Epson DFX-9000 - Page 86

Epson DFX-9000 Revision B
Operating Principles Circuit operation 79
Table 2-7. Major IC elements
SoC ASIC
The SoC (System on Chip) ASIC is a one-chip custom gate array,
consisting of a 32-bit RISC CPU, associated standard peripheral control
circuits, and custom circuits specific to the control and operation of a
dot-matrix printer.
The peripheral control circuits on the ASIC include a Bus control unit, a
DMA controller, an Interrupt controller, a Timer, a Serial I/F, an A/D
convertor, and 8 KB of RAM.
Figure 2-23. SoC ASIC internal block diagram
Location Name Function (summary)
LSI1 SiX55513
(SoC ASIC)
ASIC coupled with CPU
 Memory control
 I/O Control (External I/F ports)
IC1 MBM29LV160 Flash memory (16 MB)
IC3 MSM51V18165F D-RAM (16 MB)
IC9 74VHC161284MTD IEEE-1284 Bi-directional
communication control IC
IC11 MAX3243 Serial port driver IC
LSI2 MB87L5090 Mechanism Control ASIC (printer
mechanism controller)
REG1 SI-3033C 3.3V on-board regulator
TA1 to
TA9
SDH02 Head driver
HIC1 SLA7025 LF motor driver
HIC2,
HIC3
A3953SLB RF motor driver
TA10 STA485A OC motor driver
TA11 STA485A HCPP motor driver
TA12 STA485A ATPC motor driver
IC18
LB11820M
SP motor driver