Achronix Speedster22i HD1000 Development Kit User Guide - Manual (Page 40)

40 UG034, July 1, 2014
Controller Interfaces
The Atmel Atmega2560 (U35) controller has the following interfaces for performing several
tasks on the development board.

Serial interface to the USB port for communications with the development PC

SD card for uploading bitstreams to the HD1000

SPI for SFLASH memory control

Header for configuration

HD1000 for configuration
These interfaces are shown in Figure 11. Table 12 shows the relevant pins and their
connections.
Table 12: ACX-BRD-HD1000-100G Microcontroller Interfaces and their Connections
Microcontroller – Atmega2560 (U35) Connection
Interface Pin Name Pin Interface Signal Name Pin
SD PA1/AD1 77 Micro-SD Socket SD_CLK 5
PA2/AD2 76 SD_DAT3 2
PA3/AD3 75 SD_DAT2 1
PA4/AD4 74 SD_DAT1 8
PA5/AD5 73 SD_DAT0 7
PA6/AD6 72 SD_CMD 3
SPI SCK/PCINT1/PB1 20 Header (J20) AVR_SCK 1
MISO/PCINT3/PB3 22 AVR_PDO 3
MOSI/PCINT2/PB2 21 AVR_PDI 9
SS_N/PCINT0/PB0 19 AVR_SS 6
Header PF4/ADC4/TCK 93 Header (J43) AVR_TCK 1
PF5/ADC5/TMS 92 AVR_TMS 5
PF6/ADC6/TDO 91 AVR_TDO 3
PF7/ADC7/TDI 90 AVR_TDI 9
Memory Interfaces
The board has five off-chip memory interfaces in addition to the removable SD and the
SFLASH.

One 204-pin SO-DIMM socket (4 GB)

One DDR3 device (2 Gb)

Two RLDRAM3 devices (2 x 16 Mbx36)

One QDR2+ device (72 Mb)
Figure 11 shows the off-chip memory interfaces for the HD1000.
SO-DIMM Socket (J41)
You can use a standard 204-pin DDR3 SO-DIMM (up to 4 GB, 2133 MHz) in the socket (J41)
on the board. HD1000 drives the memory signals using dedicated GPIOs. Achronix provides