VSC7122QM Vitesse Semiconductor Corp., VSC7122QM Datasheet

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VSC7122QM

Manufacturer Part Number
VSC7122QM
Description
Quad port bypass circuit for 1.0625 Gb/s fibre channel arbitrated loop disk arrays. 3.3 power supply
Manufacturer
Vitesse Semiconductor Corp.
Datasheet

Specifications of VSC7122QM

Case
QFP
Dc
99+
VSC7122
Advance Product Information
8/31/98
G52155-0, Rev. 2.1
General Description
part to minimize part count, cost, high frequency routing, and jitter accumulation. Port Bypass Circuits are used
to provide resiliency in Fibre Channel Arbitrated Loop (FC-AL) architectures. PBC’s are used within FC-AL
disk arrays to allow for resiliency and hot swapping of FC-AL drives.
MAL mode, the disk drive is connected to the loop. Data goes from the 7122’s L_SOn pin to the Disk Drive RX
input and data from the disk drive TX output goes to the 7122’s L_SIn pin. Refer to Figure 2 for disk drive
application. In BYPASS mode, the disk drive is either absent or non-functional and data bypasses to the next
available disk drive. Normal mode is enabled with a HIGH on the SEL pin and BYPASS mode is enabled by a
LOW on the SEL pin. Direct Attach Fibre Channel Disk Drives have an “LRC Interlock” signal defined to con-
trol the SEL function.
AL drives are all expected to be dual loop. The VSC7122 is cascaded in a manner such that all the 7122’s inter-
nal PBC’s are used in the same loop. For dual loop implementations, two or more VSC7122’s should be used.
Allocating each VSC7122 to only one of two loops preserves redundancy, prevents a single point of failure and
lends itself to on-line maintainability.
to OUT. This is useful in passive backplanes to provide additional amplitude on long traces.
7122 Block Diagram
Features
IN+
IN-
The VSC7122 is a Quad Port Bypass Circuit (PBC). Four Fibre Channel PBC’s are cascaded into a single
A Port Bypass Circuit is a 2:1 Multiplexer with two modes of operation: NORMAL and BYPASS. In NOR-
Using a VSC7122 in a single loop of a disk array is illustrated in Figure 2: “Disk Array Application”. FC-
The VSC7122 is very similar to the VSC7121 except that LSO+ outputs are all full power outputs identical
• Supports ANSI X3T11 1.0625 Gbit/sec
• Fully Differential for Minimum
• Quad PBC’s in Single Package
FC-AL Disk Attach for Resiliency
Jitter Accumulation.
PBC1
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
1
0
VITESSE
VITESSE SEMICONDUCTOR CORPORATION
SEMICONDUCTOR CORPORATION
PBC2
1
0
Quad Port Bypass Circuit for 1.0625 Gbit/sec
PBC3
Fibre Channel Arbitrated Loop Disk Arrays
• TTL Bypass Select
• High Speed, PECL I/O’s Referenced to V
• 0.35W Typical Power Dissipation
• 3.3V Power Supply
• 44-Pin, 10mm PQFP
1
0
PBC4
1
0
OUT+
OUT-
DD
.
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Related parts for VSC7122QM

VSC7122QM Summary of contents

Page 1

Advance Product Information VSC7122 Features • Supports ANSI X3T11 1.0625 Gbit/sec FC-AL Disk Attach for Resiliency • Fully Differential for Minimum Jitter Accumulation. • Quad PBC’s in Single Package General Description The VSC7122 is a Quad Port Bypass Circuit (PBC). ...

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Quad Port Bypass Circuit for 1.0625 Gbit/sec Fibre Channel Arbitrated Loop Disk Arrays The VSC7122 can be cascaded through the IN and OUT pins for arrays of disk drives greater than 4. For disk arrays with a noninteger multiple of ...

Page 3

Advance Product Information VSC7122 Optics Dual Copper DB-9 JBOD G52155-0, Rev. 2.1 8/31/98 741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896 VITESSE SEMICONDUCTOR CORPORATION Quad Port Bypass Circuit for 1.0625 Gbit/sec Fibre Channel Arbitrated ...

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Quad Port Bypass Circuit for 1.0625 Gbit/sec Fibre Channel Arbitrated Loop Disk Arrays Table 2: AC Characteristics Parameters Description Flow-Through Propagation Delay T 1 Rising Edge to Rising Edge Flow through Propagation Delay T 2 Falling Edge to Falling Edge ...

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Advance Product Information VSC7122 Absolute Maximum Ratings TTL Power Supply Voltage, (V PECL DC Input Voltage, (V INP TTL DC Input Voltage ..........................................................................................................-0.5V to 5.5V INT DC Voltage Applied to Outputs for High Output State, (V TTL Output ...

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Quad Port Bypass Circuit for 1.0625 Gbit/sec Fibre Channel Arbitrated Loop Disk Arrays Input Structures Two input structures exist in this part; TTL and High Speed, Differential Inputs. The TTL Inputs will inter- face with any TTL or 3.3V or ...

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Advance Product Information VSC7122 VSS VDD L_SI1- L_SI1+ VDDP L_SO1- L_SO1+ VSS IN- IN+ VSS G52155-0, Rev. 2.1 8/31/98 741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896 VITESSE SEMICONDUCTOR CORPORATION Quad Port Bypass Circuit for 1.0625 Gbit/sec ...

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Quad Port Bypass Circuit for 1.0625 Gbit/sec Fibre Channel Arbitrated Loop Disk Arrays Table 4: Pin Description Pin # Name 9, 10 IN-, IN L_SI1-, L_SI1+ 40, 41 L_SI2-, L_SI2+ 34, 35 L_SI3-, L_SI3+ 27, 28 L_SI4-, L_SI4+ ...

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Advance Product Information VSC7122 Package Information 0.30 RAD. TYP. 0.20 RAD. TYP. NOTES: Drawing not to scale. Cavity up All units in mm unless otherwise noted. G52155-0, Rev. 2.1 8/31/98 741 Calle Plano, Camarillo, ...

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Quad Port Bypass Circuit for 1.0625 Gbit/sec Fibre Channel Arbitrated Loop Disk Arrays Package Thermal Characteristics The VSC7122 is packaged into a standard plastic quad flatpack with an embedded, but unexposed thermal slug. This package adheres to industry standard EIAJ ...

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... Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896 VITESSE SEMICONDUCTOR CORPORATION Quad Port Bypass Circuit for 1.0625 Gbit/sec Fibre Channel Arbitrated Loop Disk Arrays VSC7122 VSC7122 - 1.0625 Gbits/sec Port Bypass Circuit VITESSE VSC7122QM ####AAAA Lot Tracking Code Date Code VITESSE SEMICONDUCTOR CORPORATION QM Package Suffix Page 11 ...

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Quad Port Bypass Circuit for 1.0625 Gbit/sec Fibre Channel Arbitrated Loop Disk Arrays Page 12 741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896 VITESSE SEMICONDUCTOR CORPORATION Advance Product Information VITESSE SEMICONDUCTOR CORPORATION VSC7122 G52155-0, Rev. 2.1 8/31/98 ...

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