Hynix HMT451U7AFR8C-PBT0 User Manual
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Rev. 1.1 / Jul. 2013
7
DQS0–DQS8
DQS0–DQS8
DQS0–DQS8
SSTL
Differential
crossing
Data strobe for input and output data.
SA0–SA2
—
These signals are tied at the system planar to either V
SS
or V
DDSPD
to con-
figure the serial SPD EEPROM address range.
SDA
—
This bidirectional pin is used to transfer data into or out of the SPD
EEPROM. An external resistor may be connected from the SDA bus line to
V
EEPROM. An external resistor may be connected from the SDA bus line to
V
DDSPD
to act as a pullup on the system board.
SCL
—
This signal is used to clock data into and out of the SPD EEPROM. An
external resistor may be connected from the SCL bus time to V
external resistor may be connected from the SCL bus time to V
DDSPD
to act
as a pullup on the system board.
V
DDSPD
Supply
Power supply for SPD EEPROM. This supply is separate from the V
DD
/V
DD
Q
power plane. EEPROM supply is operable from 3.0V to 3.6V.
Symbol
Type
Polarity
Function