Nortel Networks 553-3001-211 manual Msdl block diagram, Dma

NT6D80 MSDL card Page 381 of 894

Figure 80

MSDL block diagram

CPU Bus						Address Bus
						Control Bus
						Data Bus
	Address Buffer and			Control and Data
	Decoding Logic			Transceivers
	Shared Resource			Interface Registers
	Arbitrator
	MPU Address		Memory Address		Shared Memory
	Decoding Logic		Counter & Buffer
	Micro Processing Unit
	Memory		(68020 MPU)
MPU Bus						Address Bus
						Control Bus
						Data Bus
DMA	Parallel I/O		Integrated Serial Communication Controllers
Arbitrator	Controller
	RS-232	RS-232/422		RS-232/422 RS-232/422 RS-232/422
	Transceiver	Transceiver		Transceiver	Transceiver	Transceiver
	Monitor Port		Port 0	Port 1	Port 2	Port 3
						553-5432

Circuit Card Description and Installation