KS8993F-EVAL Micrel Inc, KS8993F-EVAL Datasheet - Page 85

• Manufacturer Part Number: KS8993F-EVAL
• Description: EVAL KIT EXPERIMENTAL KS8993F
• Manufacturer: Micrel Inc

Specifications of KS8993F-EVAL

• Lead Free Status / RoHS Status: Not applicable / Not applicable

3) MIB counter read (read “Port1 TX Drop Packets” counter)
NOTES:
Micrel, Inc.
May 2006
1. Both “Per Port” and “All Port Dropped Packet” MIB Counters do not indicate overflow. The application must
2. “All Port Dropped Packet” MIB Counters do not indicate if count is valid. The application must keep track of
3. To read out all the counters, the best performance over the SPI bus is (160+3)*8*200 = 260 ms, where there
4. A high performance SPI master is recommended to prevent counters overflow.
5. “Per Port” MIB Counters are designed as “read clear”. These counters will be cleared after they are read.
6. “All Port Dropped Packet” MIB counters are not cleared after they are read.
Write to reg. 110 with 0x1d (read MIB counter selected)
Write to reg. 111 with 0x00 (trigger the read operation)
Then
Read reg. 119 (counter value 15-8)
Read reg. 120 (counter value 7-0)
keep track of overflow conditions for these counters.
valid conditions for these counters.
are 160 registers, 3 overheads, 8 clocks per access, at 5 MHz. In the heaviest condition, the counters will
overflow in 2 minutes. It is recommended that the software read all the counters at least every 30 seconds.
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