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ASIC (Application Specific Integrated Circuit)
description
The ASIC used in Junior-1 has the following functions:
1. The ARM 610 (CPU) bus control (ARM bus glue logic)
2. Memory control
3. PCMCIA parallel /O bus
4. SCC control
Serial port control, Communication support with a Mackintosh
serial port, IR communication control
| . Power management system
. LCD display control
. Tablet control
. Sound generation
. . Clock function
* Power management
(Start) There are following three conditions for starting operations
from the standby state.
(1) 32.768KHz is oscillating.
(2) Batt-fault is HIGH.
(3) VCC-Fault turns HIGH within the specified time.
When the reset or ON-SW is inputted under the above condi-
tions, DC-ON becomes HIGH to start the convertor. When it
will not operate with the reset OK, check the above three
conditions.
(Stop) The system is normally stopped by the software. In case of
emergency, however, it is shut down by ASIC.
There are two conditions for the emergency shut down.
1, VCC-Fault is LOW.
2. Batt-Fault is LOW.
When either of the above two occurs, ASIC stops CLK to ARM
and fixes the data bus to LOW. To continue the operation
when the system retums rom the above conditions, ARM,
ASIC, RAM and ROM are connected to the backup system
©@enan
power source.
* Clock adjustment (Advance adjustment)
Advance adjustment
Used
jig/meter
Advance meter (Made by Sansei electronics, Model SS-406 + Fre-
quency divider)
Sensor (Contact-type)
Temperature
comcee
15°C
E
0.25
16°C
;
;
0.20
17°C
:
.
0.15
18°C
.
0.10
19°C
S
.
0.05
20 ~ 30°C
3
5
+0.00
(sec/day)
* Adjust according to the reference in the table.
PWB
Reset
1 eee measurement
f
GND
o0Q00
odo
x For the adjustment, use a screwdriver.
Adjustment in the set
Trimmer
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