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KMMR16R84(6/8/C/G)C
KMMR18R84(6/8/C/G)C
Preliminary
4/6/8/12/16d RIMMTM Module with 128Mb RDRAMs
4/6/8/12/16d RIMMTM Module with 144Mb RDRAMs
Overview
The Rambus® RIMM™ module is a general purpose high-
performance memory subsystem suitable for use in a broad
range of applications including computer memory, personal
computers, workstations, and other applications where high
bandwidth and low latency are required.
The Rambus RIMM module consists of 128Mb/144Mb
Direct Rambus DRAM devices. These are extremely high-
speed CMOS DRAMs organized as 8M words by 16 or 18
bits. The use of Rambus Signaling Level (RSL) technology
permits 600MHz or 800MHz transfer rates while using
conventional system and board design technologies.
RDRAM devices are capable of sustained data transfers at
1.25 ns per two bytes (10ns per 16 bytes).
The RDRAM architecture enables the highest sustained
bandwidth for multiple, simultaneous, randomly addressed,
memory transactions. The separate control and data buses
with independent row and column control yield over 95%
bus efficiency. The RDRAM's 32-banks architecture
supports up to four simultaneous transactions per device.
Features
High speed 800 and 600MHz RDRAM storage
184 edge connector pads with 1mm pad spacing
Maximum module PCB size : 133.5mm x 34.93mm x
1.37mm (5.21x 1.375x 0.05)
Each RDRAM has 32 banks, for a total of 512, 384, 256,
192, or 128 banks on each 256/288MB, 192/216MB,
128/144MB, 96/108MB, or 64/72MB module respectively
Gold plated edge connector pad contacts
Serial Presence Detect(SPD) support
Operates from a 2.5 volt supply (±5%)
Low power and powerdown self refresh modes
Separate Row and Column buses for higher efficiency
RDRAMs use µ−BGA package type
Key Timing Parameters/Part Numbers
The following table lists the frequency and latency bins
available from RIMM modules. An optional ‘S’designator
instead of ‘R’followed by ‘hyphen(-)’indicates low power
modules.
TABLE 1. Part Number by Freq. & Latency
Speed
Organization
I/O trac (Row
Binning Freq. Access
MHz Time) ns
Part Numbera
32M x 16/18
48M x 16/18
64M x 16/18
96M x 16/18
128M x 16/18
-RG6
-RK8
-RM8
-RG6
-RK8
-RM8
-RG6
-RK8
-RM8
-RG6
-RK8
-RM8
-RG6
-RK8
-RM8
600
800
800
600
800
800
600
800
800
600
800
800
600
800
800
53 KMMR16/18R84C-RG6
45 KMMR16/18R84C-RK8
40 KMMR16/18R84C-RM8
53 KMMR16/18R86C-RG6
45 KMMR16/18R86C-RK8
40 KMMR16/18R86C-RM8
53 KMMR16/18R88C-RG6
45 KMMR16/18R88C-RK8
40 KMMR16/18R88C-RM8
53 KMMR16/18R8CC-RG6
45 KMMR16/18R8CC-RK8
40 KMMR16/18R8CC-RM8
53 KMMR16/18R8GC-RG6
45 KMMR16/18R8GC-RK8
40 KMMR16/18R8GC-RM8
a. -S designator is used for modules with lower self-refresh current.
Form Factor
The Rambus RIMM modules are offered in a 184-pad 1mm
edge connector pad pitch form factor suitable for 184 contact
RIMM connectors. The RIMM module is suitable for
desktop and other system applications.
Note: On two sided modules, RDRAMs are also installed on bottem side of PCB.
Figure 1: Rambus RIMM Module without heat spreader
Page 1
Rev.0.9 Apr. 1999

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KMMR16R84(6/8/C/G)C
KMMR18R84(6/8/C/G)C
Preliminary
4/6/8/12/16d RIMMTM Module with 128Mb RDRAMs
4/6/8/12/16d RIMMTM Module with 144Mb RDRAMs
TABLE 2. Module Pad Number and Signal Names
Pin Pin Name Pin Pin Name
A1 Gnd
A2 LDQA8
A3 Gnd
