ORT82G5-1BM680C LATTICE [Lattice Semiconductor], ORT82G5-1BM680C Datasheet - Page 85

• Manufacturer Part Number: ORT82G5-1BM680C
• Description: 0.6 to 3.7 Gbps XAUI and FC FPSCs
• Manufacturer: LATTICE [Lattice Semiconductor]

Lattice Semiconductor
Power Supplies for ORT42G5 AND ORT82G5
Power Supply Descriptions
Table shows the ORT42G5 and ORT82G5 FPGA and embedded core power supply groupings. VDD33 Is a 3.3V
positive power supply used for 3.3V configuration RAMs and internal PLLs. When using PLLs, this power supply
should be well isolated from all other power supplies on the board for proper operation. The five VDDIO supplies
are positive power supply used by the FPGA I/O banks.The 1.5 volt digital power supplies are used for the FPGA
and the embedded core transmit and receive digital logic including the microprocessor logic. The 1.5 volt analog
power supply is used for high-speed analog circuitry in the embedded core between the I/O buffers and the digital
logic. The RX input buffer power supplies are used to power the input (receive) buffers. The TX output buffer sup-
plies are used to power the output (transmit) buffers. The Rx and TX buffer power supplies can be independently
set to 1.5V or 1.8V, depending on the end application. The guard band supplies are independent connection
brought out to pins.
Table 42. Power Supplies
Recommended Power Supply Connections
Ideally, a board should have the power supplies described below:
• VDD33 and VDDIO supplies for the FPGA Logic
• A single 1.5V source to supply power to FPGA and core digital logic.
• A dedicated 1.5V power supply for the analog power pins. This will allow the end user to minimize noise. The
• TX output buffer power. The power supplies to the TS output buffers should be isolated from the rest of the board
• RX input buffer power. The power supplies to the Rx input buffers should be isolated from the rest of the board
Recommended Power Supply Filtering Scheme
The board connections of the various SERDES V
demonstration board schematic is available at www.latticesemi.com.
Power supply filtering is in the form of:
• A parallel bypass capacitor network consisting of 10 µf, 0.1 µf, and 1.0 µf caps close to the power source.
• A parallel bypass capacitor network consisting of 0.01 µf and 0.1 µf close to the pin on the ORT42G5.
1. ORT82G5 only.
guard band pins can also be sourced from the analog power supplies.
power supplies. Special care must be taken to minimize noise when providing board level power to these output
buffers. The power supply can be 1.5V or 1.8V depending on the end application.
power supplies. Special care must be taken to minimize noise when providing board level power to these input
buffers. The power supply can be 1.5V or 1.8V depending on the end application.
FPGA Supplies
VDDIO0
VDDIO1
VDDIO5
VDDIO6
VDDIO7
VDD33
FPGA and Core
Digital Supply
V
1.5V
DD
—
—
—
—
—
—
—
15
Analog 1.5V
V
DD
_ANA
DD
and V
85
Tx Output Buffers
SS
ORCA ORT42G5 and ORT82G5 Data Sheet
V
V
V
V
V
V
V
V
pins are critical to system performance. An example
1.5V/1.8V
DD
DD
DD
DD
(V
DD
DD
DD
DD
DD
OB_AA
OB_AB
OB_BA
OB_BB
OB_AC
OB_AD
OB_BC
OB_BD
OB)
1
1
1
1
Rx Input Buffers
V
V
V
V
V
V
V
V
1.5V/1.8V
DD
DD
DD
DD
(V
DD
DD
DD
DD
DD
IB_AA
IB_AB
IB_BA
IB_BB
IB_AC
IB_AD
IB_BC
IB_BD
IB)
1
1
1
1
Guard Band
V
V
(V
DD
DD
1.5V
DD
—
—
—
—
—
—
GB_A
GB_B
GB)