VSC055

Enhanced Two-Wire Serial Backplane Controller

Low-Cost Backplane Controller with 5V Tolerant GPIO

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Overview

Up to 64 Bits of User-Definable, Bidirectional General-Purpose Inputs and Outputs
Integrated Port Bypass, Clock Recovery, and Signal Detect Support for Up to 16 Drives
Eight Programmable Fan Speed Monitoring Inputs
Eight Programmable Pulse-Width-Modulated Fan Control Outputs
Up to 32 Programmable Input-to-Output Bypass Pairs
Two Clock Input Ranges: 8.0MHz to 12.5MHz (External Crystal or External Clock Source) and 32.0MHz to 75.0MHz (External Clock Source)
Selectable Direct LED Drive Flashing Capability
Pin-Programmable Addressing for Up to 16 Devices on a Single Serial Bus
5V Tolerant High-Current I/O, Slave Mode Two-Wire Serial Interface and Interrupt Output
10 Programmable LED Pulse Train Circuits
One 24-Bit General-Purpose Timer (Supports a Timeout Greater Than Four Seconds with a 12.5MHz Core Clock)

The VSC055 is an I/O-intensive peripheral device that is intended to be part of a cost-effective Fibre Channel Arbitrated Loop (FC-AL), Small Computer System Interface (SCSI), Serial Attached SCSI (SAS), or Serial ATA (SATA) enclosure management solution. The device contains an address-programmable two-wire serial interface, a block of control and status registers, I/O port control logic, specialized port bypass control logic, and a clock-generation block.

Along with an external crystal, the device can be configured to support up to 64 bits of general-purpose I/O, or 16 bits of general-purpose I/O, 32 bits of port bypass control (16 pairs supporting 16 drives), eight fan speed monitoring inputs, and eight pulse-width-modulated general-purpose control outputs.

The VSC055 supports various combinations of individual port bypass circuit (PBC), clock recovery unit (CRU), and signal detect unit (SDU) functions, as well as integrated solutions. The control register portion of the device allows the user to individually program each I/O pin as an input, an output, or an open-drain or open-source output.

Additional control features include selectable flash rates for direct LED drive, input edge detection for interrupt generation, input to output bypass capability, fan speed monitoring control, and pulse-width-modulated output control. Support for subaddressing additional two-wire serial slave devices using a set of seven control registers is included. This capability allows up to 16 independent master mode two-wire serial slave ports to be created using 32 of the I/O pins.

The addressing capability of the VSC055 includes three pins, which are used for device addressing, as well as one pin that can be used to select two device type identifiers. Sixteen VSC055 devices can be used in a single two-wire serial interface system.

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