A4 LDQA6
A5 Gnd
A6 LDQA4
A7 Gnd
A8 LDQA2
A9 Gnd
A10 LDQA0
A11 Gnd
A12 LCTMN
A13 Gnd
A14 LCTM
A15 Gnd
A16 NC
A17 Gnd
A18 LROW1
A19 Gnd
A20 LCOL4
A21 Gnd
A22 LCOL2
A23 Gnd
A24 LCOL0
A25 Gnd
A26 LDQB1
A27 Gnd
A28 LDQB3
A29 Gnd
A30 LDQB5
A31 Gnd
A32 LDQB7
A33 Gnd
A34 LSCK
A35 Vcmos
A36 SOUT
A37 Vcmos
A38 NC
A39 Gnd
A40 NC
A41 Vdd
A42 Vdd
A43 NC
A44 NC
A45 NC
A46 NC
B1 Gnd
B2 LDQA7
B3 Gnd
B4 LDQA5
B5 Gnd
B6 LDQA3
B7 Gnd
B8 LDQA1
B9 Gnd
B10 LCFM
B11 Gnd
B12 LCFMN
B13 Gnd
B14 NC
B15 Gnd
B16 LROW2
B17 Gnd
B18 LROW0
B19 Gnd
B20 LCOL3
B21 Gnd
B22 LCOL1
B23 Gnd
B24 LDQB0
B25 Gnd
B26 LDQB2
B27 Gnd
B28 LDQB4
B29 Gnd
B30 LDQB6
B31 Gnd
B32 LDQB8
B33 Gnd
B34 LCMD
B35 Vcmos
B36 SIN
B37 Vcmos
B38 NC
B39 Gnd
B40 NC
B41 Vdd
B42 Vdd
B43 NC
B44 NC
B45 NC
B46 NC
Pin
A47
A48
A49
A50
A51
A52
A53
A54
A55
A56
A57
A58
A59
A60
A61
A62
A63
A64
A65
A66
A67
A68
A69
A70
A71
A72
A73
A74
A75
A76
A77
A78
A79
A80
A81
A82
A83
A84
A85
A86
A87
A88
A89
A90
A91
A92
Pin Name
NC
NC
NC
NC
Vref
Gnd
SCL
Vdd
SDA
SVdd
SWP
Vdd
RSCK
Gnd
RDQB7
Gnd
RDQB5
Gnd
RDQB3
Gnd
RDQB1
Gnd
RCOL0
Gnd
RCOL2
Gnd
RCOL4
Gnd
RROW1
Gnd
NC
Gnd
RCTM
Gnd
RCTMN
Gnd
RDQA0
Gnd
RDQA2
Gnd
RDQA4
Gnd
RDQA6
Gnd
RDQA8
Gnd
Pin
B47
B48
B49
B50
B51
B52
B53
B54
B55
B56
B57
B58
B59
B60
B61
B62
B63
B64
B65
B66
B67
B68
B69
B70
B71
B72
B73
B74
B75
B76
B77
B78
B79
B80
B81
B82
B83
B84
B85
B86
B87
B88
B89
B90
B91
B92
Pin Name
NC
NC
NC
NC
Vref
Gnd
SA0
Vdd
SA1
SVdd
SA2
Vdd
RCMD
Gnd
RDQB8
Gnd
RDQB6
Gnd
RDQB4
Gnd
RDQB2
Gnd
RDQB0
Gnd
RCOL1
Gnd
RCOL3
Gnd
RROW0
Gnd
RROW2
Gnd
NC
Gnd
RCFMN
Gnd
RCFM
Gnd
RDQA1
Gnd
RDQA3
Gnd
RDQA5
Gnd
RDQA7
Gnd
Page 2
Rev.0.9 Apr. 1999

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KMMR16R84(6/8/C/G)C
KMMR18R84(6/8/C/G)C
Preliminary
4/6/8/12/16d RIMMTM Module with 128Mb RDRAMs
4/6/8/12/16d RIMMTM Module with 144Mb RDRAMs
TABLE 3. Module Connector Pad Description
Signal
Gnd
LCFM
Pins
A1, A3, A5, A7, A9, A11, A13, A15,
A17, A19, A21, A23, A25, A27, A29,
A31, A33, A39, A52, A60, A62, A64,
A66, A68, A70, A72, A74, A76, A78,
A80, A82, A84, A86, A88, A90, A92,
B1, B3, B5, B7, B9, B11, B13, B15,
B17, B19, B21, B23, B25, B27, B29,
B31, B33, B39, B52, B60, B62, B64,
B66, B68, B70, B72, B74, B76, B78,
B80, B82, B84, B86, B88, B90, B92
B10
LCFMN B12
LCMD
B34
LCOL4..
LCOL0
LCTM
A20, B20, A22, B22, A24
A14
LCTMN A12
LDQA8.. A2, B2, A4, B4, A6, B6, A8, B8, A10
LDQA0
LDQB8..
LDQB0
B32, A32, B30, A30, B28, A28, B26,
A26, B24
LROW2..
LROW0
LSCK
B16, A18, B18
A34
NC
RCFM
A16, B14, A38, B38, A40, B40, A43,
B43, A44, B44, A45, B45, A46, B46,
A47, B47, A48, B48, A49, B49, A50,
B50, A77, B79
B83
RCFMN B81
RCMD
B59
RCOL4..
RCOL0
A73, B73, A71, B71, A69
I/O Type Description
Ground reference for RDRAM core and interface. 72
PCB connector pads.
I
RSL
Clock from master. Interface clock used for receiving
RSL signals from the Channel. Positive polarity.
I
RSL
Clock from master. Interface clock used for receiving
RSL signals from the Channel. Negative polarity.
I
VCMOS
Serial Command used to read from and write to the con-
trol registers. Also used for power management.
I
RSL
Column bus. 5-bit bus containing control and address
information for column accesses.
I
RSL
Clock to master. Interface clock used for transmitting
RSL signals to the Channel. Positive polarity.
I
RSL
Clock to master. Interface clock used for transmitting
RSL signals to the Channel. Negative polarity.
