I/O Control Blocks

Every I/O line is controlled through one I/O control block. There a 3 types of control block depending on the input / output capabilities of the I/O line:

In the above figures:

□ A thin blue line represents one individual electrical signal path
□ A thick blue line represents a collection of electrical signal paths
□ The blue arrowhead shows the propagation direction of the electrical signal(s)
□ A blue shape represents a functional element of the I/O control block
□ An orange (oval) shape represents a GenApi feature; the text inside being the feature name
□ An [x] appended to the feature name indicates that the feature is associated with a selector feature (in this case: LineSelector)
□ The orange arrowhead indicates the access-mode of the feature: read-only features having incoming arrows, writable features having an outgoing arrow.

Input-only and bidirectional I/O lines share a common input path structure including:

□ The I/O port block representing the I/O pins on the I/O connector(s)
□ The Rx block representing the line receiver circuit
□ The Input Inverter block representing the user-configurable logic inverter
□ The Input Filter block representing the user-configurable glitch-removal filter

Output-only and bidirectional I/O lines share a common output path structure including:

□ The I/O port block representing the I/O pins on the I/O connector(s)
□ The Tx block representing the line driver circuit
□ The Output Inverter block representing the user-configurable logic inverter
□ The Line Output Mux block representing the user-configurable source multiplexer