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VITESSE

SEMICONDUCTOR CORPORATION

Advance Product Information

VSC7128

Features

鈥?Supports ANSI X3T11 1.0625Gb/s FC-AL Disk

Attach for Resiliency

鈥?Dual Repeaters (CRUs) Improve Signal Quality

鈥?Six Port Bypass Circuits (PBCs) for Resiliency

鈥?Dual Digital Signal Detect Units (SDUs)

Hex Port Bypass Circuit / Dual Repeater

for 1.0625 Gb/s FC-AL Disk Arrays

鈥?Fully Differential for Minimum Jitter

鈥?Selectable REFCLK: 53.125 / 106.25MHz

鈥?TTL Bypass Select

鈥?3.3V Supply, 1.3W

鈥?64-Pin, 14 mm Thermally Enhanced PQFP

General Description

The VSC7128 contains six Port Bypass Circuits (PBCs), dual embedded Clock Recovery Unit repeaters

(CRU) and dual Signal Detect Units (SDU). These functions are integrated into a single part to minimize circuit

size, part count, cost, high frequency routing and jitter accumulation. Together, they allow for optimized designs

of FC-AL JBOD systems that provide resiliency and hot insertion/removal of disk drives. The PBCs con鏗乬ure

the FC-AL loop to either include or exclude each drive. Repeaters retime the incoming signal thereby attenu-

ating jitter so that downstream devices see high amplitude, low jitter signals. The SDUs determine whether the

output of the CRU is a valid Fibre Channel signal. Disk drives are connected directly to the LSO/LSI/SEL pins

while the IN/OUT pins can be connected to any FC-AL devices.

VSC7128 Block Diagram

DISK

DRIVE

#1

DISK

DRIVE

#2

DISK

DRIVE

#3

DISK

DRIVE

#4

DISK

DRIVE

#5

DISK

DRIVE

#6

LSO1+

LSO1-

LSI1+

LSI1-

SEL1

LSO2+

LSO2-

LSI2+

LSI2-

SEL2

LSO3+

LSO3-

LSI3+

LSI3-

SEL3

LSO4+

LSO4-

LSI4+

LSI4-

SEL4

LSO5+

LSO5-

LSI5+

LSI5-

SEL5

SDU1

FAIL1-

Previous Device

IN1+

IN1-

CRU1

1

0

1

0

1

0

1

0

1

0

1

0

1

0

OUT2+

OUT2-

PBC1

OUT1+

OUT1-

PBC2

PBC3

PBC4

PBC5

MUX7

0

1

PBC6

IN2+

IN2-

CRU2

SDU2

FAILSEL

RFSEL

REFCLK

(106/53 MHz)

CMU

FAIL2-

SEL8

SEL7

G52177-0, Rev. 2.3

8/31/98

漏

VITESSE

SEMICONDUCTOR CORPORATION

741 Calle Plano, Camarillo, CA 93012 鈥?805/388-3700 鈥?FAX: 805/987-5896

Next Device

Page 1

MUX8

LSO6+

LSO6-

LSI6+

LSI6-

SEL6

next

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