DIMM Connector Pin Description:
Pin Name
Pin Description
Count
SCK
System Clock Input, positive line1
1
SCK
System Clock Input, negative line1
1
PN[13:0]
Primary Northbound Data, positive lines
14
PN[13:0]
Primary Northbound Data, negative lines
14
PS[9:0]
Primary Southbound Data, positive lines
10
PS[9:0]
Primary Southbound Data, negative lines
10
SN[13:0]
Secondary Northbound Data, positive lines
14
SN[13:0]
Secondary Northbound Data, negative lines
14
SS[9:0]
Secondary Southbound Data, positive lines
10
SS[9:0]
Secondary Southbound Data, negative lines
10
SCL
Serial Presence Detect (SPD) Clock Input
1
SDA
SPD Data Input / Output
1
SA[2:0]
SPD Address Inputs, also used to select the DIMM number in the AMB
3
VID[1:0]
Voltage ID: These pins must be unconnected for DDR2-based Fully Buffered DIMMs
VID[0] is VDD value: OPEN = 1.8 V, GND = 1.5 V; VID[1] is VCC value: OPEN = 1.5 V, GND = 1.2 V
2
RESET
AMB reset signal
1
RFU
Reserved for Future Use2
16
VCC
AMB Core Power and AMB Channel Interface Power (1.5 Volt)
8
VDD
DRAM Power and AMB DRAM I/O Power (1.8 Volt)
24
VTT
DRAM Address/Command/Clock Termination Power (V DD/2)
4
VDDSPD
SPD Power
1
VSS
Ground
80
DNU/M_Test
The DNU/M_Test pin provides an external connection on R/Cs A-D for testing
the margin of Vref which is produced by a voltage divider on the module. It
is not intended to be used in normal system operation and must not be
connected (DNU) in a system. This test pin may have other features on future card designs
and if it does, will be included in this specification at that time.
1
1
Total
240
1. System Clock Signals SCK and SCK switch at one half the DRAM CK/CK frequency
2. Eight pins reserved for forwarded clocks, eight pins reserved for future architecture flexibility
VALUERAM0502-001.A00
Page 3
TECHNOLOGY
Absolute Maximum Ratings
095
°C
AMB device operating temperature (Ambient)
0110
°C
Symbol
Parameter
MIN
MAX
Units
VIN
, VOUT Voltage on any pin relative to V SS
-0.3
1.75
V
VCC
Voltage on V CCpin relative to V SS
-0.3
1.75
V
VDD
Voltage V DD pin relative to Vss
-0.5
2.3
V
VTT
Voltage on V TT pin relative to V SS
-0.5
2.3
V
TSTG
Storage temperature
-55
100
°C
TCASE
DDR2 SDRAM device operating temperature (Ambient)
Note: (1) Above 85°C DRAM case temperature the Auto-Refresh command interval has to be reduced to tREFI = 3.9 µs.
95 (1)
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