8GB (x72, ECC, DR) 240-Pin DDR3 VLP RDIMM
Pin Descriptions
Table 5: Pin Descriptions (Continued)
Symbol
SDA
TDQSx,
TDQSx#
Type
I/O
Output
Description
Serial data:
Used to transfer addresses and data into and out of the temperature sen-
sor/SPD EEPROM on the I
2
C bus.
Redundant data strobe (x8 devices only):
TDQS is enabled/disabled via the LOAD
MODE command to the extended mode register (EMR). When TDQS is enabled, DM is
disabled and TDQS and TDQS# provide termination resistance; otherwise, TDQS# are
no function.
Err_Out#
EVENT#
V
DD
V
DDSPD
V
REFCA
V
REFDQ
V
SS
V
TT
NC
NF
Output
Parity error output:
Parity error found on the command and address bus.
(open drain)
Output
Temperature event:The
EVENT# pin is asserted by the temperature sensor when criti-
(open drain) cal temperature thresholds have been exceeded.
Supply
Supply
Supply
Supply
Supply
Supply
–
–
Power supply:
1.5V ±0.075V. The component V
DD
and V
DDQ
are connected to the
module V
DD
.
Temperature sensor/SPD EEPROM power supply:
3.0–3.6V.
Reference voltage:
Control, command, and address V
DD
/2.
Reference voltage:
DQ, DM V
DD
/2.
Ground.
Termination voltage:
Used for control, command, and address V
DD
/2.
No connect:
These pins are not connected on the module.
No function:
These pins are connected within the module, but provide no functional-
ity.
PDF: 09005aef8482a8a7
jdf18c1gx72pdz.pdf – Rev. D 12/12 EN
5
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