PRELIMINARY DATA SHEET
MOS INTEGRATED CIRCUIT
MC-4R256CEE6B, 4R256CEE6C
Direct Rambus
TM
DRAM RIMM
TM
Module
256M-BYTE (128M-WORD x 16-BIT)
Description
The Direct Rambus RIMM module is a general-purpose high-performance memory module 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.
MC-4R256CEE6B, 4R256CEE6C modules consists of sixteen 128M Direct Rambus DRAM (Direct RDRAM™)
devices (
µ
PD488448). These are extremely high-speed CMOS DRAMs organized as 8M words by 16 bits. The use
of Rambus Signaling Level (RSL) technology permits 600MHz, 711MHz or 800MHz transfer rates while using
conventional system and board design technologies.
Direct RDRAM devices are capable of sustained data transfers at 1.25 ns per two bytes (10 ns per sixteen bytes).
The architecture of the Direct RDRAM 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 Direct RDRAM's 32 banks support up to four simultaneous transactions
per device.
Features
•
184 edge connector pads with 1mm pad spacing
•
256 MB Direct RDRAM storage
•
Each RDRAM
®
has 32 banks, for 512 banks total on module
•
Gold plated contacts
•
RDRAMs use Chip Scale Package (CSP)
•
Serial Presence Detect support
•
Operates from a 2.5 V supply
•
Low power and powerdown self refresh modes
•
Separate Row and Column buses for higher efficiency
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. M14541EJ1V1DS00 (1st edition)
Date Published November 1999 NS CP (K)
Printed in Japan
The mark
5
shows major revised points.
©
1999
MC-4R256CEE6B, 4R256CEE6C
Order information
Part number
Organization
I/O Freq.
MHz
MC-4R256CEE6B - 845
MC-4R256CEE6B - 745
MC-4R256CEE6B - 653
MC-4R256CEE6C - 845
MC-4R256CEE6C - 745
MC-4R256CEE6C - 653
128M x 16
800
711
600
800
711
600
RAS access time
ns
45
45
53
45
45
53
184 edge connector pads RIMM
with heat spreader
Edge connector : Gold plated
16 pieces of
Package
Mounted devices
µ
PD488448FB
FBGA (D BGA ) package
16 pieces of
2
TM
µ
PD488448FF
FBGA (
µ
BGA
®
) package
2
Preliminary Data Sheet M14541EJ1V1DS00
MC-4R256CEE6B, 4R256CEE6C
Module Pad Configuration
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B13
B14
B15
B16
B17
B18
B19
B20
B21
B22
B23
B24
B25
B26
B27
B28
B29
B30
B31
B32
B33
B34
B35
B36
B37
B38
B39
B40
B41
B42
B43
B44
B45
B46
GND
LDQA7
GND
LDQA5
GND
LDQA3
GND
LDQA1
GND
LCFM
GND
LCFMN
GND
NC
GND
LROW2
GND
LROW0
GND
LCOL3
GND
LCOL1
GND
LDQB0
GND
LDQB2
GND
LDQB4
GND
LDQB6
GND
LDQB8
GND
LCMD
V
CMOS
SIN
V
CMOS
NC
GND
NC
V
DD
V
DD
NC
NC
NC
NC
GND
LDQA8
GND
LDQA6
GND
LDQA4
GND
LDQA2
GND
LDQA0
GND
LCTMN
GND
LCTM
GND
NC
GND
LROW1
GND
LCOL4
GND
LCOL2
GND
LCOL0
GND
LDQB1
GND
LDQB3
GND
LDQB5
GND
LDQB7
GND
LSCK
V
CMOS
SOUT
V
CMOS
NC
GND
NC
V
DD
V
DD
NC
NC
NC
NC
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
A25
A26
A27
A28
A29
A30
A31
A32
A33
A34
A35
A36
A37
A38
A39
A40
A41
A42
A43
A44
A45
A46
Side B
Side A
LCFM, LCFMN,
RCFM, RCFMN : Clock from master
LCTM, LCTMN,
RCTM, RCTMN : Clock to master
LCMD, RCMD
: Serial Command Pad
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
NC
NC
NC
NC
V
REF
GND
SA0
V
DD
SA1
SV
DD
SA2
V
DD
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
NC
NC
NC
NC
V
REF
GND
SCL
V
DD
SDA
SV
DD
SWP
V
DD
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
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
LROW2 - LROW0,
RROW2 - RROW0 : Row bus
LCOL4 - LCOL0,
RCOL4 - RCOL0
LDQA8 - LDQA0,
RDQA8 - RDQA0
LDQB8 - LDQB0,
RDQB8 - RDQB0
SA0 - SA2
SCL, SDA
SIN, SOUT
SV
DD
SWP
V
CMOS
V
DD
V
REF
GND
NC
: Data bus B
LSCK, RSCK : Clock input
: Serial Presence Detect Address
: Serial Presence Detect Clock
: Serial I/O
: SPD Voltage
: Serial Presence Detect Write Protect
: Supply voltage for serial pads
: Supply voltage
: Logic threshold
: Ground reference
: These pads are not connected
: Data bus A
: Column bus
Preliminary Data Sheet M14541EJ1V1DS00
