Furuno FS-1570, Service Manual

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5.7 C-CPU Board (05P0729)/C-IF Board (05P0730)
5-43
5.7.1 C-CPU Board (05P0729)
1. CPU
32 bit Main CPU and 8 bit CPU locate on C-CPU board.
Table 5.7.1 C-CPU
MAIN CPU
(U3, MB91101)
SUB CPU
(U10, M38881M2)
Gate Array
(U9, LZ9GF18)
Heart of the control unit
Used to expand serial ports of
Main CPU
(For NBDP and T-CPU
connection)
Controls key input, display
and brilliance.
2. Memory
Table 5.7.2 lists the memories on C-CPU board.
Table 5.7.2 Memories
8 Mbit Flash ROM
(U4, MBM29F800TA) 256 kbit EEPROM
(U5, AT28C256) 1 Mbit SRAM
(U6 and U7, K6T1008C2E)
FS-2570C program is
stored.
Backup of contrast/dimmer, and
AF/RF volume and SQ settings
Used by C-CPU as working
memory
3. LED
CR1 and CR2 are not used. These are normally on.
4. NMI SW
Not used.