The FPC402 quad port controller serves as a low-speed signal aggregator for common port
types such as SFP, QSFP, Mini-SAS HD, and others. The FPC402 aggregates all low-speed control and
I2C signals across four ports and presents a single easy-to-use management interface to the host
(I2C or SPI). Multiple FPC402s can be used in high-port-count applications with one common control
interface to the host. The FPC402 is designed to allow placement on the bottom side of the PCB,
underneath the press fit connector, to simplify routing. This localized control of the low-speed
signals in the ports cuts system BOM costs by enabling the use of smaller IO count control devices
(FPGAs, CPLDs, and MCUs) and by reducing routing layer congestion.
The FPC402 is compatible with standard SFF-8431, SFF-8436, and SFF-8449 low-speed
management interfaces, including a dedicated 100- or 400-kHz I2C interface to each port. Additional
general-purpose pins are available to perform functions such as driving port status LEDs or
controlling power switches. The LED drivers have convenience features such as programmable blinking
and dimming. The interface to the host controller can operate on a separate supply voltage between
1.8 V and 3.3 V to support low-voltage I/Os.
The FPC402 can prefetch data from user-specified registers in each module, making the
data readily accessible to the host through a fast I2C (up to 1 MHz) or SPI (up to 10 MHz)
interface. In addition, the FPC402 can trigger an interrupt to the host whenever critical,
user-configurable events occur associated with any of the ports the device controls. This
eliminates the need to continuously poll the modules.
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