Intel PCI-7200 Manual do Utilizador descarregar pdf (Página 36)

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Operation Theorem

O_REQ & O_ACK for Digital Output

1. Digital Output Data is moved from PC memory to FIFO o f PCI-7200 by using

DMA data mastering data transfer.

2. Move output data from FIFO to digital output circuit.

3. Output data is ready.

4. An O_REQ signal is generated and sent to outside device.

5. After an O_ACK is got, the step 2 to step 5 will be repeated again.

** If the FIFO is not full, the output data is moved form PC‘s main memory to

FIFO automatically.

Move Data to

Digital Output FIFO

Bus mastering

DMA data Transfer

PC's Main

Memory

Digital Output DATA

Digital Output

O_REQ

O_ACK

Latch Digital Input

or Digital Output

Digital Input FIFO

Bus mastering

DMA data Transfer

PC's Main Memory

Digital Input DATA

IN_REQ

IN_ACK

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 64 65

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Intel PCI-7200 Manual do Utilizador Página 36