DS485 Datasheet, PDF (2/6 Pages) National Semiconductor (TI) – Low Power RS-485/RS-422 Multipoint Transceiver

Functional Description
The Digital Clock Manager (DCM) is shown in the block diagram in Figure 1.
Figure Top x-ref 1
Configurable
Logic
RST
FF
FF
FF
Configurable
Logic
CLK*
BUFG
DCM
Primitive
BUFG
CLK*
PS*/.DS*
Figure 1: DCM Module Block Diagram
PS DONE
STATUS LOCKED
DS485_01_012607
DCM Module Parameters
The associated MPD (Microprocessor Peripheral Definition) file contains a list of the parameter of the
peripheral that are fixed at FPGA configuration time. The parameters are described in Table 1.
Table 1: MPD Parameters
Parameter Name
Feature Description
Allowable
Values
Default
Type
C_DFS_FREQUENCY_ This parameter passes the value to the
MODE
equivalent attribute of DCM.
Same as
primitive
“LOW”
string
C_DLL_FREQUENCY_M This parameter passes the value to the
ODE
equivalent attribute of DCM.
Same as
primitive
“LOW”
string
C_DUTY_CYCLE_COR This parameter passes the value to the
RECTION
equivalent attribute of DCM.
Same as
primitive
true
boolean
C_CLKIN_DIVIDE_BY_2
This parameter passes the value to the
equivalent attribute of DCM.
Same as
primitive
false boolean
C_CLK_FEEDBACK
This parameter passes the value to the
equivalent attribute of DCM.
Same as
primitive
“1X”
string
C_CLKOUT_PHASE_SH This parameter passes the value to the
IFT
equivalent attribute of DCM.
Same as
primitive
“NONE” string
C_DSS_MODE
This parameter passes the value to the
equivalent attribute of DCM.
Same as
primitive
“NONE” string
C_STARTUP_WAIT
This parameter passes the value to the
equivalent attribute of DCM.
Same as
primitive
false boolean
C_PHASE_SHIFT
This parameter passes the value to the
equivalent attribute of DCM.
Same as
primitive
0
integer
C_CLKFX_MULTIPLY
This parameter passes the value to the
equivalent attribute of DCM.
Same as
primitive
4
integer
C_CLKFX_DIVIDE
This parameter passes the value to the
equivalent attribute of DCM.
Same as
primitive
1
integer
2
www.xilinx.com