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SB16C1054PCI_Data Sheet_EN

ManualsBrandsSystemBase ManualsElectronic ComponentsPCI to Quad UART with 256 Byte FIFO Bridge Controller - 60pcs Bundle
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SB16C1054PCI
PCI Target Interface Controller
with Quad-UART
JULY 2013 REV 1.04
38
data in RX FIFO is same as the value of FLR.
The value of FLR is determined by FIFO mode. If FCR[7:6] is 00b, 01, 10 , and 11b,
FUR is 8, 16, 56, and 60, respectively. And if FCR[5:4] is 00b, 01b, 10b, and 11b, FLR is
0, 8, 16, and 56, respectively in 64-byte FIFO. In 256-byte FIFO mode, users can input
values in FUR and FLR as they want and use them. But the value in FUR must be larger
than that of FLR. While TX software flow control is active, its status (if Xon or Xoff) can be
verified by FSR[4]. If FSR[4] is 0b, the status is Xon and if 1b, the status is Xoff. It can be
verified by FSR[4] only. And for there is no condition to generate interrupt, interrupt
doesn’t occur. It is different from that interrupt is generated by IER[5] when RX software
flow control is enabled.
Table 12–1: Software flow control options (EFR[3:0])
EFR[3]
EFR[2]
EFR[1]
EFR[0]
TX, RX software flow controls
0
0
X
X
No transmit control
1
0
X
X
Transmit Xon1/Xoff1
0
1
X
X
Transmit Xon2/Xoff2
1
1
X
X
Transmit Xon1, Xon2/Xoff1, Xoff2
X
X
0
0
No receive flow control
X
X
1
0
Receiver compares Xon1/Xoff1
X
X
0
1
Receiver compares Xon2/Xoff2
X
X
1
1
Receiver compares Xon1, Xon2/Xoff1, Xoff2
0
0
0
0
No transmit control, No receive flow control
0
0
1
0
No transmit control, Receiver compares Xon1/Xoff1
0
0
0
1
No transmit control, Receiver compares Xon2/Xoff2
0
0
1
1
No transmit control, Receiver compares Xon1, Xon2/Xoff1, Xoff2
1
0
0
0
Transmit Xon1/Xoff1, No receive flow control
1
0
1
0
Transmit Xon1/Xoff1, Receiver compares Xon1/Xoff1
1
0
0
1
Transmit Xon1/Xoff1, Receiver compares Xon2/Xoff2
1
0
1
1
Transmit Xon1/Xoff1, Receiver compares Xon1, Xon2/Xoff1, Xoff2
0
1
0
0
Transmit Xon2/Xoff2, No receive flow control
0
1
1
0
Transmit Xon2/Xoff2, Receiver compares Xon1/Xoff1
0
1
0
1
Transmit Xon2/Xoff2, Receiver compares Xon2/Xoff2
0
1
1
1
Transmit Xon2/Xoff2, Receiver compares Xon1, Xon2/Xoff1, Xoff2
1
1
0
0
Transmit Xon2/Xoff2, No receive flow control
1
1
1
0
Transmit Xon2/Xoff2, Xoff2, Receiver compares Xon1/Xoff1
1
1
0
1
Transmit Xon1, Xon2/Xoff1, Xoff2, Receiver compares Xon2/Xoff2
1
1
1
1
Transmit Xon1, Xon2/Xoff1, Xoff2, Receiver compares Xon1, Xon2/Xoff1, Xoff2