Datasheet

Postamble
Read Postamble
Whether the 1 t
CK
or 2 t
CK
Read Preamble Mode is selected, the Read Postamble remains the same at 1/2 t
CK
.
DDR4 will support a fixed read postamble.
Read postamble of nominal 0.5 t
CK
for preamble modes 1,2 t
CK
are shown below:
DQS, DQS#
DQ
DQ
Preamble
Preamble
DQS, DQS#
1t
CK
toggle
2t
CK
toggle
Postamble
Postamble
Figure 84. READ Postamble
Write Postamble
Whether the 1 t
CK
or 2 t
CK
Write preamble mode is selected, the Write postamble remains the same at 1/2 t
CK
.
DDR4 will support a fixed Write postamble.
Write postamble nominal is 0.5 t
CK
for preamble modes 1,2 t
CK
are shown below:
DQS, DQS#
DQ
DQ
Preamble
Preamble
DQS, DQS#
1t
CK
toggle
2t
CK
toggle
Postamble
Postamble
Figure 85. WRITE Postamble
AS4C256M16D4
Confidential
- 88 of 201 -
Rev.1.0 Aug.2019