Caen V2495, Руководство пользователя

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CAEN
Electronic Instrumentation
UM5175 – V2495/VX2495 User Manual rev. 1
41
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Expansion I/O ports : for each mezzanine, Tab. 10.4 shows the supported signals (X = D, E, F).
SIGNAL NAME WIDTH TYPE DESCRIPTION
IDx 3 Input Card ID
“000” = A395A
“001” = A395B
“010” = A395C
“011” = A395D
“100” = A395E
“111” = No mezzanine present
SELx 1 Output NIM/TTL selector
0 = NIM
1 = TTL
nOEx 1 Output Output enable (active low)
0 = output
1 = input
X 32 Input/Output Data bus to/from the mezzanines
Tab. 10.4: Expansion I/O ports description table
Please note that:
•
The SELx and nOEx signals are meaningful only for the A395D mezzanine card. When this mezzanine is not used,
these signals can be left undriven.
•
Mezzanines with 32 I/O signals have a one-to-one correspondence between physical signals and I/O pins (i.e.
X[i] corresponds to the i-th channel of the mezzanine).
In case the A395D mezzanine is used, the mapping between the external channels and the X bus is shown in
Tab. 10.5 . A schematic view of the A395D board is shown in Fig. 10.1 .
CHANNEL INPUT SIGNALS OUTPUT SIGNALS
0 X[2] X[0]
1 X[18] X[16]
2 X[3] X[1]
3 X[19] X[17]
4 X[14] X[12]
5 X[30] X[28]
6 X[15] X[13]
7 X[31] X[29]
Tab. 10.5: A395D mapping
Fig. 10.1: Simplified scheme related to Tab. 10.5.
For example:
•
A395D channel 0 can be driven with signal X[0] and its status can be read from X[2].
•
A395D channel 1 can be driven with signal X[16] and its status can be read from X[18].