 Clocks
t
WTR
BL = 8
Read : BL = 8, Write : BC = 4 (OTF)
Dout
n
Dout
n+1
Dout
n+2
Dout
n+7
Dout
n+3
Dout
n+4
Dout
n+5
Dout
n+6
Din
b
Din
b+1
Din
b+2
CRC
Din
b+3
Din
b+4
Din
b+5
Din
b+6
Din
b+7
Dout
n
Dout
n+1
Dout
n+2
Dout
n+7
Dout
n+3
Dout
n+4
Dout
n+5
Dout
n+6
Din
b
Din
b+1
Din
b+2
Din
b+3
t
RPRE
t
WPST
t
RPST
t
WPRE
WL = 9
CRC
Figure 119. READ (BL8) to WRITE (BL8 or BC4: OTF) with 1t
CK
Preamble and Write CRC in Same or
Different Bank Group
DON'T CARE
NOTE 1. BC = 4 (Fixed), 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 setting activated by MR0[A1:A0 = 1:0].
NOTE 5. CA Parity = Disable, CS to CA Latency = Disable, Read DBI = Disable, Write DBI = Disable, Write CRC = Enable.
T0 T1 T6 T8 T9 T10 T11 T12
T13
T14
TRANSITIONING DATA
CK#
CK
CMD
T15
DESREAD WRITE DES DES DES DES DES DES DES DES
DES
ADDR
DES
T16 T17
DES
DES
T18 T19
DES
T20
DQ
RL = 11
Bank
Col b
Bank
Col n
BG a or
BG b
BG a
Bank Group
ADDR
DQS, DQS#
READ to WRITE Command Delay
= RL +BL/2 - WL + 2t
CK
t
WR
2 Clocks
t
WTR
BC=4 (Fixed)
Dout
n
Dout
n+1
Dout
n+3
Dout
n+2
Din
b
Din
b+1
Din
b+2
Din
b+3
t
RPRE
t
WPST
t
RPST
t
WPRE
WL = 9
CRC
Figure 120. READ (BC4:Fixed) to WRITE (BC4: Fixed) with 1t
CK
Preamble and Write CRC in Same or
Different Bank Group
AS4C256M16D4
Confidential
- 109 of 201 -
Rev.1.0 Aug.2019