Artesyn ATCA 7370 / ATCA 7370-S Installation and Use (June 2014) - Manual (Page 138)

Maps and Registers
ATCA-7370/ATCA-7370-S Installation and Use (6806800P54F) 138
6.2.5.5 FIFO Control Register (FCR)
FCR is a write-only register that is located at the same address as the IIR (IIR is a read-only
register). FCR enables/disables the transmitter/receiver FIFOs, clears the transmitter/receiver
FIFOs, and sets the receiver FIFO trigger level.
FIFO mode: Transmit FIFO has
half or less than half data. Reading the IIR Register (if
the source of the interrupt) or
writing to the Transmitter
FIFO.
0b0000 4 Modem
Status Clear to Send, Data Set Ready,
Ring Indicator, Received Line
Signal Detect Reading the modem status
register
Table 6-33 Interrupt Identification Register Decode (continued)
Interrupt
ID
Interrupt Set/Reset Function
3:0 Priority Type Source Reset Control
Table 6-34 FIFO Control Register (FCR)
LPC IO Address: Base + 2
Bit Description Default Access
0 FIFO enable/disable:
1: Transmitter and Receiver FIFO enabled
0: FIFO disabled 0 LPC: w
1 Receiver FIFO reset:
1: Bytes in receiver FIFO and counter are
reset. Shift register is not reset (bit is self-
clearing)
0: No effect 0 LPC: w
2 Transmit FIFO reset:
1: Bytes in receiver FIFO and counter are
reset. Shift register is not reset (bit is self-
clearing)
0: No effect 0 LPC: w
3 Receiver/Transmitter ready. Not supported. 0 LPC: w