Preliminary
Acquisition and Camera Control
The Control Tables (CTABs)
Version F.0
BitFlow, Inc.
KBN-2-11
Logic for generating INC_V - the increment control signal to the VCOUNT.
Logic for generating LOAD_V - the load control signal to the VCOUNT. When
LOAD_V is asserted, VCOUNT is loaded with the value of 8000h (32,768 in
decimal).
Logic for generating RESET_V - the reset control signal to the VCOUNT. When
RESET_V is asserted, VCOUNT is reset to 0.
Logic for generating CLOCK_V - the clock to the VCOUNT.
VCTAB - a static memory (SRAM) that outputs eight VCTAB control signals. The
address of this SRAM is driven by VCOUNT.
If RESET_V and LOAD_V are asserted simultaneous, RESET_V overrides.
As the VCOUNT increments, it scans the addresses of the VCTAB in ascending order.
The output of the VCTAB depends on the data that has been written in the VCTAB by
the host. If the VCOUNT is free running, it will cyclically scan all the VCTAB’s
addresses. Any arbitrary cyclic waveform can be implemented by programming the
VCTAB with the adequate data.
The LOAD_V and RESET_V will enable the synchronization between external events
and the waveforms generated by the VCTAB. LOAD_V and RESET_V will force the
VCOUNT to known values, 8000h and 0 respectively.
The INC_V signal will allow for stopping the counter from incrementing. In that case,
the output of the VCTAB will be constant. While the VCOUNT is not incrementing, it
can still be loaded or reset, see the logic below.
2.5.2 The VCTAB Functions
The functions assigned to the columns in the VCTAB are shown in Table 2-2.
VSTART defines the start of the Vertical Acquisition Window (VAW), if the start is pro-
vided by the VCTAB, see previous section.
Table 2-2 The VCTAB Functions
Bit
Name
Function
0
VSTART
Start of VAW
1
VRESET
Vertical Reset
2
ENVLOAD
FEN Mask, enable load
3
IRQ
CTAB Interrupt
4
GPV0
General purpose vertical function 0
5
GPV1
General purpose vertical function 1
6
GPV2
General purpose vertical function 2
7
GPV3
General purpose vertical function 3
Summary of Contents for KBN-CL4-2.51-SP
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