General Purpose Outputs (GPOUT)
The Cyton-CXP
CYT-9-8
BitFlow, Inc.
Version A.0
9.5 General Purpose Outputs (GPOUT)
9.5.1 Introduction
The General Purpose Outputs (GPOUT) are used to control external hardware (e.g.
strobes, stages, etc.). Each GPOUT has a pin on the I/O connector. The level on this
pin can be controlled either statically via a GPOUT register, or dynamically via one of
the on-board signal generators.
There are three different electrical types of GPOUTs: TTL, Differential (LVDS) and
Open Collector. Each type is described in more detail below. See the IO connector
pin-out tables to determine which signals are on which pins.
Not every frame grabber family has the same number and type of GPOUTs. The spec-
ifications for each family are described later in this section.
9.5.2 GPOUT Source Options (CL Only)
The source for each GPOUT bit is controlled by the corresponding GPOUTx_CON bit-
field. These are located in CON8. The source for each GPOUT can be programmed
independently of the others. Table 9-1 shows the sources for each GPOUT.
9.5.3 R64 GPOUT Configuration
The R64 and R64e model boards have seven general purpose outputs. The electrical
characteristic of these outputs is shown in the following list.
GPOUT0, GPOUT1, GPOUT2 - Differential (LVDS) outputs
Table 9-1 GPOUTx_CON
GPOUTx_CON
GPOUTx Source
0 (000b)
GPOUTx bit
1 (001b)
CT3 from CTAB
2 (010b)
CT2 from CTAB
3 (011b)
CT1 from CTAB
4 (100b)
CT0 from CTAB
5 (101b)
Internally generated clock. Frequency set
by CFREQ.
6 (110b)
Free running on board signal generator.
Controlled by FREE_RUN_RATE and FREE_
RUN_HIGH
7 (111b)
Reserved
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