PCI-1718 Series User Manual 76
C.18 FIFO Status — BASE+19H
The register at BASE+19H clears the FIFO buffer and sets its empty flag
(EF). The FIFO status register, address BASE+19H, has flags which you
can read to determine the current state of the FIFO buffer, including full
flag, half-full flag, and empty flag.
EF FIFO empty flag
1 FIFO is empty
0 FIFO is not empty
HF FIFO half-full flag
1 FIFO is half-full or more than half-full
0 FIFO is less than half-full
FF FIFO full flag
1 FIFO is full
0 FIFO is not full
C.19 FIFO Clear — BASE+19H
Writing any value to BASE+19H clears all data in the FIFO and sets the
empty flag (EF) to 1.
Table C.19: Register for FIFO Status
Read FIFO status
Bit # 76543210
BASE + 19H FF HF EF
Table C.20: Register for FIFO Clear
Write FIFO clear
Bit # 76543210
BASE + 19H XXXXXXXX