Manuals
/
Brands
/
TV and Video
/
Home Theater Server
/
SMSC
/
TV and Video
/
Home Theater Server
SMSC
COM20020
FIGURE 7 - SEQUENTIAL ACCESS OPERATION
1
31
60
60
Download
60 pages, 272.65 Kb
31
Address Pointer Register
Low
2K x 8
RAM
11
Data Register
8
I/O Address 04H
I/O Address 03H
11-Bit Counter
Memory
Address Bus
Memory
Data Bus
D0-D7
High
I/O Address 02H
INTERNAL
FIGURE 7 - SEQUENTIAL ACCESS OPERATION
Contents
Main
COM20020 COM20020 ULANC
Universal Local Area Network Controller with 2K x 8 On-Board RAM
FEATURES
GENERAL DESCRIPTION
TABLE OF CONTENTS
D6
D5
D4
D3
PIN CONFIGURATION
nRESET IN VSS nTXEN
RXIN nPULSE2
AD1 VSS
Packages: 24-Pin DIP or 28-Pin PLCC Ordering Information: COM20020 P
DESCRIPTION OF PIN FUNCTIONS
Page
Page
FIGURE 1 - COM20020 OPERATION
PROTOCOL DESCRIPTION
Page
Page
Page
SYSTEM DESCRIPTION
XTAL1XTAL2
8051
FIGURE 2 - MULTIPLEXED, 8051-LIKE BUS INTERFACE WITH RS-485 INTERFACE
FIGURE A
COM20020
FIGURE B
+
FIGURE C
6801
FIGURE 3 - NON-MULTIPLEXED, 6801-LIKE BUS INTERFACE WITH RS-485 INTERFACE
COM20020
20MHz XTAL
Page
1 0
1
Page
FIGURE 6 - INTERNAL BLOCK DIAGRAM
FUNCTIONAL DESCRIPTION
Table 2 - Read Register Summary
Table 3 - Write Register Summary
Page
Page
Page
Page
Table 5 - Diagnostic Status Register
Table 6 - Command Register DATA COMMAND DESCRIPTION
Page
Table 9 - Configuration Register
Table 10 - Setup Register
FIGURE 7 - SEQUENTIAL ACCESS OPERATION
Page
Page
FIGURE 8 - RAM BUFFER PACKET CONFIGURATION
Page
Page
Page
Page
Page
Page
Page
Page
OPERATIONAL DESCRIPTION
Page
Page
TIMING DIAGRAMS
FIGURE 10 - MULTIPLEXED BUS, 68XX-LIKE CONTROL SIGNALS; READ CYCLE
Page
FIGURE 11 - MULTIPLEXED BUS, 68XX-LIKE CONTROL SIGNALS; WRITE CYCLE
FIGURE 11A - MULTIPLEXED BUS, 80XX-LIKE CONTROL SIGNALS; WRITE CYCLE
FIGURE 12 - NON-MULTIPLEXED BUS, 80XX-LIKE CONTROL SIGNALS; READ CYCLE
FIGURE 12A - NON-MULTIPLEXED BUS, 68XX-LIKE CONTROL SIGNALS; READ CYCLE
FIGURE 13 - NON-MULTIPLEXED BUS, 80XX-LIKE CONTROL SIGNALS; WRITE CYCLE
FIGURE 13A - NON-MULTIPLEXED BUS, 68XX-LIKE CONTROL SIGNALS; WRITE CYCLE
FIGURE 14 - NORMAL MODE TRANSMIT OR RECEIVE TIMING (These signals are to and from the hybrid)
Page
Page
FIGURE 18 - 28-PIN PLCC PACKAGE DIMENSIONS
FIGURE 18A - 24-PIN DIP PACKAGE DIMENSIONS
COM20020 ERRATA SHEET