Memory Circuit Control - Fujitsu ULTIMA90 Maintenance Manual

For peripheral LSI, ROM
Chip select
DRAM control
Sensor input
The MB91110 is a printer controller that has 32-bit RISC FR30 as the core element and the peripheral circuits required
for printer control as shown in Figure 5.3.6.
The controller features the following:
Minimum instruction execution time -> 20ns (at 50 MHz machine cycle)
Using a high-level language (C) to support multitasking
Enhanced interrupt function (eight priority levels)
Automatic data transfer function independent of the CPU
Device using 144-pin flat package CMOS technology

5.3.2.2 Memory Circuit Control

Figure 5.3.7 is a memory circuit control block diagram.
F R30 core
UART
Chip select
Address decoder
DRAM control
I/O port
Figure 5.3.6 MB91110 internal block diagram
External interrupt
Control Noise
resistant external
interrupt
16- bit timer
8 8 data
converter
10- bit
A/D converter
8 ch
External bus
147
INPRM,EXPRM
Reception
For head control
Kanji low column data
Conversion
+40 V detection
Print head temperature
Detection
Data bus