Memory¶

The GECKO4-Education platform contains SDRAM and serial flash memory as shown in the figure below.

SDRAM¶

The GECKO4-Education contains a 32MByte mobile synchronous DRAM (M-SDRAM). This SDRAM can be used with the QSYS external SDRAM memory controller. The tables below show the FPGA pins to which the SDRAM is connected. Here: sdram.tcl is an example tcl script that can be used for the pin assignment in Quartus.

Address bus

Pin assignment of the SDRAM address bus¶
Address bit	FPGA pin
0	PIN_N5
1	PIN_N6
2	PIN_P4
3	PIN_P5
4	PIN_W6
5	PIN_V7
6	PIN_V6

Pin assignment of the SDRAM address bus¶
Address bit	FPGA pin
7	PIN_V5
8	PIN_V1
9	PIN_V4
10	PIN_U2
11	PIN_U8
12	PIN_V2

Data bus

Pin assignment of the SDRAM data bus¶
Data bit	FPGA pin
0	PIN_M1
1	PIN_M2
2	PIN_M3
3	PIN_N1
4	PIN_N2
5	PIN_P1
6	PIN_P2
7	PIN_P3

Pin assignment of the SDRAM data bus¶
Data bit	FPGA pin
8	PIN_W1
9	PIN_W2
10	PIN_Y1
11	PIN_Y2
12	PIN_Y3
13	PIN_AA1
14	PIN_AB3
15	PIN_AA4

Control signals

Pin assignment of the SDRAM control signals¶
Function	Name	FPGA pin
Bank select low	BA[0]	PIN_M6
Bank select high	BA[1]	PIN_M7
Byte select low	DQM[0]	PIN_R1
Byte select high	DQM[1]	PIN_V3
Clock enable	CKE	PIN_U7
Clock	CLK	PIN_AA3
Column address select (active low)	nCAS	PIN_M5
Row address select (active low)	nRAS	PIN_M4
Chip select (active low)	nCS	PIN_U1
Write enable (active low)	nWE	PIN_R2

Flash¶

In addition to the FPGA configuration FLASH, the GECKO4-Education platform also contains an 8MByte serial FLASH memory. The tables below show the FPGA pins to which the Flash is connected. Here: flash.tcl is an example tcl script that can be used for the pin assignment in Quartus.

Pin assignment of the Flash¶
Function	Name	FGPA pin
Chip select (active low)	NCS	PIN_U14
Hold (active low) or IO3	NHOLD_IO3	PIN_U13
Serial clock	SCK	PIN_V13
Serial in or IO0	SI_IO0	PIN_W13
Serial out or IO1	SO_IO1	PIN_V14
Write protect (active low) or IO2	NWP_IO2	PIN_W14