Sbus-To-External Bus Interface; Figure B-4 Macio Asic Functional Block Diagram - Sun Microsystems SPARCstation 20 Service Manual

MACIO ASIC
DMA
MACIO ASIC Functional Block Diagram
FIGURE B-4

SBus-to-External Bus Interface

The SBus-to-external bus interface (SEC) ASIC provides the interface between the
SBus and the external bus. The external bus connects to the following:
Serial port chips (2)
Audio chip
Diskette drive controller
4-Mbit EEPROM
NVRAM/TOD chip
LED interface
One of the serial port chips provides serial ports A and B. The second serial port
chip provides the keyboard and mouse port. Line drivers interface the two serial
port chips to the serial ports.
SEC ASIC.
LANCE
Fast
SCSI
controller
illustrates a functional block diagram of the
FIGURE B-5
Clock
chip
SCSI
Parallel
port
Appendix B Functional Description
TPE
AUI
Parallel
port
SBus
203