Rev. 0.95 / J uly.01
5
RIMM
Module
with 256/288Mb RDRAMs Preliminary
TM
Module Connector Pads
I/O
Signal
Type
Description
B59
RCMD
Serial Command Input used to read from and write
to the control registers. Also used for power
management.
I
V
CMOS
A73, B73, A71, B71, A69
I
RCOL4..
RCOL0
RSL
Column bus. 5-bit bus containing control and
address information for column accesses.
A41, A42, A54, A58, B41, B42, B54,
B58
I
Vdd
Supply voltage for the RDRAM core and interface
logic.
A79
I
RCTM
RSL
Clock to master. Interface clock used for transmit-
ting RSL signals to the Channel. Positive polarity.
A81
I
RCTMN
RSL
Clock to master. Interface clock used for transmit-
ting RSL signals to the Channel. Negative polarity.
A91, B91, A89, B89, A87, B87, A85,
B85, A83
I/O
RDQA8..
RDQA0
RSL
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 x16 RDRAM devices.
B61, A61, B63, A63, B65, A65, B67,
A67, B69
I/O
RDQB8..
RDQB0
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 x16 RDRAM devices.
B77, A75, B75
I
RROW2..
RROW0
RSL
Row bus. 3-bit bus containing control and address
information for row accesses.
A59
I
RSCK
V
CMOS
Serial Clock input. Clock source used to read from
and write to the RDRAM control registers.
B53
I
SA0
SV
DD
Serial Presence Detect Address 0.
B55
I
SA1
SV
DD
Serial Presence Detect Address 1.
B57
I
SA2
SV
DD
Serial Presence Detect Address 2.
A53
I
SCL
SV
DD
Serial Presence Detect Clock.
A55
I/O
SDA
SV
DD
Serial Presence Detect Data (Open Collector I/O)
B36
I/O
SIN
V
CMOS
Serial I/O for reading from and writing to the control
registers. Attaches to SIO0 of the first RDRAM on
the module.
A36
I/O
SOUT
V
CMOS
Serial I/O for reading from and writing to the control
registers. Attaches to SIO1 of the last RDRAM on
the module.
A56, B56
SV
DD
SPD Voltage. Used for signals SCL, SDA, SWE,
SA0, SA1 and SA2.
A57
I
SWP
SV
DD
Serial Presence Detect Write Protect (active high).
When low, the SPD can be written as well as read.
A35, B35, A37, B37
V
CMOS
CMOS I/O Voltage. Used for signals CMD, SCK,
SIN, SOUT.
A51, B51
Vref
Logic threshold reference voltage for RSL signals.