k4r881869m Samsung Semiconductor, Inc., k4r881869m Datasheet - Page 21

• Manufacturer Part Number: k4r881869m
• Description: 288mbit Rdram 512k X 18 Bit X 2*16 Dependent Banks Direct Rdramtm
• Manufacturer: Samsung Semiconductor, Inc.

K4R881869M
CTM/CFM
COL4
DQA8..0
COLC Packet: WDA Precharge Offset
CTM/CFM
COL4
DQA8..0
COLX Packet: PREX Precharge Offset
CTM/CFM
COL4
DQA8..0
DQB8..0
DQB8..0
DQB8..0
COLC Packet: RDA Precharge Offset
ROW2
ROW2
ROW2
..COL0
..COL0
..COL0
..ROW0
..ROW0
..ROW0
The PREX precharge command is equivalent to a PRER command here
T
T
T
0
0
0
ACT a0
ACT a0
ACT a0
T
T
T
1
1
1
T
T
T
The RDA precharge is equivalent to a PRER command here
2
2
The WRA precharge (triggered by the automatic retire) is equivalent to a PRER command here
2
T
T
T
3
3
3
T
T
T
Transaction a: WR
4
4
4
Transaction a: RD
Transaction a: RD
T
T
T
5
5
5
T
T
T
6
6
6
T
T
T
7
7
7
Figure 14: Offsets for Alternate Precharge Mechanisms
T
T
T
8
8
8
T
T
T
9
9
9
WR a1
RD a1
RD a1
T
T
T
10
10
10
T
T
T
11
11
11
T
T
T
12
12
12
T
T
T
13
a0 = {Da,Ba,Ra}
13
a0 = {Da,Ba,Ra}
13
a0 = {Da,Ba,Ra}
WRA a2
RD a2
RD a2
T
T
T
14
14
14
T
T
T
15
15
15
T
T
T
16
16
16
T
T
T
retire (a1)
MSK (a1)
17
17
17
RD a3
RD a3
T
T
T
18
18
18
T
T
T
19
19
19
Page 19
D (a1)
T
T
T
20
20
20
T
T
T
t
retire (a2)
MSK (a2)
21
21
RTR
21
PREX a5
RDA a4
Q (a1)
RD a4
Q (a1)
T
T
T
a1 = {Da,Ba,Ca1}
a3 = {Da,Ba,Ca3}
a1 = {Da,Ba,Ca1}
a1 = {Da,Ba,Ca1}
a3 = {Da,Ba,Ca3}
22
22
22
T
T
T
23
23
23
D (a2)
T
T
T
24
24
24
T
T
T
25
PRER a5
25
PRER a5
25
PRER a5
Q (a2)
Q (a2)
T
T
T
26
26
26
T
T
T
27
27
27
T
T
T
28
28
28
T
T
T
29
29
29
t
t
t
OFFP
Q (a3)
Q (a3)
T
T
T
OFFP
OFFP
30
30
30
T
T
T
a2 = {Da,Ba,Ca2}
a4 = {Da,Ba,Ca4}
a2 = {Da,Ba,Ca2}
a2 = {Da,Ba,Ca2}
a4 = {Da,Ba,Ca4}
31
31
31
T
T
T
32
32
32
T
T
T
33
33
33
ACT b0
ACT b0
ACT b0
Q (a4)
Q (a4)
T
T
T
34
34
34
T
T
T
35
35
35
Preliminary
Direct RDRAM
Rev. 0.9 Jan. 2000
T
T
T
36
36
36
T
T
T
37
37
37
T
T
T
38
38
38
T
T
T
39
39
39
T
T
T
40
40
40
T
a5 = {Da,Ba}
T
a5 = {Da,Ba}
T
a5 = {Da,Ba}
41
41
41
T
T
T
42
42
42
T
T
T
43
43
43
T
T
T
44
44
44
T
T
T
45
45
45
T
T
T
46
46
46
T
T
T
47
47
47
™