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H A R D W A R E
power net. In a DDR2 interface, these signals are driven using the SSTL18_DCI drive standard.
There are some exceptions, listed below.
DIMM_SDA, DIMM_SCL, DIMM_CK2
These signals are connected to a 2.5V clock bank on the FPGA. DIMM_SDA and
DIMM_SCL should be driven using the LVCMOS25 standard. For details on the DIMM_C2
signal, see the clocking section below.
The DIMM interfaces are not designed for hot-plug.
16.1.2
Changing the DIMM voltage
If you need to change the voltage of the DIMM interface, there is a set of jumper points
provided for each interface allowing power to be redirected from a source other than the on-
board 1.8V power supply. When the DN9002K10PCI is shipped, a jumper is installed
connecting the DIMM/FPGA Bank power to the 1.8V power rail. Next to each of these
jumpers is a 2.5V test point suitable for jumper-ing to the DIMM power rail, if necessary. Some
Dini Group products (DNSODM_SDR, DNSODM_DDR1) require this jumper to be
installed. When installing this jumper, remove the 1.8V jumper to prevent shorting 1.8 and 2.5V
supplies together.
+2.5V
TP12
+1.8V_B
+1.8V
TP13
For example, to change the DIMMD interface to 2.5V, remove the jumper installed in TP12
and install a jumper from TP12.2 to TP13.1
16.2
Clocking
The data signals in the DDR2 interface are clocked source-synchronously. In order to clock in
and out the “DQ” data signals, the DQS signal is used as a clock using the Virtex-5 “BUFIO”
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