Intel LPCI-7200S manual ‹ IREQ Polarity Selection, ‹ FIFO Control and Status cPCI-7200 only

T1_T2: Timer 1 is cascaded with timer 2

1:Timer 1 and timer 2 are cascaded together; output of timer 2 connects to the clock input of timer 1.

0:Not cascaded, the 4MHz clock is connected to the timer 1 clock input.

‹I_REQ Polarity Selection:

When the input sampling is controlled by the I_REQ signal only, the I_REQ can be programmed to be rising edge active or falling edge active.

REQ_NEG: I_REQ trigger polarity

1:latch input data on falling edge of I_REQ

0:latch input data on rising edge of I_REQ

‹FIFO Control and Status (cPCI-7200 only):

The cPCI-7200 has an extra 2k samples digital input FIFO. The FIFO can be cleared and monitored by the following bits:

FIFORST (Write only): Clear the on-board DI FIFO

1:Write 1 to clear the data of the FIFO.

0:No operation.

FIFOEF (Read only): Empty flag of the DI FIFO 1: DI FIFO is empty.

0: DI FIFO is not empty.

FIFOFF (Read only): Full flag of the DI FIFO 1: DI FIFO is full.

0: DI FIFO is not full.

Note: The cPCI-7200 has 2 cascaded DI FIFOs. One is located in the PCI controller chip, the other one is on the PCI-7200 board. The above bits only control the on-board FIFO. In order to control the on-chip FIFO, please refer to the AMCC-5933 data book.

26 • Register Format