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Evaluation Kit Hardware
4.2
4.2.1
Computer Module (CM)
CM Board Overview
The CM board is the CPU module at the heart of the system. It connects to the EK board through a SO-
DIMM200 interface. It carries the processor and external memories. The CM board serves as a minimal
CPU sub-system. All five processors:SAM9G15, SAM9G25, SAM9X25,SAM9G35 and SAM9X35 share
the same CM circuitry with minor configuration settings.
Note:
There are three CM boards from three different manufacturers. The five processors are
implemented as shown in Table 4-2 below:
Table 4-2. CM Board Implementation
Manufacturer &
Module kind
SAM9G15-CM
SAM9G25-CM
SAM9G35-CM
SAM9X25-CM
SAM9X35-CM
mfg 1
x
x
mfg 2
x
x
mfg 3
x
x
x
x
x
The three CM boards share the same circuitry design but with different designator information and PCB layouts. The
circuitry reference in this guide, for common design parts, refers to schematics from SAM9G25-CM (mfg 3). All the
other schematics are provided in Section 4.2.6 ”Schematics” .
Figure 4-1.
Board Architecture
4.2.2
Equipment List
The CM board is built around the integration of an ARM926-based microcontroller (BGA217 package)
with external memory and optional Ethernet PHYsical Layer Transceiver.
Evaluation Kit (EK) User Guide
4-3
11115A–ATARM–27-Jul-11
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