Cirrus-logic AN205 Manual de usuario descargar pdf (Pagina 2)

AN205

Input/Output Capacitance CIO Max = 20 pF

7) I need the algorithm to program the Hash Table Filter.

You can download a sample program from the CS8900A drivers page. Go to the Cirrus web site,

http://www.cirrus.com/Drivers/ethernet/ethernet.cfm. Download hash.zip.

8) What are Theta J/A and Theta J/C for the CS8900A?

Theta J/A = 34.9 C/w (0 ms air flow) Nominal

Theta J/C = 12.8 C/w (0 ms air flow) Nominal

9) Does Cirrus supply MAC addresses?

No. You need to get MAC address from IEEE. Paste the following link in your browser window:

http://standards.ieee.org/regauth/oui/index.shtml to apply for a company identifier from IEEE. A

MAC address (sometimes called an Individual Address) is made up of a 3 byte company identifier and

a 3 byte number assigned by the company.

That is IEEE will give your company a unique 3 byte number. Then for every device manufactured

your company will assign the last 3 bytes of the number.

10) Do I need an EEPROM in my design?

No. When there is no EEPROM then the CS8900A will default to I/O Base Address 0x0300. You will

need to store the MAC address somewhere in FLASH or other non-volatile memory.

11) Do you have a sample connection diagram for my processor?

There are several connection diagrams shown in the application note, Crystal LAN

™

CS8900A

Ethernet Controller Technical Reference Manual, (AN83) at

http://www.cirrus.com/pubs/an83.pdf?DocumentID=260. These include a 68302, ARM 7 and Hitachi

SH3. There are so many processors that it is impossible to have a sample for every one. Please read

“CS8900A: Connecting to non-ISA Bus Systems” in Application Note 83.

12) What is the MTBF for the CS8900A?

We have Op-Life qualification data for rev B, C, and, D of CS8900A.

Rev B: 1161 devices, 500 hours, 0 failure. → 26 FIT → 38,400,000 MTBF

Rev C: 315 devices, 168 hours, 0 failure. → 280 FIT → 3,570,000 MTBF

Rev D: 315 devices, 168 hours, 0 failure. → 280 FIT → 3,570,000 MTBF

Rev C/D combined: 730 devices, 168 hours, 0 failures. → 140 FIT → 7,140,000 MTBF

Rev B has much better FIT result because the production qualification plan for rev C/D did not require

as high of a sample size and stress duration.

There were only minor metal revision changes from Rev B to Rev D. Rev D is the current shipping

version.

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Cirrus-logic AN205 Manual de usuario Pagina 2