tc59ym916bkg24a ETC-unknow, tc59ym916bkg24a Datasheet - Page 20

• Manufacturer Part Number: tc59ym916bkg24a
• Description: The Second Generation 512-megabit Xdrtm Dram
• Manufacturer: ETC-unknow

Dynamic Request Scheduling
optionally wait for a time of one (or more) t
scheduling flexibility when issuing request packets. Figure 8 illustrates the use of the delay fields.
to “1”. This request packet will be equivalent to a ROWA packet with an ACT command at cycle T
field is set to “0”. This equivalence should be used when analyzing request packet interactions.
“1”. This request packet will be equivalent to a COL packet with an RD command at cycle T
set to “0”. This equivalence should be used when analyzing request packet interactions.
request packet will be equivalent to a COL packet with a WR command at cycle T
“0”. This equivalence should be used when analyzing request packet interactions.
packet and the virtual COL packet at cycle T
between the D write data packet and the virtual COL packet at cycle T
[1:0]) is set to “11”. This request packet will be equivalent to a ROWP packet with a PRE command at cycle T
the DEL field is set to “10”, it will be equivalent to a ROWP packet with a PRE command at cycle T
field is set to “01”, and it will be equivalent to a ROWP packet with a PRE command at cycle T
is set to “00”. This equivalence should be used when analyzing request packet interactions.
[7:6]) is set to “11”. This request packet will be equivalent to a ROWP packet with a REFP command at cycle T
with the DEL field is set to “10”, it will be equivalent to a ROWP packet with a REFP command at cycle T
DEL field is set to “01”, and it will be equivalent to a ROWP packet with a REFP command at cycle T
DEL field is set to “00”. This equivalence should be used when analyzing request packet interactions.
command.
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 commands, and the RA field does not affect the timing of the PRE command.
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 commands within a ROWP
packet may not reference the same bank in the BP and RA fields.
Delay fields are present in the ROWA, COL, and ROWP packets. They permit the associated command to
In the first timing diagram, a ROWA packet with an ACT command is present at cycle T
In the second timing diagram, a COL packet with a RD command is present at cycle T
In a similar fashion, a COL packet with a WR command is present at cycle T
In the COL packet with a RD command example, the read data delay. t
Likewise, for the example with the COL packet with a WR command, the write data delay. t
In the third timing diagram, a ROWP packet with a PRE command is present at cycle T
In the fourth timing diagram, a ROWP packet with a REFP command is present at cycle T
The two examples for the REFA and REFI commands are identical to the example just described for the REFP
The ROWP packet allows two independent operations to be specified. A PRE precharge command uses the POP
When the interactions of a ROWP packet are analyzed, it must be remembered that there are two independent
CYCLE
1
.
TC59YM916BKG24A,32A,32B,40B,32C,40C
before taking effect. This allows a memory controller more
13
.
CAC
is measured between the Q read data
12
. The DELC field is set to “1”. This
13
with the DELC field is set to
0
. The DELC field is set to
0
0
. The DEL field (POP
2004-12-15 20/76
. The DELA field is set
1
0
with the DELC field is
. The DEL field (RA
CWD
3
with the DEL field
1
2
with the DELA
is measured
with the DEL
3
with the
Rev 0.1
2
with the
1
1
with