Home Menu
Home » 技术支持 » 常见问题

常见问题

搜寻我们的常见问题知识库,找到您所需的 Pericom 产品和服务问题解答。

Most Commonly Asked Questions

Can I cross reference with competitors products?

We do not currently have an updated Cross Reference tool. We are in the process of developing and updating our Cross Reference tool, which we hope to roll out later this year.

Can I plug this board in a PCI-X slot?

Yes you can, the PCI-X specification is backward compatible with this bridge, and it will work at 66 MHz speed.

Can Pericom provide Spice model for simulation?

Spice model for simulation is available upon request. Please contact Pericom Customer Support.

Does Pericom have a Quality Policy Manual?

Yes. Please see our Quality Policy Manual.

External links to some of the ASSPXO/VCXO datasheets are missing, where can I go to access them?

Please go to the Media & Downloads page. From there please click on the tab called "FCP Support Documents".
In that section, you should be able to access all the links related to each product, in terms of reflow, test circuits and tape and reel information. We apologise for the inconvenience.

Hot-Insertion: Is it guaranteed "Safe" to Remove or Insert a module containing the PI7C7300D device from a powered up "live" system?

The  is "hot-swap friendly", which essentially means it can interface to a hot-swap power controller. But by itself cannot withstand Vcc=0V and live signals at the I/O pins -- in this mode, current will flow through our bridge. Therefore, if ever there is a possibility of this happening, we require a hot-swap power controller and switches for isolation. If you do not need to pre-charge your switched signals, then the less costly  or  switches are appropriate for the signal switches. Most of our customers use this switch in their applications.

 

How can I contact sales?

Pericom Sales managers, Sales Representatives, and Distributors can be found in the Contact section of our site.

How compatible is your part to the 21152? Will Intel drivers work with this device?

The  was intended to be a pin compatible drop-in replacement to the Intel 21152. The drivers that currently work for the Intel device will function with our device as well. The  does not require any external drivers, but instead utilizes the embedded drivers in Windows. The only issue that may come up is that if your software is looking specifically for the Intel device and vendor ID's, it will need to be modified. The  has an added feature, it can work at 66 MHz. our device ID and vendor ID are different from Intel's.

How compatible is your part to the Intel 21150? Will Intel drivers work with this device?

The  was intended to be a pin compatible drop-in replacement to the Intel 21150. The drivers that currently work for the Intel device will function with our device as well. The  does not require any external drivers, but instead utilizes the embedded drivers in Windows. The only issue that may come up is that if your software is looking specifically for the Intel device and vendor ID's, it will need to be modified. Our device and vendor ID's are different from Intel's.

How do I know if a device has been obsoleted? I am unable of find the datasheet on the Pericom website.

If the datasheet is not found on Pericom's website, it is a strong indication that the part has been obsoleted. there are several ways to find out.  The first method would be to check on the Product Detail page for your particular product choice, if there are related PDN notices, they will show up on the tab, marked "PDNS".

Alternatively go Discontinuation Notices to search for the part number.

How does Pericom identify and mark its manufacturing date codes?

Please see the Pericom Date Code Policy.

To which version of the Intel 21154 is the PI7C8154 pin compatible?

This bridge is designed to Intel 21154BE capabilities (power management support at pin D11, 2KV ESD rating, 0.35 micron process, and more robust tolerances for 3.3V/5V power start up sequence.) The bridge also can be used in designs intended for 21154 versions AC, AE, and BC also.

What does "TCXO" mean?

TCXO means "Temperature Compensated Crystal Oscillator" A TCXO is essentially a quartz crystal integrated with compensation electronic circuitry sensitive to temperature variation. The compensation circuitry helps TCXO maintain high frequency stability over temperature (0.5ppm - 5ppm)

 

What's the difference between Intel and Pericom FIFO sizes?

(From http://www.intel.com/design/bridge/index.htm ) The Intel 21154 has (in bytes) . Primary write = 88 bytes , read = 72 bytes, Delayed entries =3 secondary write= 152 bytes . read =152 bytes,Delayed entries= 3 . For the Pericom PI7C8154: (posted write buffer and delayed transaction buffer data size for FIFOs)primary write= 128+128 bytes. Read= 128+128 bytes. Delayed entries= 8. The same for the secondary.Thus the Pericom 8154 has MORE FIFO buffering than Intel.

 

When using the PI7C7300 in hot-swap hardware, which Vcc do I connect it to?

According to the hot-swap specification revision 1.0., the bridge should be connected to early power. All other chips on the board should be connected to switched power, which comes later, driven from the Hot-swap controller.

 

Where can I find plastic package thermal data?

Package Thermal Data can be found under Packaging section. Please refer to the Packaging Mechanicals & Thermal Characteristics table.

Where can I find the latest information on Product and Package Reliability data?

Please see Pericom's Product Quality & Reliability Page.

Where can obsolete devices information be found?

Obsolete information can be found in the Quality Section of our website. Please refer to the Discontinuation Notices

Where can silicon revision (PCN - process change notice) information be found?

Silicon revision information can be found under the Quality section of our site. Please refer to the Product Change Notices

Where can Theta J and Theta C data be found?

Theta J and Theta C can be found in the Packaging section of our site. Please refer to the Packaging Mechanicals & Thermal Characteristics Table.

Where do I find the datasheets for products?

In most cases, the datasheets for all released products can be found on the website.

Once you have tailored your search using the relevant Finder tool, simply click on the part of interest, which takes you to the Product Detail page, where a pdf link is provided. In some cases, when the products are protected, you may be redirected to a questionaire and prompted to contact Sales/Marketing.

 

Why do I need a PCI-to-PCI-Bridge?

There are many uses for this chip including:

1) To alleviate the excessive loading on the motherboard. This chip can be used on a server board, or a main board in a system that needs many I/O cards connected to it; these I/O cards can be Ethernet, Fiberchannel, SCSI, or any other PCI I/O cards. PCI specification rev 2.2 allows you to have as many as 4 slots @ 33 MHz slots and two 66 MHz slots. If your system requires more then 4 slots, then you need to add a PCI-to-PCI Bridge. This bridge will take one load only, but it will allow you to add four additional slots on the other side. See Figure 1 of application note 55 available on the web.

2) If you have more than one PCI interface chip on an add-in card. If you are designing an intelligent add-in card that requires a CPU and an I/O chip like Ethernet, SCSI, or Fiberchannel, then you will have two or more PCI loads, in this case you must have a PCI-to-PCI bridge on the card. The PCI specification rev 2.2 allows only one PCI Load connected to the PCI Edge connector. See Figure 3 of Application Note 55 available on the web.

3) If you have many types of interfaces, and you would like to isolate each application’s traffic to a specific bus (example: you have couple of Ethernet chips on your system that need to be 32-bit and 66 MHz and have two low-performance 32-bit applications like modem cards running at 33 MHz). In this case, to isolate the two distinct applications you would add one bridge for the 66 MHz high-speed I/O interfaces, and another bridge for the low-speed applications. The benefit is that the high speed I/O card does not have to wait for the low-speed application to finish its transfer. You will also have one bus running at 66 MHz and another slow bus running at 33 MHz.