Function Of Cpu; Memory - Furuno FS-1570 Service Manual

5.3.1 Function of CPU

Three CPUs, 32-bit MAIN CPU, 8-bit SUB CPU-1 (I/O) and 8-bit SUB CPU-2 (I/O)
work as shown in Table 5.3.1.
CPU
MAIN CPU
(U3, MB91101)
SUB CPU-1 (I/O)
(U8, M38881M2)
SUB CPU-2 (I/O)
(U15, M38881M2)

5.3.2 Memory

Table 5.3.2 shows the memory contents.
Memory
8 Mbit Flash ROM
(U4, MBM29F800TA)
256 kbit EEPROM
(U5, AT28C256)
1 Mbit SRAM
(U6 and U7, K6T1008C2E)
1) Communicates with SUB CPU-1, SUB CPU-2, FS-2570C, MIF
interface units and DMC
2) Encoding and decoding of DSC and NBDP messages
3) Decides the timing for NBDP communication
4) Interfaces with DSC DSP and NBDP DSP
5) Reads check signals
6) Controls external BK, antenna coupler and IC-302/IC-303-DSC
7) Receives NMEA signal
1) Communicates with Main CPU
2) Interfaces with Incoming Indicator, No.1 and No.2 FS-2570C
3) Detects the absence of W/R1 and W/R 2
1) Communicates with Main CPU
2) Interfaces with IEC61162 device, DMC-5, IC-302-DSC, NBDP
DSP and MIF devices
1) RT, DSC and NBDP programs
2) Default settings of DSC system setup menu
3) Default settings of RT system setup menu
4) ITU channels
1) Settings of DSC system setup menu
2) Settings of RT system setup menu
3) MMSI and model
4) User channels
5) Communication log
Used by MAIN CPU as working memory
5-12
5.3 T-CPU board (05P0732)
Table 5.3.1 Function of CPU
Function
Table 5.3.2 Memory contents
Contents