MCS9845 MosChip Semiconductor, MCS9845 Datasheet - Page 6

• Manufacturer Part Number: MCS9845
• Description: PCI Dual UART
• Manufacturer: MosChip Semiconductor

Page 6
MCS9845
PCI Dual UART with ISA Bridge
nDSRA
nDTRB
nDSRB
nRTSA
nDTRA
nCTSA
nRTSB
nCTSB
Name
BCLK
nCDA
nRIA
RXB
TXA
RXA
TXB
105
107
106
109
Pin
111
110
112
113
57
76
74
75
73
71
72
Type
O
O
O
O
O
O
I
I
I
I
I
I
I
I
I
UART-B clock input.
BCLK should be connected to the 12XCLK output pin.
UART-A serial Data Output.
UART-A Request-To-Send signal.
It is set high (inactive) after a hardware Reset or during internal Loop-Back mode.
When low, this indicates that UART-A is ready to transfer data. nRTSA has no effect
on the transmitter or receiver.
UART-A Data-Terminal-Ready signal.
It is set high (inactive) after a hardware Reset or during internal Loop-Back mode.
When low, this output indicates to the modem or data set that UART-A is ready
to establish a communication link. nDTRA has no effect on the transmitter or
receiver.
UART-A, serial Data Input.
UART-A Clear-To-Send signal.
When low, this indicates that the modem or data set is ready to exchange data.
nCTSA has no effect on the transmitter.
UART-A Data-Set-Ready signal.
When low, this indicates the modem or data set is ready to establish a communication
link.
UART-A Carrier-Detect signal.
When low, this indicates the modem or data set has detected the data carrier.
nCDA has no effect on the transmitter.
UART-A Ring-detect signal.
UART-B serial Data Output.
UART-B Request-To-Send signal.
It is set high (inactive) after a hardware Reset or during internal Loop-Back mode.
When low, this indicates UART-B is ready to exchange data. nRTSB has no effect
on the transmitter or receiver.
UART-B Data-Terminal-Ready signal.
It is set high (inactive) after a hardware Reset or during internal Loop-Back mode.
When low, this indicates to the modem or data set that UART-B is ready to establish
a communication link. nDTRB has no effect on the transmitter or receiver.
UART-B, serial Data Input.
UART-B Clear-To-Send signal.
When low, this indicates the modem or data set is ready to exchange data. nCTSB
has no effect on the transmitter.
UART-B Data-Set-Ready signal.
When low, this indicates the modem or data set is ready to establish a communication
link.
Description
www.DataSheet4U.com
Rev.
2.5