Справочник Пользователя для National Instruments NI SPEEDY-33

© National Instruments Corporation

There are two types of available memory on the NI SPEEDY-33, on-chip 
memory and flash memory.

The DSP uses on-chip memory for algorithms because of its fast speed. 
There are 136 KB of on-chip RAM that the DSP can access with zero wait 
states. This memory is used for both program and data space.

The NI SPEEDY-33 includes flash memory that allows the device to be 
programmed and run in standalone mode without connection to a PC. This 
is essential for producing actual products or self-standing prototypes. Refer 
to the 

 section for information on configuring the jumper 

to enable flash memory boot up for standalone mode.

The flash memory is byte-wide and organized as 512 K 

× 8, with the DSP 

mapping it to a 512 K

× 32 (2,048 KB) area, only able to read the lowest 

byte (upper 24 bits are not read by or written to the DSP). Refer to the 

 section for information on jumper configurations for 

enabling or disabling flash memory write protection.

For a diagram of port locations on the NI SPEEDY-33, refer to Figure 2-1.

The PC USB port (J8) connects the NI SPEEDY-33 (target) to a PC (host) 
with a standard USB cable. The NI SPEEDY-33 functions as a full-speed 
USB device when connected to the PC host. The PC USB port is a Type B 
USB port (peripheral USB port) and conforms to USB Specification 1.1. 
When the NI SPEEDY-33 is connected to the PC, the USB port supplies 
power to the device, eliminating the need for the power port (J10), as 
described in the 

 section. When power is supplied to the device, 

the power LED lights.