BitFlow Cyton-CXP, Справочник по аппаратуре

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General Purpose Inputs (GPIN) The Cyton-CXP
CYT-9-6 BitFlow, Inc. Version A.0
9.4 General Purpose Inputs (GPIN)
9.4.1 Introduction
General Purpose Inputs (GPIN) are use to relay the state of an external signal onto the
board and ultimately make it available to a software program. In other words, if an
external signal connected to a GPIN pin is electrically high, then an associated regis-
ter will read back one, if the same signal is low, then the bit will read back zero.
There are two different type of GPIN input pins, TTL and differential (LVDS). For each
GPIN pin, there is an associated GPIN register. See the pin-out in the mechanical
chapter to determine the actual pins each signal resides on.
Each frame grabber family has a slightly different arrangement of GPIN signals. These
are enumerated in the following sections.
9.4.2 R64 GPIN Configuration
The R64 has five general purpose inputs. The signal level on each input can be read
on the corresponding GPIN bit. The electrical characteristic of these inputs is shown in
the following list.
GPIN0, GPIN1 - Single ended TTL level inputs
GPIN2, GPIN3, GPIN4 - Differential (LVDS) inputs
9.4.3 Neon-CL GPIN Configuration
The Neon-CL has three general purpose inputs. They are as follows:
GPIN0, GPIN1 - Single ended TTL level inputs
GPIN2 - Differential (LVDS) inputs
Note: GPIN3 and GPIN4 are not available on the Neon-CL
9.4.4 Karbon-CL GPIN Configuration
The Karbon-CL has five general purpose inputs. They are only available for reading on
VFG0. This means that even though all VFG’s have the bit GPIN0 to GPIN4, these will
only read back correctly on the first VFG (i.e. VFG0). The configuration of GPIN signals
is as follows;
GPIN0, GPIN1 - Single ended TTL level inputs
GPIN2, GPIN3, GPIN4 - Differential (LVDS) inputs