Cypress Semiconductor FX2LP Información técnica Pagina 44

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EZ-USB FX2 Technical Reference Manual
Page 1-18 EZ-USB FX2 Technical Reference Manual v2.1
In the “Slave FIFO” mode, external logic or an external processor interfaces directly to the FX2
endpoint FIFOs. In this mode, the GPIF is not active, since external logic has direct FIFO control.
Therefore, the basic FIFO signals (flags, selectors, strobes) are brought out on FX2 pins. The
external master can be asynchronous or synchronous, and it may supply its own independent
clock to the FX2 interface.
The 100-pin package includes all the functionality of the 56-pin package, and brings out the two
additional I/O ports PORTC and PORTE as well as all the USART, Timer, Interrupt, and GPIF sig-
nals. The RD
and WR pins function as PORTC strobes in the 100-pin package, and as expansion
memory strobes in the 128-pin package.
The 128-pin package adds 28 pins to the 100-pin package to bring out the full 8051 expansion
memory bus. This allows for the connection of external memory for applications that run at power-
on and before connection to USB. The 128-pin package also provides the foundation for the
Cypress FX2 Development Kit boards, in which code is developed using a debug monitor that
runs in external RAM.
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