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Acquisition and Camera Control
The Control Tables (CTABs)
Version G.5
BitFlow, Inc.
NEO-2-15
Vertical Stick
Using the previous example, assume that after we asserted the sync signal to the cam-
era, we expect the camera to give us a frame, i.e., assert FEN. While we expect the
camera to assert FEN, VCOUNT is still being incremented. If it takes too long for the
camera to respond, VCOUNT will eventually reach and pass beyond 8000h. A vertical
acquisition window will be asserted, even though the camera did not assert FEN. To
avoid such a situation, just before address 8000h, when VCOUNT reaches 7FF0h, it
will stop. It will stay at 7FF0h until FEN is asserted. Then, VCOUNT will be loaded with
8000h.
The Vertical Stick will occur according to the setting of VCNT_RLS_STK.
The LOAD_V Control
LOAD_V is the logic of loading VCOUNT. In other words, loading VCOUNT means it
jump to a new address.
VCOUNT will be loaded with the value 8000h by the rising/falling edge of FEN, if
ENVLOAD is asserted. FEN usually marks the start of a valid frame. The start of the ver-
tical acquisition window can be placed starting at address 8000h.
ENVLOAD is a column in the VCTAB. There are cameras that do not assert FEN. Some
other type of cameras assert only the start and stop of a frame. In this case, ENVLOAD
can mask out the unwanted signals.
Operation on the rising/falling edge of FEN is selected by FENPOL, see CON14
The RESET_V Control
RESET_V is the logic of resetting VCOUNT.
VCOUNT can be reset from different sources, under different conditions. The reset-
ting of the VCOUNT is controlled by the VCNT_RST bitfield.
2.5.3 Vertical Control Table Size
The Vertical Control Table has 20000h (131,972) entries.
2.5.4 Horizontal Control Table
The Horizontal Control Table (HCTAB) is 8 bits wide. The function of each bit is show
in the following table.
Figure 2-7 depicts the structure of the HCTAB. For clarity, the address and data path
that allow the host to program the HCTAB are not shown
Содержание NEO-PCE-CLB
Страница 8: ... TOC 6 BitFlow Inc Version ...
Страница 22: ...Virtual vs Hardware Frame Grabbers The Neon NEO 1 12 BitFlow Inc Version G 5 ...
Страница 64: ...NTG Control Registers The Neon NEO 3 6 BitFlow Inc Version G 5 ...
Страница 90: ...PoCL Control Registers The Neon NEO 6 6 BitFlow Inc Version G 5 ...
Страница 266: ...Power Consumption The Neon NEO 12 6 BitFlow Inc Version G 5 ...
Страница 294: ...NEO PCE DIF I O Connector Pinout P3 The Neon NEO 13 28 BitFlow Inc Version G 5 ...
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