2 cpu base clock select (jp1), 3 switch settings (sw1), 4 external led header (j1) – Acrosser AR-B1320 User Manual
Page 24: Cpu base clock select (jp1) -4, Switch settings (sw1) -4, External led header (j1) -4
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3.2
CPU BASE CLOCK SELECT (JP1)
This board provides two types of CPU input clocks; they are 60MHz and 80MHz. The CPU input
clock is twice the operating clock.
CPU Input Clock
CPU Operating Clock
JP1 Setting
80MHz 40MHz
Short
1-2
66MHz 33MHz
Short
2-3
Table 3-2 CPU Clock Settings
Factory Preset
Figure 3-2 JP1: CPU Clock Select
3.3
SWITCH SETTINGS (SW1)
SW1 is a 6-SPST DIP switch. It provides multi-purpose selection in one switch. The following
table gives the details:
SW1
Function
When “OFF”
When “ON”
Factory Preset
Switch 1
Selects the base I/O address of SSD
210H-211H
290H-291H
Off
Switch 2
Selects the memory segment of SSD
C800H(8KB)
D800H(8KB)
Off
Switch 2 Selects the memory segment of DiskOnChip
(If Switch 3 is set as “ON”)
CA00H(8KB) DA00H(8KB)
Off
Switch 3
DiskOnChip select Disabled
Enabled
Off
Switch 4
Reserved
---
---
Off
Switch 5
COM-A port mode select RS-232C
RS-485
Off
Switch 6
COM-B port mode select RS-232C
RS-485
Off
Table 3-3 SW1 Settings
3.4
EXTERNAL LED HEADER (J1)
The J1 is a 4-pin right angle header. It allows you to connect an external power LED and an
external hard disk LED.
2
1
3
4
J1
Front View
1: Power LED+
3: Power LED-
2: Hard Disk LED+
4: Hard Disk LED-
Figure 3-3 J1: External LED Header
3-4