DS485 Datasheet, PDF (4/6 Pages) National Semiconductor (TI) – Low Power RS-485/RS-422 Multipoint Transceiver

Table 1: MPD Parameters (Cont’d)
Parameter Name
Feature Description
Allowable
Values
Default
C_CLKFX_BUF
If C_CLKFX_BUF is true, a BUFG is
inserted; otherwise, CLKFX signal is
connected to the equivalent pin of DCM
directly.
True, False
false
C_CLKFX180_BUF
If C_CLKFX180_BUF is true, a BUFG is
inserted; otherwise, CLKFX180 signal is
connected to the equivalent pin of DCM
directly.
True, False
false
If C_EXT_RESET_HIGH = 0, an inverter
C_EXT_RESET_HIGH
is inserted for RST pin of DCM;
otherwise, this RST is connected to the
0, 1
1
equivalent pin of DCM directly.
C_FAMILY
Target architecture family for design
See C_FAMILY parameter
values.
Type
boolean
boolean
integer
string
Allowable Parameter Combinations
There are no restrictions on parameter combinations beyond those defined for the DCM primitive in
the target FPGA architecture. Please refer to the user guide for the particular FPGA architecture.
DCM Module I/O Signals
The DCM Module I/O signals are listed and described in Table 2.
Table 2: Summary of DCM Module I/O
Signal
I/O
Initial
State
Description
RST
I
If C_EXT_RESET_HIGH = 0, an inverter is inserted. Then three DFFs
are inserted before this signal is connected to the equivalent pin of DCM.
CLKIN
I
If C_CLKIN_BUF = true, a BUFG is inserted; otherwise, this signal is
connected to the equivalent pin of DCM directly.
CLKFB
I
If C_CLKFB_BUF = true, a BUFG is inserted; otherwise, this signal is
connected to the equivalent pin of DCM directly
PSEN
I
Connect to the equivalent pin of DCM directly.
PSINCDEC
I
Connect to the equivalent pin of DCM directly.
PSCLK
I
Connect to the equivalent pin of DCM directly.
DSSEN
I
Connect to the equivalent pin of DCM directly.
CLK0
O
Same as If C_CLKIN_BUF = true, a BUFG is inserted; otherwise, this signal is
primitive connected to the equivalent pin of DCM directly.
CLK90
O
Same as If C_CLK90_BUF = true, a BUFG is inserted; otherwise, this signal is
primitive connected to the equivalent pin of DCM directly.
CLK180
O
Same as If C_CLK180_BUF = true, a BUFG is inserted; otherwise, this signal is
primitive connected to the equivalent pin of DCM directly.
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