Sigma DE2-70 Ssram, Sdram, Flash memory, SD card socket, Pushbutton switches, Toggle switches

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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