9
3.0
FUNCTIONAL DESCRIPTION
3.1
GENERAL
The EM405-8 provides a mechanical and electrical interface between an Ethernet bus and up to
eight M-Modules. It utilizes an embedded microcontroller to provide buffering and command
translation between the Ethernet interface and the M-Modules. A simplified functional block
diagram is shown in Figure 5.
Figure 5. Functional Block Diagram
3.1.1
Embedded Controller
The embedded controller is implemented using a high-performance microprocessor module. The
microcontroller executes system firmware that controls the translation between Ethernet and the
M-Module interface. The system firmware implements a simple command protocol that allows
access to the M-Modules I/O space, trigger mapping and carrier information and status.
ETHERNET
EMBEDDED
CONTROLLER
M-MODULE
INTERFACE
DC/DC
CONV
85-265VAC IN
PO
SI
T
IO
N
7
M-MODULE 7
TTL
TRIGGERS
OR
+48VDC
10/100 BASE-
T
PO
SI
T
IO
N
6
M-MODULE 6
PO
SI
T
IO
N
5
M-MODULE 5
PO
SI
T
IO
N
4
M-MODULE 4
PO
SI
T
IO
N
3
M-MODULE 3
PO
SI
T
IO
N
2
M-MODULE 2
PO
SI
T
ION
1
M-MODULE 1
PO
SI
T
IO
N
0
M-MODULE 0
AC/DC
CONV
PCI TO LOCAL
BUS BRIDGE
TRIGGER
CONTROL
LVDS
XCVR
-0001 VERSION ONLY
LVDS
TRIGGERS
C&H Technologies, Inc. <> 445 Round Rock West Drive <> Round Rock, Texas 78681 <> www.chtech.com