Datasheet
Burst Read Operation with Command/Address Parity
DON'T CARE
NOTE 1. BL = 8, AL = 0, CL = 11, PL = 4, (RL = CL + AL + PL = 15), Preamble = 1t
CK
NOTE 2. Dout n (or b) = data-out from column n ( or 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 T4.
NOTE 5. CA Parity =Enable, CS to CA Latency = Disable, Read DBI = Disable.
T0 T1 T2 T4 T13 T14 T15 T16
T17
T18
TRANSITIONING DATA
RL = 15
CK#
CK
DQ
CMD
T19
DESREAD DES READ DES DES DES DES DES DES DES
DES
ADDR
Prity
DES
T20 T21
DES
DES
T22 T23
t
RPRE
DES
T24
BG a BG b
t
CCD_S = 4
Bank
Col n
Bank
Col b
Dout
n
Dout
n+1
Dout
n+2
Dout
b+7
Dout
n+3
Dout
n+4
Dout
n+5
Dout
n+6
Dout
n+7
Dout
b
Dout
b+1
Dout
b+2
Dout
b+3
Dout
b+4
Dout
b+5
Dout
b+6
RL = 15
t
RPST
Bank Group
ADDR
DQS, DQS#
Figure 117. Consecutive READ (BL8) with 1t
CK
Preamble and CA Parity in Different Bank Group
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 setting activated by MR0[A1:A0 = 0:1] and A12 = 0 during READ command at T0. BL8 setting activated by MR0[A1:A0 = 0:1] and A12 = 1 during 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 T8 T9 T14 T15 T16 T17
T18
T19
TRANSITIONING DATA
t
RPRE
t
WPST
Dout
n
Dout
n+1
Dout
n+2
Din
b+7
WL = 13
CK#
CK
DQ
ADDR
Parity
CMD
T20
DESREAD WRITE DES DES DES DES DES DES DES DES
DES
Bank
Col n
BG a
Bank Group
ADDR
DES
DQS, DQS#
T21 T22
RL = 15
BG a or
BG b
DES
DES
T23 T24
Bank
Col b
Din
b
Din
b+5
Din
b+6
Dout
n+3
t
RPST
t
WPRE
Din
b+1
Din
b+2
Din
b+3
Din
b+4
READ to WRITE Command Delay
= RL +BL/2 - WL + 2t
CK
t
WR
4 Clocks
t
WTR
T25
DES
Dout
n+5
Dout
n+6
Dout
n+3
Dout
n+4
Figure 118. READ (BL8) to WRITE (BL8) with 1t
CK
Preamble and CA parity in Same or Different Bank
Group
AS4C256M16D4
Confidential
- 108 of 201 -
Rev.1.0 Aug.2019