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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
Dynamic Request Scheduling
Delay fields are present in the ROWA, COL, and ROWP pack-
ets. They permit the associated command to optionally wait for
a time of one (or more) t
CYCLE
before taking effect. This
allows a memory controller more scheduling flexibility when
issuing request packets. Figure 8 illustrates the use of the delay
fields.
In the first timing diagram, a ROWA packet with an ACT com-
mand is present at cycle T
0
. The DELA field is set to 鈥?鈥? This
request packet will be equivalent to a ROWA packet with an
ACT command at cycle T
1
with the DELA field is set to 鈥?鈥?
This equivalence should be used when analyzing request packet
interactions.
In the second timing diagram, a COL packet with a RD com-
mand is present at cycle T
0
. The DELC field is set to 鈥?鈥? This
request packet will be equivalent to a COL packet with an RD
command at cycle T
1
with the DELC field is set to 鈥?鈥? This
equivalence should be used when analyzing request packet
interactions.
In a similar fashion, a COL packet with a WR command is
present at cycle T
12
. The DELC field is set to 鈥?鈥? This request
packet will be equivalent to a COL packet with a WR com-
mand at cycle T
13
with the DELC field is set to 鈥?鈥? This
equivalence should be used when analyzing request packet
interactions.
In the COL packet with a RD command example, the read data
delay T
CAC
is measured between the Q read data packet and
the virtual COL packet at cycle T
1
.
Likewise, for the example with the COL packet with a WR
command, the write data delay T
CWD
is measured between the
D write data packet and the virtual COL packet at cycle T
13
.
In the third timing diagram, a ROWP packet with a PRE com-
mand is present at cycle T
0
. The DEL field (POP[1:0]) is set to
鈥?1鈥? This request packet will be equivalent to a ROWP packet
with a PRE command at cycle T
1
with the DEL field is set to
鈥?0鈥? it will be equivalent to a ROWP packet with a PRE com-
mand at cycle T
2
with the DEL field is set to 鈥?1鈥? and it will
be equivalent to a ROWP packet with a PRE command at cycle
T
3
with the DEL field is set to 鈥?0鈥? This equivalence should
be used when analyzing request packet interactions.
In the fourth timing diagram, a ROWP packet with a REFP
command is present at cycle T
0
. The DEL field (RA[7:6]) is set
to 鈥?1鈥? This request packet will be equivalent to a ROWP
packet with a REFP command at cycle T
1
with the DEL field
is set to 鈥?0鈥? it will be equivalent to a ROWP packet with a
REFP command at cycle T
2
with the DEL field is set to 鈥?1鈥?
and it will be equivalent to a ROWP packet with a REFP com-
mand at cycle T
3
with the DEL field is set to 鈥?0鈥? This equiv-
alence should be used when analyzing request packet
interactions.
The two examples for the REFA and REFI commands are
identical to the example just described for the REFP com-
mand.
The ROWP packet allows two independent operations to be
specified. A PRE precharge command uses the POP and BP
fields, and the REFP, REFA, or REFI commands uses the
ROP and RA fields. Both operations have an optional delay
field (the POP field for the PRE command and the RA field
with the REFP, REFA, or REFI commands). The two delay
mechanisms are independent of one another. The POP field
does not affect the timing of the REFP, REFA, or REFI com-
mands, and the RA field does not affect the timing of the PRE
command.
When the interactions of a ROWP packet are analyzed, it must
be remembered that there are two independent commands
specified, both of which may affect how soon the next request
packet can be issued. The constraints from both commands in
a ROWP packet must be considered, and the one that requires
the longer time interval to the next request packet must be
used by the memory controller. Furthermore, the two com-
mands within a ROWP packet may not reference the same
bank in the BP and RA fields.
Preliminary Data Sheet E0643E30 (Ver. 3.0)
20

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