An205 – Cirrus Logic AN205 User Manual
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AN205
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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,
d 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?
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
. 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.