tc59ym916bkg24a ETC-unknow, tc59ym916bkg24a Datasheet - Page 14

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

Request Field Interactions
commands that perform memory operations (including refresh commands). This includes all commands in ROWA,
ROWP, COL, and COLM packets. The commands in COLX packets are described in later sections. See
“Maintenance Operations” on page 40.
these two packet/commands is 0*t
interaction between the two packet/commands. If the minimum possible spacing is 0*t
limit” is shown in the table.
use of the delay field with a command will delay the position of the effective packet/command from the position of
the actual packet/command. See “Dynamic Request Scheduling” on page 20.
constraints. Therefore, both the horizontal columns (packet “a”) and vertical rows (packet “b”) of the interaction
table are divided into four major groups.
:
;
;
;
a.
b.
c.
d.
Activate Row [A]
ROWA – ACT Ba
ROWP – REFA Ba
ROWP – REFI Ba
Read Column [R]
COL – RD Ba
Write Column [W]
COL – WR Ba
COLM – WRM Ba
Precharge Row [P]
ROWP – PRE Ba
ROWP – REFP Ba Ba,Bb same Case PAs: t
A summary of request packet interactions is shown in Table 7. Each case is limited to request packets with
Request packet/command “a” is followed by request packet/command “b”. The minimum possible spacing between
Note that the spacing values shown in the table are relative to the
Any of the packet/command encoding under one of the four operation types is equivalent in terms of the resource
The four possible operation types for request packets a and b include:
First packet command to bank
t
See “Propagation Delay” on page 30.
A PRE command is needed between the RD and ACT/REFA commands or the WR/WRM and ACT/REFA commands.
t
An ACT command is needed between the PRE/REFP and RD commands or the PRE/REFP and WR/WRM commands.
[A] Activate Row
[R] Read Column
[W] Write Column
[P] Precharge Row
∆RW
∆WR
See Examples:
is equal to t
is defined in Table 17.
Ba
Ba,Bb
different
Ba,Bb same Case AAs: t
Ba,Bb
different
Ba,Bb same Case RAs
Ba,Bb
different
Ba,Bb same Case WAs
Ba,Bb
different
CC
+ t
RW
−
BUB,XDR DRAM
Case AAd: t
Case RAd: No limit
Case WAd: No limit
Case PAd: No limit
•
•
•
•
•
•
•
•
ROWP – REFA Bb
ROWP – REFI Ba
ROWA – ACT Bb
Activate Row [A]
CYCLE
Table 7. Packet Interaction Summary
ROWA/ACT
ROWP/REFA
ROWP/REFI
COL/RD
COL/WR
COLM/WRM
ROWP/PRE
ROWP/REFP
Figure 4
b
b
: t
: t
RC
RP
RR
. However, a larger time interval may be needed because of a resource
+ t
RDP
WRP
CAC
+t
+t
RP
− t
RP
TC59YM916BKG24A,32A,32B,40B,32C,40C
CWD
Case ARd: No limit
Case ARs: t
Case RRd: t
Case RRs: t
Case WRd
Case WRs
Case PRd: No limit
Case PRs
and is defined in Table 17. This also depends upon propagation delay –
Read Column [R]
COL – RD Bb
Second packet/command to bank Bb
Figure 5
d
c
c
: t
: t
RCD-R
: t
CC
CC
RP
∆WR
∆WR
+t
RCD-R
effective
Case AWd: No limit
Case AWs: t
Case RWd
Case RWs
Case WWd: t
Case WWs: t
Case PWd: No limit
Case PWs
COLM – WRM Bb
Write Column [W]
beginning of a packet/command. The
COL – WR Bb
Figure 6
d
a
a
: t
: t
: t
RCD-W
CC
CC
RP
∆RW
∆RW
CYCLE
+t
RCD-W
2004-12-15 14/76
, then an entry of “No
Case PPd: t
Case APd: No limit
Case APs: t
Case RPd: No limit
Case RRs: t
Case WPd: No limit
Case WPs: t
Case PPs: t
ROWP – REFP Bb
Precharge Row[P]
ROWP – PRE Bb
Figure 7
Rev 0.1
RAS
PP
RC
RDP
WRP