The each DNCC node type has the uniform host
computer core (Fig. 2) including network communication
section and a different specific hardware unit based on the
target node function. The uniform hardware core
facilitates implementation of system software including
communication services. Fast multi-channel DMA
controller, vectored interrupt controller and timers are
integrated inside the core. Q1 bus utilizes fast (1 Mbps)
NBP UARTs on both communication sides. UARTs have
no hardware frame address detection so the address
detection has to be implemented in software. The efficient
multichannel DMA controller organizes virtual dual-port
RAM area between CPU and UART [11]. The DMA
controller cycle is not shadow type (no CPU bus cycle
delay) it uses cycle stealing but it is very fast.