DE2-70 User Manual

SSRAM

2-Mbyte standard synchronous SRAM

Organized as 512K x 36 bits

Accessible as memory for the Nios II processor and by the DE2-70 Control Panel

SDRAM

Two 32-Mbyte Single Data Rate Synchronous Dynamic RAM memory chips

Organized as 4M x 16 bits x 4 banks

Accessible as memory for the Nios II processor and by the DE2-70 Control Panel

Flash memory

8-Mbyte NOR Flash memory

Support both byte and word mode access

Accessible as memory for the Nios II processor and by the DE2-70 Control Panel

SD card socket

Provides SPI and 1-bit SD mode for SD Card access

Accessible as memory for the Nios II processor with the DE2-70 SD Card Driver

Pushbutton switches

4 pushbutton switches

Debounced by a Schmitt trigger circuit

Normally high; generates one active-low pulse when the switch is pressed

Toggle switches

18 toggle switches for user inputs

A switch causes logic 0 when in the DOWN (closest to the edge of the DE2-70 board) position and logic 1 when in the UP position

Clock inputs

50-MHz oscillator

28.63-MHz oscillator

SMA external clock input

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Sigma DE2-70 manual Ssram