PolarFire SoC Board Design Recommendations

The GPIO and HSIO of PolarFire SoC devices support various memory interfaces.

The following table lists the various types of memories supported in PolarFire SoC devices.

Table 1. DDR3 and DDR4 Parameters
Parameter DDR3 LPDDR3 DDR3L DDR4 LPDDR4
VDDIO 1.5 V 1.2 V 1.35 1.2V To be updated
VTT, VREF 0.75V 0.6V 0.675V 0.6V To be updated
Clock, Address, and Command (CAC) Layout Daisy Chained 
(Fly-by) Point to point Daisy Chained

(Fly-by)

Daisy Chained (Fly-by) To be updated
Data Strobe Differential Differential Differential Differential To be updated
ODT Dynamic Dynamic Dynamic Dynamic To be updated
Match Addr/CMD/Ctrl to Clock Tightly Yes Yes Yes Yes To be updated
Match DQ/DM/DQS Tightly Yes Yes Yes Yes To be updated
Match DQS to Clock Loosely Not Required Not Required Not Required Not Required To be updated
I/O Standard SSTL_15 HSUL-12 SSTL_135 POD-12* To be updated
RZQ 240_1% 240_1% 240_1% 240_1% To be updated

* HSTL_12 IO standard is used for DDR4 address, command, and control signals.

For more information on DDR memories, see the following documents: