Cypress Semiconductor CY7C68013A Manual do Utilizador descarregar pdf (Página 4)

3.3 Digital Signal Processor TMS320VC33 circuit

Six Serial Port pins of the chip, VC33_RESET\, INT3\ and GND pins have been brought

out to common pin header. This is done to connect the circuit directly to the serial port of

the computer which then can be another window to the DSP for debugging. The

controller chip has the ability to reset the DSP. This is particularly useful as the DSP is

used in the micro-computer boot loader mode. The boot loading process begins with the

reset of the DSP followed by pulling one of the four INT 0,1,2,3 pins to select the boot

loading mode and address. This is achieved using the port A pin. The DSP can be reset

by the power supplying chip TPS768D318. Essential jumpers are used with the CLK

mode pins to enable the oscillator and select the frequency

4. Software

The software to use the DSP i.e. to issue command to the DSP and read and write to it is

X-windows based. At a lower level is the command line interpreter which then forwards

the data to the USB controller firmware. The controller firmware interprets the initial

bytes and takes a decision based on it. The rest of the bytes are forwarded to the DSP.

Figure 3: Flow diagram

4.1 Host side programs

The host side command line interpreter uses a series of predefined functions to carry out

any given command. These functions are based on libusb functions and create

interpretable instructions for the controller firmware.

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Cypress Semiconductor CY7C68013A Manual do Utilizador Página 4