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Input/output selector (is2_top)
Each connector is connected to one of the following.
• DC input/output circuit board
• Differential input/output circuit board
• Analog input/output circuit board
The connector determines the circuit board based on the connected module type (IOB0_UNIT, IOB1_UNIT, IOB2_UNIT,
IOE_UNIT).
The input/output selector uses the determined module type information to connect to the following function blocks and to
output signals to the user circuit block via each function block.
• Digital input control part
• Digital output control part
• Digital input/output control part
• Analog input control part
• Analog output control part
DC I/O circuit board
Differential I/O
circuit board
Analog I/O
circuit board
*1 IOB1_UNIT, IOB2_UNIT, and IOE_UNIT have the same structure.
■Function List
A list of input/output selector functions is shown below.
Item
I/O terminal switching
*1 : Indicates 0, 1, 2.
■Decoding result
The decoding result for each module type is shown below. Depending on each decoding result, the connection destination
block in FPGA operates effectively.
• Main module connection circuit board
IOB0 to 2_UNIT[3:0]
0001b
0010b
• Extension module connection circuit board
IOE_UNIT[4:0]
0_0001b
0_0010b
0_0011b
0_1111b
11 FPGA INTERNAL CIRCUIT
194
11.3 Standard Circuit
Input/output
signal
Connector
Installation
*1
Operation
Module type signals (IOB_UNIT[3:0], IOE_UNIT[4:0]) are used as the basis for I/O terminal switching and FPGA
*1
internal connection.
Connector (E0)
DC input/output circuit board
Differential input/output circuit board
Analog input/output circuit board
No connection circuit board
FPGA
I/O selector
Digital input control part
Digital output control part
Route
selection
Digital I/O control part
Analog input control part
Analog output control part
Connection circuit board
DC input/output circuit board
Differential input/output circuit board
Connector (E1)
DC input/output circuit board
Differential input/output circuit board
Analog input/output circuit board
No connection circuit board
User circuit part
Connector (E2)
DC input/output circuit board
Differential input/output circuit board
Analog input/output circuit board
No connection circuit board
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Troubleshooting
