101-1279 Rabbit Semiconductor, 101-1279 Datasheet - Page 32

• Manufacturer Part Number: 101-1279
• Description: PLASTIC ENCLOSURE FOR BL4S100
• Manufacturer: Rabbit Semiconductor

Specifications of 101-1279

• Accessory Type: Enclosure
• Product: Prototyping Accessories
• Processor Type: BL4S100
• Board Size: 146 mm x 96 mm x 16 mm
• Interface Type: Ethernet
• For Use With/related Products: BL4S100
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Other names: 316-1159

3.5 USB Programming Cable
The USB programming cable is used to connect the serial programming port of the
BL4S100 to a PC USB port. The programming cable converts the voltage levels used by
the PC USB port to the CMOS voltage levels used by the Rabbit microprocessor.
When the
connector on the programming cable is connected to the programming
PROG
header on the BL4S100, programs can be downloaded and debugged over the serial interface.
The
connector of the programming cable may be used on the programming header on
DIAG
the BL4S100 with the BL4S100 operating in the Run Mode. This allows the programming
port to be used as a regular serial port.
3.5.1 Changing Between Program Mode and Run Mode
The BL4S100 is automatically in Program Mode when the
PROG
connector on the pro-
gramming cable is attached, and is automatically in Run Mode when reset with no program-
ming cable is attached or the
connector is attached. When the Rabbit microprocessor
DIAG
is reset, the operating mode is determined by the status of the SMODE pins. When the pro-
gramming cable’s
connector is attached, the SMODE pins are pulled high, placing
PROG
the Rabbit microprocessor in the Program Mode. When the programming cable’s
PROG
connector is not attached, the SMODE0 pin is pulled low and the SMODE1 pin is high so
that the Rabbit 4000 powers up in the clocked serial bootstrap mode to load the program
from the serial flash when the BL4S100 is operating in the Run Mode.
Figure 13. BL4S100 Program Mode and Run Mode Setup
A program “runs” in either mode, but can only be downloaded and debugged when the
BL4S100 is in the Program Mode.
Refer to the
for more information on the pro-
Rabbit 4000 Microprocessor User’s Manual
gramming port and the programming cable.
BL4S100 User’s Manual
30