User`s manual

2.1 Configuration Jumpers
Table 2–1 Jumper Position Descriptions
Select Bit
Register Bit
Name Function
sp_bit7 BOOT_OPTION Jumper out—Boot first image in flash ROM.
Jumper in (default)—Boot one of several alternate
images in flash ROM as specified by NVRAM
location 3F in TOY RAM. See Section 4.4.
sp_bit6 MINI_DEBUG Jumper out (default)—Boot selected image in
flash ROM.
Jumper in—Trap to SROM debug port (J2).
sp_bit<5:3> BC_SPEED<2:0> L2 cache speed selection is shown here.
BC_SPEED
<2> <1> <0>
J3-21 J3-19 J3-17 L2 Cache Period
In
1
In In Reserved
In In Out
2
6ns
In Out In 8 ns
In Out Out 10 ns
Out In In 12 ns (default for
21A02–A3 and 21A02–A4)
Out In Out 15 ns (default for
21A02–A5)
Out Out In Reserved
Out Out Out Reserved
1
Jumper in (logical 0)
2
Jumper out (logical 1)
(continued on next page)
2–4 System Jumpers and Connectors