User`s manual

2.1 Configuration Jumpers
2.1.2 Hardware Configuration Jumpers
Hardware configuration jumpers are shown in Figure 2–1 and are described in
Table 2–2.
Table 2–2 AlphaPC64 Board Jumpers
Connector Pins Description
L2 Cache Address Lines
J15 4 Adr<22:19> L2 cache
J15-1
Adr19
J15-2
Adr20
J15-3
Adr21
J15-4
Adr22 Size
Out
2
Out Out Out 512KB (default for
21A02–A5)
In
1
Out Out Out 1MB
In In Out Out 2MB (default for
21A02–A3 and
21A02–A4)
In In In Out 4MB
In In In In 8MB
Flash ROM
J16 3 Flash ROM update enable/disable connector.
Jumper from pin 1 to pin 2 disables flash ROM update.
Jumper from pin 2 to pin 3 enables flash ROM update
(default).
1
Jumper in (logical 0)
2
Jumper out (logical 1)
(continued on next page)
2–6 System Jumpers and Connectors