User`s guide

2.1 Configuration Jumpers
Table 2–1 (Cont.) Configuration Jumper Position Descriptions
Feature Jack/Jumper—Pins and Description
BC_SPEED<2:0> J1—17/18 (CONF7), —19/20 (CONF8), —21/22 (CONF9) (eb164.4)
These jumpers select the Bcache timing parameters used to
compute the BC_CONFIG register value. Select the jumper
configuration that matches the access time for the SRAMs being
used.
CONF7
Pins
17/18
CONF8
Pins
19/20
CONF9
Pins
21/22 Bcache Speed
In In In Reserved
In In Out 6-ns SRAM timing
In Out In 8-ns SRAM timing
In Out Out 10-ns SRAM timing (default)
Out In In 12-ns SRAM timing
Out In Out 15-ns SRAM timing
Out Out In Reserved
Out Out Out Reserved
Mini-Debugger J1—23/24 (CONF10) (eb164.4)
The Alpha SROM Mini-Debugger is provided in the SROM. This
jumper (In) causes the SROM initialization to trap to the Mini-
Debugger (connector J13) after all initialization is complete, but
before starting the execution of the system ROM code. The default
position for this jumper is out.
(continued on next page)
2–6 System Configuration and Connectors