IBUFDS, IBUFGDS, and OBUFDS are differential signal buffers for buffering and conversion between different level interfaces.
1) IBUFDS is used for differential input;
2) OBUFDS is used for differential output;
3) IBUFGDS is an input buffer dedicated to the clock signal.
The following details:
1, IBUFDS (DifferenTIalSignaling Input Buffer with Selectable I / O Interface) / / differential input clock buffer
IBUFDS is an input buffer that supports low voltage differential signals (such as LVCMOS, LVDS, etc.). In IBUFDS, a level interface is represented by two unique level interfaces (I and IB). One can be considered a master signal and the other can be considered a slave signal. The main signal and the slave signal are the same logic signal, but the phases are opposite.
Input input output
I IB O
0 0 No change
0 1 0
1 0 1
1 1 No change
IBUFDS instance_name (.O (user_O), .I (user_I), .IB (user_IB));
2, OBUFDS (DifferenTIalSignaling Output Buffer with Selectable I / O Interface) / / differential output clock buffer
OBUFDS is an output buffer that supports low voltage differential signaling. The OBUFDS isolates the internal circuitry and provides drive current to the signals on the chip. Its output is represented by two separate interfaces, O and OB. One can be considered a master signal and the other can be considered a slave signal. The main signal and the slave signal are the same logic signal, but the phases are opposite.
Input input output
I IB O
0 0 No change
0 1 0
1 0 1
1 1 No change ance_name (.O (user_O), .I (user_I), .IB (user_IB));
3, IBUFGDS (DedicatedDifferenTIal Signaling Input Buffer with Selectable I / O Interface) / / dedicated differential input clock buffer
IBUFGDS is a dedicated differential signal input buffer that connects to the clock signal BUFG or DCM. In IBUFGDS, a level interface is represented by two independent level interfaces (I and IB). One can be considered a master signal and the other can be considered a slave signal. The main signal and the slave signal are the same logic signal, but the phases are opposite.
Input input output
I IB O
0 0 No change
0 1 0
1 0 1
1 1 No change
IBUFGDS instance_name (.O (user_O), .I (user_I), .IB (user_IB));
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