MT40A512M8RH-083E Datasheet, PDF (202/365 Pages) Micron Technology – Programmable data strobe preambles

4Gb: x4, x8, x16 DDR4 SDRAM
READ Operation
Figure 137: READ (BC4) to READ (BL8) OTF with 1^tCK Preamble in Different Bank Group
T0
T1
T2
T3
T4
T9
T10
T11
T12
T13
T14
T15
T16
T17
T18
T19
T20
T21
CK_c
CK_t
Command READ
Bank Group
BGa
Address
Address
Bank
Col n
DQS_t,
DQS_c
DQ
DES
DES
DES
READ
DES
DES
DES
DES
DES
DES
DES
DES
DES
DES
DES
DES
DES
t_{CCD_S = 4}
BGb
Bank
Col b
t_RPRE
t_RPST
t_RPRE
t_RPST
RL = 11
DO DO DO DO
n n+1 n+2 n+3
RL = 11
DO DO DO DO DO DO DO DO
b b+1 b+2 b+3 b+4 b+5 b+6 b+7
Time Break
Transitioning Data
Don’t Care
Notes:
1. BL = 8, AL =0, CL = 11, Preamble = 1^tCK.
2. DO n (or b) = data-out from column n (or column b).
3. DES commands are shown for ease of illustration; other commands may be valid at
these times.
4. BC4 setting activated by MR0[1:0] = 01 and A12 = 0 during READ commands at T0. BL8
setting activated by MR0[1:0] = 01 and A12 = 1 during READ commands at T4.
5. CA parity = Disable, CS to CA latency = Disable, Read DBI = Disable.
Figure 138: READ (BC4) to READ (BL8) OTF with 2^tCK Preamble in Different Bank Group
T0
T1
T2
T3
T4
T9
T10
T11
T12
T13
T14
T15
T16
T17
T18
T19
T20
T21
CK_c
CK_t
Command READ
Bank Group
BGa
Address
Address
Bank
Col n
DQS_t,
DQS_c
DQ
DES
DES
DES
READ
DES
DES
DES
DES
DES
DES
DES
DES
DES
DES
DES
DES
DES
t_{CCD_S = 4}
BGb
Bank
Col b
t_RPRE
t_RPST
RL = 11
DO DO DO DO
n n+1 n+2 n+3
RL = 11
DO DO DO DO DO DO DO DO
b b+1 b+2 b+3 b+4 b+5 b+6 b+7
Time Break
Transitioning Data
Don’t Care
Notes:
1. BL = 8, AL = 0, CL = 11, Preamble = 2^tCK.
2. DO n (or b) = data-out from column n (or column b).
3. DES commands are shown for ease of illustration; other commands may be valid at
these times.
4. BC4 setting activated by MR0[1:0] = 01 and A12 = 0 during READ commands at T0. BL8
setting activated by MR0[1:0] = 01 and A12 = 1 during READ commands at T4.
5. CA parity = Disable, CS to CA latency = Disable, Read DBI = Disable.
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4gb_ddr4_dram.pdf - Rev. G 1/17 EN
202
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