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EDX5116ABSE-3B-E Datasheet

  • EDX5116ABSE-3B-E

  • 512M bits XDR DRAM (32M words ?16 bits)

  • 3580.77KB

  • 78页

  • ELPIDA

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EDX5116ABSE
Calibration Transactions
Figure 35 shows the calibration transaction diagrams for the
XDR DRAM device. There is one calibration operation sup-
ported: calibration of the output current level I
OL
for each
DQi and DQNi pin.
The output current calibration sequence is shown in the upper
diagram. It begins when a period of t
CMD-CALC
is observed
after the last RQ packet (with command 鈥淐MD a鈥?in this
example). No request packets should be issued in this period.
A COLX packet with a鈥滳ALC b鈥?command is then issued to
start the current calibration sequence. A period of t
CALCE
is
observed after this packet. No request packets should be issued
during this period.
A COLX packet with a 鈥淐ALE c鈥?command is then issued to
end the current calibration sequence. A period of t
CALE-CMD
is
observed after this packet. No request packets should be issued
during this period. The first request packet may then be issued
(with command 鈥淐MD d鈥?in this example).
A second current calibration sequence must be started within
an interval of t
CALC
. In this example, the next COLX packet
with a 鈥淐ALC e鈥?command starts a subsequent sequence.
The dynamic termination calibration sequence is shown in the
lower diagram. Note that this memory component does not
use this sequence; termination calibration is performed during
the manufacturing process. However, the termination sequence
shown will be issued by the controller for those memory com-
ponents which do use a periodic calibration mechanism.
It begins when a period of t
CMD-CALZ
is observed after the
packet at edge T
0
(with command CMDa in this example). No
request packets should be issued in this period.
A COLX packet with a CALZ command is then issued at edge
T
3
to start the termination calibration sequence. A second
period of t
CALZE
is observed after this packet. No request
packets should be issued during this period.
A COLX packet with a CALE command is then issued at edge
T
6
to end the termination calibration sequence. A third period
of t
CALE-CMD
is observed after this packet. No request packets
should be issued during this period. The first request packet
may be issued at edge T
12
(with command CMDd in this exam-
ple).
A second termination calibration sequence must be started
within an interval of t
CALZ
. In this example, the next COLX
packet with a CALZ command occurs at edge T
20
.
Note that the labels for the CFM clock edges (of the form T
i
)
are not to scale, and are used to identify events in the diagrams.
Preliminary Data Sheet E0643E30 (Ver. 3.0)
42

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