| DDR Clock Reference Board General Specifications |
Frequency
 | 100 mhz , 133mhz |
Data Rate
| 200mhz , 266mhz |
Support
| PC1600 and PC 2100 DDR module (Registered and Unbuffered) |
Connector
| 184 pin Standard DIMM connector |
Power Supply Options
| 3.3Volts: VDD for frequency synthesizer and buffer chips
3.3Volts: VDD for DIMM socket (or tie directly to first 3.3 Volt supply)
2.5Volts: VDDQ for frequency synthesize |
Two Clock Reference Nets
| 184 pin DDR Unbuffered DIMM Clock net
184 Pin DDR Registered DIMM Clock net |
Selectable Modes
| Clocks On/Off
Spread Spectrum Enable / Disable
100 Mhz / 133 Mhz Frequency Selection
PLL On / Off |
Card Size
| 7.9" x 3.725" x 0.05 |
| Associated Test Equipment Required for DDR Clock Ref Board |
2 Power Supplies
| 3.3 Volts (use 2 single or 1 dual power supply)
2.5 Volts |
Oscilloscope recommended characteristics
| Sampling Rate (real time) - Minimum of 4 Gsamples/second
RMS Jitter - < 6ps +/- 0.05% of delay setting |
Probes recommended characteristics
| Rise time -<140ps
Bandwidth (-3dB) > 2.5GHz
Input Resistance - 100k
Input Capacitance - 0.6pF |
| PC133/100 Clock Reference Board General Specifications |
Frequency
| 100 Mhz and 133Mhz Operation |
Support
| PC100 / PC133 SDRAM DIMM Module (Registered) |
Connector
| 168pin Standard DIMM connector |
Power Supply Option
| 3.3Volts: VDD for frequency synthesizer and buffer chips
3.3Volts: VDD for DIMM socket (or tie directly to first 3.3 Volt supply)
2.5Volts: VDDQ for frequency synthesizer |
Three Clock Reference Nets
| 168 Pin PC100 Unbuffered DIMM clock net
168 Pin PC100/PC133 Registered DIMM clock net
Clock buffer standard test load |
168 Pin standard DIMM connector
| 4 clocks wired (supports Registered or Unbuffered DIMMs)
CKE, CS pins tied inactive, other 'registered' DIMM inputs tied low |
Selectable Modes
| Clocks on/off
Spread spectrum enable/disable
100MHz/133MHz frequency selection |
Physical
| Card Size: 7.9" x 3.725" x .05"
Coupons for measuring board impedance |
Associated Test Equipment Required
| Bench triple outlet power supply or 3 seperated power supply for : 3.3Vdc, 3.3Vdc, 2.5Vdc
High Frequency Digital Oscilloscope:
- 1Ghz bandwidth minimum
- 2 each high impedance scope probes (0.5-1pf) |
