2.1 Configuration Jumpers
Table 2–1 (Cont.) Configuration Jumper Position Descriptions
Feature
Jack/Jumper—Pins and Description
BOOT_OPTION
J1—25/26 (CONF11)
This jumper selects the image to be loaded into memory from
the system flash ROM. With the jumper out (bit = 1), the first
image (debug monitor) is loaded. With the jumper in (bit = 0),
alternate images can be loaded depending upon the value stored in
TOY RAM location 0x3F. The default position for this jumper is in.
For system flash ROMs that contain a single image, the header is
optional. If the header does not exist, the entire 1MB system flash
ROM is loaded and executed at physical address zero.
For more information on the system ROM header and boot images,
refer to Section 4.5.1.
BC_RD_FAST
J1—29/30 (CONF13)
This jumper forces a Bcache read speed setting of 1 cycle faster
than nominal.
BC_RD_FAST
Bcache Speed
In
Make read speed 1 cycle faster
Out
Nominal read speed (default)
Flash ROM write-
protect/write-
enable jumper
J14
Jumper Pins
Function
1 to 2
Flash ROM write-protect
2 to 3
Flash ROM write-enable (default)
System Configuration and Connectors 2–7