Nortel Networks Circuit Card - Manual (Page 393)

NT6D80 MSDL card Page 393 of 906
Circuit Card Description and Installation
Figure 83
MSDL block diagram
Address Buffer and
Decoding Logic
Control and Data
Transceivers
Interface Registers
Micro Processing Unit
(68020 MPU)
MPU Address
Decoding Logic
Shared Resource
Arbitrator
Memory Address
Counter & Buffer
Shared Memory
Integrated Serial Communication Controllers
RS-232/422
Transceiver
Port 0 Port 1 Port 2 Port 3
RS-232
Transceiver
Parallel I/O
Controller
Monitor Port
Memory
DMA
Arbitrator
CPU Bus
Address Bus
Control Bus
Data Bus
MPU Bus
Address Bus
Control Bus
Data Bus
553-5432
RS-232/422
Transceiver
RS-232/422
Transceiver
RS-232/422
Transceiver