The Control Tables (CTABs)
The Neon
NEO-2-12
BitFlow, Inc.
Version G.5
2.5 The Control Tables (CTABs)
The CTABs are two memories that are programmed by the host computer and read
by the board’s acquisition circuitry. The read-out is done in a sequential fashion, i.e.
the memories’ addresses are scanned sequentially. There is a vertical memory
(VCTAB) and a horizontal memory (HCTAB). The vertical and horizontal memory each
has an associated counter which scans its addresses, VCOUNT and HCOUNT respec-
tively. The concept here is similar to how a CPU runs a program. There is a PC which
works it’s way through memory, processing each instruction in turn. Each bit in the
CTAB corresponds to a different operation. For example, one bit might control the
level of a signal going to the camera. In this case the CTABs can be thought of as pro-
grammable waveform generators. Another bit might cause an interrupt to occur on
the PCI bus, yet another bit might force the HCOUNT to go to zero. The CTABs are
fully programmable by software. The details of the CTABs are described in this sec-
tion.
2.5.1 Vertical Control Table
Figure 2-6 depicts the structure of the Vertical Control Table (VCTAB). For clarity, the
address and data path that allow the host to program the VCTAB are not shown.
Figure 2-6 Vertical Control Table
The Vertical Control Table is made up of the following blocks:
17
INCREMENT
LOGIC
LOAD
LOGIC
RESET
LOGIC
RESET_V
LOAD_V
INC_V
ADDRESS
VCOUNT (COUNTER)
VCTAB (SRAM)
VCOUNT
CLOCK_V
VSTART
VRESET
ENVLOAD
IRQ
GPV0
GPV1
GPV2
GPV3
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Содержание NEO-PCE-CLB
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