AX309 vs. EasyFPGA

Memory Chip on ...	AX309 Xilinx Spartan-6 Development Board	easyFPGA Spartan-6 Development Board
Manufacturer	Hynix	Winbond
Part	H57V2562GTR-75C	W9864G6JH-6
Type	SDRAM	SDRAM
Value	4M x 4Bank x 16 Bits	1M x 4Banks x 16 Bits
Clock	133MHz	166 MHz
Pins	54	54
Voltage	3.3V	3.3V
Interface	LVTTL	LVTTL
Access Time	6ns	6ns

SDR SDRAM

This type of SDRAM is slower than the DDR variants, because only one word of data is transmitted per clock cycle (single data rate).

Typical SDR SDRAM clock rates are 66, 100, and 133 MHz (periods of 15, 10, and 7.5 ns). Clock rates up to 200 MHz were available.