CD2231

Manufacturer Part NumberCD2231
DescriptionCD2231 Intelligent Two-channel Lan And Wan Communications Controller
ManufacturerIntel Corporation
CD2231 datasheet
 


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Intelligent Two-Channel LAN and WAN Communications Controller — CD2231
Dpllmd1
Bits 2:0
These three bits select the clock source for the receive baud rate generator or DPLL.
NOTE: See the description of clock options in
8.3.2
Transmit Baud Rate Generator Registers
8.3.2.1
Transmit Baud Rate Period Register (TBPR)
Register Name: TBPR
Register Description: Transmit Bit-Rate Period
Default Value: x’81
Access: Byte Read/Write
Bit 7
Bit 6
Bit 5
This register contains the preload value for the transmit baud rate count. When using one of the
internal clocks or an n-times external clock, the preload value in conjunction with the transmitter
clock source chosen, determines the transmit bit rate. If a 1 external clock or the receive clock is
used, a value of 01h must be loaded in the TBPR.
Datasheet
Dpllmd0
Encoding
0
0
NRZ
0
1
NRZI
1
0
Manchester
1
1
Reserved
clkSel2
clkSel1
clkSel0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Section
5.5.
Bit 4
Bit 3
Transmit bit rate period (divisor)
Clock Source
Clk 0
Clk 1
Clk 2
Clk 3
Clk 4
Reserved
External clock
Reserved
Intel Hex Address: x’C1
Motorola Hex Address: x’C3
Bit 2
Bit 1
Bit 0
111