Cirrus-logic AN205 Manuel d'utilisateur télécharger pdf

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Cirrus Logic, Inc. 2002

Cirrus Logic, Inc.

P.O. Box 17847, Austin, Texas 78760

(512) 445 7222 FAX: (512) 445 7581

http://www.cirrus.com

AN205

Application Note

CS8900A FREQUENTLY ASKED QUESTIONS

1) Application Note 181 says that interrupts are not supported in 8-bit mode. Is this really true?

Yes, interrupts are NOT supported in 8-bit mode. They might appear to work for a while but will

eventually fail.

2) What free TCP/IP software does Cirrus Logic provide for use with the CS8900A?

None. Some recommended sources for TCP/IP are US Software, and Interniche,

http://www.lantronix.com/products/esw/index.html and http://www.iniche.com/products/tcpip.htm.

Both have products that are compatible with the CS8900A.

3) I see that the CS8900A has I/O mode and Memory Mode. Is there a performance advantage to using

Memory Mode?

I/O Mode is 99.6% as fast as Memory Mode. Also, since the CS8900A defaults to I/O AND you don't

need glue logic in most systems in I/O Mode, Cirrus Logic recommends the use of the I/O mode.

4) I just got my boards back and I want to verify operation of the CS8900A. What do I do?

Follow these steps:

a)Plug in a 10BaseT cable from the RJ-45 on your device to a hub. Check for a link light on both

sides.

b)Read the Packet Page Data Port (Offset 0xC from the CS8900A base address in your system, I/O

Mode). You should get 0x0E63 or 0x630E (depending on byte ordering of your processor).

c)Write 0x0102 to Packet Page Pointer Port (Offset 0xA).

d)Read the Packet Page Data Port. You should get 0x3.

5) When I read from the CS8900A I get data that is not intelligible.

Download the application note, Crystal LAN

™

CS8900A Ethernet Controller Technical Reference

Manual, (AN83), at http://www.cirrus.com/pubs/an83.pdf?DocumentID=260 from the Cirrus web

site. Check your schematic against the schematic checklist on page 4. If there is no link light (see item

4) then you have a hardware problem since the CS8900A should link with just power on.

Also, check your timing. TIOR2, TIOR3, TIOW2 and TIOW3 are the key timing parameters you must

meet. For example -- You must provide 10 ns of address/AEN stable before IOR# goes active.

6) What is the input and output capacitance of the CS8900A pins?

Input Capacitance CIN Max =10 pF

Output Capacitance COUT Max = 20 pF

AUG ‘02

AN205REV2

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Application Note 1

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Page 1 - Application Note

Page 2

AN2052Input/Output Capacitance CIO Max = 20 pF7) I need the algorithm to program the Hash Table Filter.You can download a sample program from the C

Page 3

AN205313) In the sample connection diagrams I see SHBE# and AEN connected to a chip select from the pro-cessor. Also, only 3 address lines are connect

Page 4

AN205419) Where can I find drivers for the CS8900A?Our CS8900A drivers are available on the Internet at: http://www.cirrus.com/Drivers/ethernet/ethern

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AN2055does not send out any link pulses on the 10BaseT port. The 10/100 hub is sending out Fast Link Pulses.The CS8900A doesn’t interpret Fast Link Pu

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AN2056Contacting Cirrus Logic SupportFor a complete listing of Direct Sales, Distributor, and Sales Representative contacts, visit the Cirrus Logic we

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Cirrus-logic AN205 Manuel d'utilisateur

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