K4R881869D Samsung semiconductor, K4R881869D Datasheet - Page 17

• Manufacturer Part Number: K4R881869D
• Description: 256/288Mbit RDRAM(D-die)
• Manufacturer: Samsung semiconductor

K4R571669D/K4R881869D
Timing Parameters
a. Or equivalent PREC or PREX command. See Figure 15.
b. This is a constraint imposed by the core, and is therefore in units of µs rather than t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
Parameter
RC
RAS
RP
PP
RR
RCD
CAC
CWD
CC
PACKET
RTR
OFFP
RDP
RTP
Row Cycle time of RDRAM banks -the interval between ROWA pack-
ets with ACT commands to the same bank.
RAS-asserted time of RDRAM bank - the interval between ROWA
packet with ACT command and next ROWR packet with PRER
mand to the same bank.
Row Precharge time of RDRAM banks - the interval between ROWR
packet with PRER
mand to the same bank.
Precharge-to-precharge time of RDRAM device - the interval between
successive ROWR packets with PRER
same device.
RAS-to-RAS time of RDRAM device - the interval between successive
ROWA packets with ACT commands to any banks of the same device.
RAS-to-CAS Delay - the interval from ROWA packet with ACT com-
mand to COLC packet with RD or WR command). Note - the RAS-to-
CAS delay seen by the RDRAM core (t
t
RDRAM interface.
CAS Access delay - the interval from RD command to Q read data. The
equation for t
CAS Write Delay (interval from WR command to D write data.
CAS-to-CAS time of RDRAM bank - the interval between successive
COLC commands).
Length of ROWA, ROWR, COLC, COLM or COLX packet.
Interval from COLC packet with WR command to COLC packet which
causes retire, and to COLM packet with bytemask.
The interval (offset) from COLC packet with RDA command, or from
COLC packet with retire command (after WRA automatic precharge),
or from COLC packet with PREC command, or from COLX packet
with PREX command to the equivalent ROWR packet with PRER. The
equation for t
Interval from last COLC packet with RD command to ROWR packet
with PRER.
Interval from last COLC packet with automatic retire command to
ROWR packet with PRER.
RCD
because of differences in the row and column paths through the
CAC
OFFP
is given in the TPARM register in Figure 40.
a
is given in the TPARM register in Figure 40.
command and next ROWA packet with ACT com-
Description
a
Table 13: Timing Parameter Summary
RCD-C
commands to any banks of the
) is equal to t
RCD-C
Page 15
a
com-
= 1 +
CYCLE
-1066
-32P
Min
28
20
8
8
8
9
8
6
4
4
8
4
4
4
.
-1066
Min
-32
28
20
8
8
8
9
9
6
4
4
8
4
4
4
-1066
Min
-35
32
22
10
8
8
9
9
6
4
4
8
4
4
4
-800
Min
-40
28
20
8
8
8
7
8
4
4
8
4
4
4
6
Version 1.4 July 2002
Min
-800
-45
28
20
8
8
8
9
8
6
4
4
8
4
4
4
Direct RDRAM
64µs
Max
12
4
4
6
-
-
-
-
-
-
-
-
-
b
t
t
t
t
t
t
t
t
t
t
t
t
t
t
Units
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
Figure(s)
Figure 16
Figure 17
Figure 16
Figure 17
Figure 16
Figure 17
Figure 13
Figure 14
Figure 16
Figure 17
Figure 40
Figure 16
Figure 17
Figure 18
Figure 15
Figure 40
Figure 16
Figure 17
Figure 5
Figure 5
Figure 3
™