3
MC-4R256CEE6B, 4R256CEE6C
Module Pad Names
Pad
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
A25
A26
A27
A28
A29
A30
A31
A32
A33
A34
A35
A36
A37
A38
A39
A40
A41
A42
A43
A44
A45
A46
Signal Name
GND
LDQA8
GND
LDQA6
GND
LDQA4
GND
LDQA2
GND
LDQA0
GND
LCTMN
GND
LCTM
GND
NC
GND
LROW1
GND
LCOL4
GND
LCOL2
GND
LCOL0
GND
LDQB1
GND
LDQB3
GND
LDQB5
GND
LDQB7
GND
LSCK
V
CMOS
SOUT
V
CMOS
NC
GND
NC
V
DD
V
DD
NC
NC
NC
NC
Pad
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B13
B14
B15
B16
B17
B18
B19
B20
B21
B22
B23
B24
B25
B26
B27
B28
B29
B30
B31
B32
B33
B34
B35
B36
B37
B38
B39
B40
B41
B42
B43
B44
B45
B46
Signal Name
GND
LDQA7
GND
LDQA5
GND
LDQA3
GND
LDQA1
GND
LCFM
GND
LCFMN
GND
NC
GND
LROW2
GND
LROW0
GND
LCOL3
GND
LCOL1
GND
LDQB0
GND
LDQB2
GND
LDQB4
GND
LDQB6
GND
LDQB8
GND
LCMD
V
CMOS
SIN
V
CMOS
NC
GND
NC
V
DD
V
DD
NC
NC
NC
NC
Pad
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
Signal Name
NC
NC
NC
NC
V
REF
GND
SCL
V
DD
SDA
SV
DD
SWP
V
DD
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
Pad
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
Signal Name
NC
NC
NC
NC
V
REF
GND
SA0
V
DD
SA1
SV
DD
SA2
V
DD
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
4
Preliminary Data Sheet M14541EJ1V1DS00
MC-4R256CEE6B, 4R256CEE6C
Module Connector Pad Description
Signal
GND
LCFM
I/O
—
I
Type
—
RSL
Description
Ground reference for RDRAM core and interface. 72 PCB connector pads.
Clock from master. Interface clock used for receiving RSL signals from the
Channel. Positive polarity.
LCFMN
I
RSL
Clock from master. Interface clock used for receiving RSL signals from the
Channel. Negative polarity.
LCMD
I
V
CMOS
Serial Command used to read from and write to the control registers. Also used
for power management.
LCOL4..LCOL0
I
RSL
Column bus. 5-bit bus containing control and address information for column
accesses.
LCTM
I
RSL
Clock to master. Interface clock used for transmitting RSL signals to the
Channel. Positive polarity.
LCTMN
I
RSL
Clock to master. Interface clock used for transmitting RSL signals to the
Channel. Negative polarity.
LDQA8..LDQA0
I/O
RSL
Data bus A. A 9-bit bus carrying a byte of read or write data between the Channel
and the RDRAM. LDQA8 is non-functional on modules with x16 RDRAM devices.
LDQB8..LDQB0
I/O
RSL
Data bus B. A 9-bit bus carrying a byte of read or write data between the Channel
and the RDRAM. LDQB8 is non-functional on modules with x16 RDRAM devices.
LROW2..LROW0
LSCK
I
I
RSL
V
CMOS
Row bus. 3-bit bus containing control and address information for row accesses.
Serial clock input. Clock source used to read from and write to the RDRAM
control registers.
NC
—
—
These pads are not connected. These 24 connector pads are reserved for future
use.
RCFM
RCFMN
RCMD
RCOL4..RCOL0
RCTM
RCTMN
RDQA8..RDQA0
I
I
I
I
I
I
I/O
RSL
RSL
V
CMOS
RSL
RSL
RSL
RSL
Clock from master. Interface clock used for receiving RSL signals from the
Channel. Positive polarity.
Clock from master. Interface clock used for receiving RSL signals from the
Channel. Negative polarity.
Serial Command Input used to read from and write to the control registers. Also
used for power management.
Column bus. 5-bit bus containing control and address information for column
accesses.
Clock to master. Interface clock used for transmitting RSL signals to the
Channel. Positive polarity.
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 data between the Channel
and the RDRAM. RDQA8 is non-functional on modules with x16 RDRAM
devices.
RDQB8..RDQB0
I/O
RSL
Data bus B. A 9-bit bus carrying a byte of read or write data between the Channel
and the RDRAM. RDQB8 is non-functional on modules with x16 RDRAM
devices.
RROW2..RROW0
I
RSL
Row bus. 3-bit bus containing control and address information for row accesses.
(1/2)
Preliminary Data Sheet M14541EJ1V1DS00
5