Data bus A. A 9-bit bus carrying a byte of read or write
I/O RSL data between the Channel and the RDRAM. LDQA8 is
non-functional on modules with x16 RDRAM devices
Data bus B. A 9-bit bus carrying a byte of read or write
I/O RSL data between the Channel and the RDRAM. LDQB8 is
non-functional on modules with x16 RDRAM devices.
I
RSL
Row bus. 3-bit bus containing control and address infor-
mation for row accesses.
I
VCMOS
Serial Clock input. Clock source used to read from and
write to the RDRAM control registers.
These pads are not connected. These 24 connector pads
are reserved for future use.
I
RSL
Clock from master. Interface clock used for receiving
RSL signals from the Channel. Positive polarity.
I
RSL
Clock from master. Interface clock used for receiving
RSL signals from the Channel. Negative polarity.
Serial Command Input. Pin used to read from and write
I VCMOS to the control registers. Also used for power manage-
ment.
I
RSL
Column bus. 5-bit bus containing control and address
information for column accesses.
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KMMR16R84(6/8/C/G)C
KMMR18R84(6/8/C/G)C
Preliminary
4/6/8/12/16d RIMMTM Module with 128Mb RDRAMs
4/6/8/12/16d RIMMTM Module with 144Mb RDRAMs
Signal
RCTM
Pins
A79
RCTMN A81
RDQA8.. A91, B91, A89, B89, A87, B87, A85,
RDQA0 B85, A83
RDQB8.. B61, A61, B63, A63, B65, A65, B67,
RDQB0 A67, B69
RROW2..
RROW0
RSCK
B77, A75, B75
A59
SA0
SA1
SA2
SCL
SDA
SIN
B53
B55
B57
A53
A55
B36
SOUT
A36
SVDD
SWP
VCMOS
Vdd
Vref
A56, B56
A57
A35, B35, A37, B37
A41, A42, A54, A58, B41, B42, B54,
B58
A51, B51
I/O Type Description
I
RSL
Clock to master. Interface clock used for transmitting
RSL signals to the Channel. Positive polarity.
I
RSL
Clock to master. Interface clock used for transmitting
RSL signals to the Channel. Negative polarity.
Data bus A. A 9-bit bus carrying a byte of read or write
I/O RSL data between the Channel and the RDRAM. RDQA8 is
non-functional on modules x16 RDRAM devices.
Data bus B. A 9-bit bus carrying a byte of read or write
I/O RSL data between the Channel and the RDRAM. RDQB8 is
non-functional on modules x16 RDRAM devices.
I
RSL
Row bus. 3-bit bus containing control and address infor-
mation for row accesses.
I
VCMOS
Serial Clock input. Clock source used to read from and
write to the RDRAM control registers.
I SVDD Serial Presence Detect Address 0.
I SVDD Serial Presence Detect Address 1.
I SVDD Serial Presence Detect Address 2.
I SVDD Serial Presence Detect Clock.
I/O SVDD Serial Presence Detect Data (Open Collector I/O).
Serial I/O for reading from and writing to the control
I/O VCMOS registers. Attaches to SIO0 of the first RDRAM on the
module.
Serial I/O for reading from and writing to the control
I/O VCMOS registers. Attaches to SIO1 of the last RDRAM on the
module.
SPD Voltage. Used for signals SCL, SDA, SWE, SA0,
SA1 and SA2.
I
SVDD
Serial Presence Detect Write Protect (active high). When
low, the SPD can be written as well as read.
CMOS I/O Voltage. Used for signals CMD, SCK, SIN,
SOUT.
Supply voltage for the RDRAM core and interface logic.
Logic threshold reference voltage for RSL signals.
Page 4
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KMMR16R84(6/8/C/G)C
KMMR18R84(6/8/C/G)C
Preliminary
4/6/8/12/16d RIMMTM Module with 128Mb RDRAMs
4/6/8/12/16d RIMMTM Module with 144Mb RDRAMs
SIO0
SIO1
SCK
CMD
Vref
SIO0
SIO1
SCK
CMD
Vref
SIO0
SIO1
SCK
CMD
Vref
SIO0
SIO1
SCK
CMD
Vref
U1
Direct RDRAM (128/144Mb)
U2
Direct RDRAM (128/144Mb)
U3
Direct RDRAM (128/144Mb)
UN
Direct RDRAM (128/144Mb)
Vdd
2 per
RDRAM
0.1µF
Gnd
VREF
1 per
2 RDRAMs
Plus one
Near Connector
0.1µF
Gnd
VCMOS
1 per
2 RDRAMs
0.1 µF
Gnd
Module
Capacity
N
256MB
192MB
128MB
96MB
64MB
16
12
8
6
4
Note 1. Rambus Channel signals form a loop through
the RIMM module, with the exception of the SIO chain.
Note 2. See Serial Presence Detection Specification for
information on the SPD device and its contents.
SVDD
SCL
SWP
47K
SA0
SA1
SA2
Serial Presence Detect
Vcc SVDD
SCL SDA
SDA
WP
U0A0 A1 A2
Gnd
0.1 µF
Figure 2: RIMM Module Functional Diagram
Page 5
Rev.0.9 Apr. 1999