4.2 System Controller
4.2.1 Components of System Controller
a) CPU (IC401)
The CPU, with a 32bit internal bus, operates in sync with the 20MHz internal clock
that is generated from the 10MHz external clock.
The memory storage devices and the ports, including the 4Kbyte RAM, the 256Kbyte
ROM, the 18-bit address bus port, and the 16-bit external bus port, are built into
the CPU.
The following sections describe the features of these components.
DMA controller
Manages the DMA transfer of the data that are stored in the DRAM.
Interrupt controller
Receives and processes the external interrupts from the SCSI controller, the
system controller GA, the image process controller, the head controller, and the
SRAM (read/write), in addition to the internal interrupts.
Part 4: Technical Reference
BJ-W9000
4-48
System controller GA
J401
CPU
J403
J404
System controller PLD
SCSI controller
DRAM
SRAM
FLASH ROM
Line memory
EPROM
RTC
Battery
J406
J405
J408
J409
J407
J410
J411
J412
Dip SW
LED (LED572-LED578)
LED (LED401)
Button SW (SW571)
Button SW (SW402)
LED (LED571)
Figure 4-30 System Controller
Содержание BJ-W9000
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