RPi compute module

[VojislavM]

Main processor is the Raspberry Pi Computer module. It uses 200 Pin SODIMM connector for connecting to the board.

This board will be compatible with Raspberry Pi CM1 and CM3. It will not support CM3/Lite. CM1:

• BCM2835 System on Chip (SoC) processor
• Single Core 32bit, 700Mhz
• ARM11 with ARMv6 Instruction Set
• 512MByte LPDDR2 RAM
• 4GBytes eMMC

CM3:

• BCM2837 System on Chip (SoC) processor
• Quad Core 64bit, 1.2Ghz
• 512KByte L2 Cache
• ARM Cortex A53 with ARMv7 Instruction Set
• 1GByte LPDDR2 RAM
• 4GBytes eMMC

Due to the CM3 using the BCM2837, this means that consideration needs to be made for power consumption and heat dissipation.

• 2000mW for CM1, 3500mW for CM3/3L*

Mechanical Specification

The Compute Modules conform to JEDEC MO-224 mechanical specification for 200 pin DDR2 (1.8V) SODIMM modules (with the exception that the CM3, CM3L modules are 31mm in height rather than 30mm of CM1) and therefore should work with the many DDR2 SODIMM sockets available on the market.

[VojislavM]

Specifics in design:

GPIO:

• GPIO0 - SDA0/ used for camera module
• GPIO1 - SCL0/ used for camera module
• GPIO2 - SDA/1 used for SFP module
• GPIO3 - SCL1/ used for SFP module
• GPIO4 - /CAM1_GPIO used for camera module
• GPIO5 - /CAM1_CKL used for camera module
• GPIO6 - /HUB_nRESET used for HUB
• GPIO7 - /SFP_PRESENT
• GPIO14 - TXD0/used for move driver
• GPIO15 - RXD0/used for move driver
• GPIO16 - CTS0/SFP_LOS used for SFP module
• GPIO18 - /RST used for move driver, reset and firmware upgrade
• GPIO28, GPIO29, GPIO44 and GPIO45 are pulled down

Camera:

• pins 147 and 149, 153 and 155, 159 and 161, which are differential pairs used for camera, need to have 100 Ohm differential pair impedance.
• pins 165 and 167, which are differential pair used for USB connection to the HUB, need to have 90 Ohm differential pair impedance.

Power:

• VDAC is connected to the 3.3V

[VojislavM]

add support for CM3 Lite, see #27