Primitive: Gigabit Transceiver Buffer
- PRIMITIVE_GROUP: ADVANCED
- PRIMITIVE_SUBGROUP: GT
Introduction
IBUFDS_GTE4 is the gigabit transceiver input pad buffer component. The REFCLK signal should be routed to the dedicated reference clock input pins on the serial transceiver, and the user design should instantiate the IBUFDS_GTE4 primitive in the user design. See the Transceivers User Guide for more information on PCB layout requirements, including reference clock requirements.
Port Descriptions
| Port | Direction | Width | Function |
|---|---|---|---|
| CEB | Input | 1 | Refer to Transceiver User Guide. |
| I | Input | 1 | Refer to Transceiver User Guide. |
| IB | Input | 1 | Refer to Transceiver User Guide. |
| O | Output | 1 | Refer to Transceiver User Guide. |
| ODIV2 | Output | 1 | Refer to Transceiver User Guide. |
Design Entry Method
| Instantiation | Yes |
| Inference | No |
| IP and IP Integrator Catalog | Recommended |
Available Attributes
| Attribute | Type | Allowed Values | Default | Description |
|---|---|---|---|---|
| REFCLK_EN_TX_PATH | BINARY | 1'b0 to 1'b1 | 1'b0 | Refer to Transceiver User Guide. |
| REFCLK_HROW_CK_SEL | BINARY | 2'b00 to 2'b11 | 2'b00 | Refer to Transceiver User Guide. |
| REFCLK_ICNTL_RX | BINARY | 2'b00 to 2'b11 | 2'b00 | Refer to Transceiver User Guide. |
VHDL Instantiation Template
Unless they already exist, copy the following
two statements and paste them before the entity declaration.
Library UNISIM;
use UNISIM.vcomponents.all;
-- IBUFDS_GTE4: Gigabit Transceiver Buffer
-- Spartan UltraScale+
-- Xilinx HDL Language Template, version 2025.2
IBUFDS_GTE4_inst : IBUFDS_GTE4
generic map (
REFCLK_EN_TX_PATH => '0', -- Refer to Transceiver User Guide.
REFCLK_HROW_CK_SEL => "00", -- Refer to Transceiver User Guide.
REFCLK_ICNTL_RX => "00" -- Refer to Transceiver User Guide.
)
port map (
O => O, -- 1-bit output: Refer to Transceiver User Guide.
ODIV2 => ODIV2, -- 1-bit output: Refer to Transceiver User Guide.
CEB => CEB, -- 1-bit input: Refer to Transceiver User Guide.
I => I, -- 1-bit input: Refer to Transceiver User Guide.
IB => IB -- 1-bit input: Refer to Transceiver User Guide.
);
-- End of IBUFDS_GTE4_inst instantiation
Verilog Instantiation Template
// IBUFDS_GTE4: Gigabit Transceiver Buffer
// Spartan UltraScale+
// Xilinx HDL Language Template, version 2025.2
IBUFDS_GTE4 #(
.REFCLK_EN_TX_PATH(1'b0), // Refer to Transceiver User Guide.
.REFCLK_HROW_CK_SEL(2'b00), // Refer to Transceiver User Guide.
.REFCLK_ICNTL_RX(2'b00) // Refer to Transceiver User Guide.
)
IBUFDS_GTE4_inst (
.O(O), // 1-bit output: Refer to Transceiver User Guide.
.ODIV2(ODIV2), // 1-bit output: Refer to Transceiver User Guide.
.CEB(CEB), // 1-bit input: Refer to Transceiver User Guide.
.I(I), // 1-bit input: Refer to Transceiver User Guide.
.IB(IB) // 1-bit input: Refer to Transceiver User Guide.
);
// End of IBUFDS_GTE4_inst instantiation