Hewlett-Packard HDMP-0440
The HDMP-0440 is a Quad Port Bypass Circuit (PBC), which provides a low-cost, low-power physical-layer solution for Fibre Channel Arbitrated Loop (FC-AL) disk array configurations. By using a PBC such as the HDMP-0440, hard disks may be pulled out or swapped while other disks in the array are available to the system. Each port has two modes of operation: “disk in loop” and “disk bypassed.” When the “disk in loop” mode is selected, the loop goes into and out of the disk drive at that port.| Part No. | HDMP-0440 |
|---|---|
| Datasheet | HDMP-0440 Download |
| Manufacturer |  Hewlett-Packard |
| Description | Quad Port Bypass Circuit |
| Buy | Stock & Price |
FEATURES
● Supports 1.0625 GBd Fibre Channel operation● Supports 1.25 GBd Gigabit Ethernet (GE) operation
● Quad PBC in one package
● Equalizers on all inputs
● High-speed LVPECL I/O
● Buffered Line Logic (BLL) outputs (no external bias resistors required)
● 0.5 W typical power at VCC = 3.3 V
● 44 Pin, 10 mm, low-cost plastic QFP package
APPLICATIONS
● RAID, JBOD, BTS cabinets● Two 2:1 muxes
● Two 1:2 buffers
● 1 ≥ N Gigabit serial buffer
● N ≥ 1 Gigabit serial mux
DESCRIPTION
A PBC consists of multiple 2:1 multiplexers daisy chained together. For example, data goes from the HDMP-0440’s TO_NODE[n]± differential output pins to the Disk Drive Transceiver IC’s (e.g. an HDMP-1636A) Rx differential input pins. Data from the Disk Drive Transceiver IC’s Tx differential outputs goes to the HDMP-0440’s FM_NODE[n]± differential input pins. Figure 2 shows connection diagrams for disk drive array applications. When the “disk bypassed” mode is selected, the disk drive is either absent or non-functional and the loop bypasses the hard disk.
