UPD77015GC NEC, UPD77015GC Datasheet - Page 20

• Manufacturer Part Number: UPD77015GC
• Description: 16 bits/ Fixed-point Digital Signal Processor
• Manufacturer: NEC

20
2.4.1 Instruction RAM Outline
A system vector area is assigned to 64 words of the instruction RAM. Internal instruction RAM is initialized and
rewritten by boot program.
FFFFH
4FFFH
3FFFH
02FFH
01FFH
00FFH
5000H
4000H
0300H
0240H
023FH
0200H
0100H
0000H
The PD77015 has an instruction ROM (4K words
The PD77017 has an instruction ROM (12K words
The PD77018 has an instruction ROM (24K words
Boot up ROM contains the program loading instruction code to internal instruction RAM.
Caution
Bootup ROM (256 words)
System (15.25K words)
Internal Instruction RAM
Internal Instruction ROM
System (44K words)
System (256 words)
When any data is accessed or stored to system address, normal operation of the device is
not assured.
Vector (64 words)
PD77015
(256 words)
(4K words)
6FFFH
7000H
Bootup ROM (256 words)
Internal Instruction ROM
Internal Instruction RAM
System (15.25K words)
System (36K words)
System (256 words)
Vector (64 words)
PD77017
(12K words)
(256 words)
32 bits) and instruction RAM( 256 words
32 bits) and instruction RAM( 256 words
32 bits) and instruction RAM( 256 words
A000H
9FFFH
PD77015, 77017, 77018
Bootup ROM (256 words)
Internal Instruction ROM
Internal Instruction RAM
System (15.25K words)
System (24K words)
System (256 words)
Vector (64 words)
(24K words)
PD77018
(256 words)
32 bits).
32 bits).
32 bits).