Peritek VCD-V, User Manual

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Peritek
4-14 Theory of Operation
Table 4-2 VCT, VCU, VCD Unique PLD Device Summary
Part Device
Number Type Description
VCTUV19 MACH210 Used for VCT and VCU. Zoom control register. Provides
ICS1562 3-wire control interface. Provides programmable
polarity for HSYNC and VSYNC. Supports external
sync/genlock function. Controls blanking, VRAM shift
clocks, and VCLK. VCT version includes support for
interlaced cursors.
VCTU9 MACH210 Used for VRAM block write operation. Takes the two low
order 34020 low address lines and CAS lines and recodes
them according to the VCT or VCU memory architecture to
correctly select up to four pixels in a VRAM for
simultaneous writing from the VRAM color register.
Table 4-3 VCD Unique PLD Device Summary
Part Device
Number Type Description
VCDV19 MACH230 Used for VCD. Zoom control register. Provides GAL
(crystal clock) and ICS1562 3-wire control interface.
Provides programmable polarity for HSYNC and VSYNC.
Supports external sync/genlock function. Controls
blanking, VRAM shift clocks, and VCLK. Includes support
for interlaced cursors. Contains multiplexer and latches for
DLUT output for 1, 4, and 8 bit/pixel digital output.
VCDV5 MACH130 Pixel multiplexer. Latches 4 pixels (32 primary and 16
overlay data bits) and pipes the pixels out one at a time to
the SRAM and BT482. Latches six 34020 multiplexed
address (RCA) lines and presents a 12-bit address to the
SRAM for read/write by the 34020 or VMEbus host CPU.