k4r881869e Samsung Semiconductor, Inc., k4r881869e Datasheet - Page 17

• Manufacturer Part Number: k4r881869e
• Description: 288mbit Rdram 512k X 18bit X 32s Banks
• Manufacturer: Samsung Semiconductor, Inc.

K4R881869E
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 packets 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
bank.
Row Precharge time of RDRAM banks - the interval between ROWR packet
with PRER
same bank.
Precharge-to-precharge time of RDRAM device - the interval between succes-
sive ROWR packets with PRER
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 command to
COLC packet with RD or WR command). Note - the RAS-to-CAS delay seen
by the RDRAM core (t
ences in the row and column paths through the RDRAM interface.
CAS Access delay - the interval from RD command to Q read data. The equa-
tion 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
the TPARM register in Figure 40.
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.
CAC
a
command and next ROWA packet with ACT command to the
is given in the TPARM register in Figure 40.
RCD-C
) is equal to t
a
Description
commands to any banks of the same device.
Table 13: Timing Parameter Summary
RCD-C
= 1 + t
a
command to the same
RCD
Page 15
because of differ-
OFFP
is given in
CYCLE
.
-1200
Min
-32
32
22
10
8
8
9
9
4
4
8
4
4
4
6
-1066
-32P
Min
28
20
8
8
8
9
8
6
4
4
8
4
4
4
-800
Min
-40
28
20
Version 1.4 Dec. 2003
8
8
8
7
8
6
4
4
8
4
4
4
Direct RDRAM
Min
-800
-45
28
20
8
8
8
9
8
6
4
4
8
4
4
4
64µs
Max
12
6
4
4
-
-
-
-
-
-
-
-
-
b
t
t
t
t
t
t
t
t
t
t
t
t
t
t
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
CYCLE
Units Figure(s)
Figure 16
Figure 17
Figure 16
Figure 17
Figure 16
Figure 17
Figure 13
Figure 14
Figure 16
Figure 17
Figure 5
Figure 40
Figure 5
Figure 16
Figure 17
Figure 3
Figure 18
Figure 15
Figure 40
Figure 16
Figure 17
™