KSZ8873MLLI Micrel Inc, KSZ8873MLLI Datasheet - Page 87

• Manufacturer Part Number: KSZ8873MLLI
• Description: IC ETHERNET SWITCH 3PORT 64LQFP
• Manufacturer: Micrel Inc

Specifications of KSZ8873MLLI

• Controller Type: Ethernet Switch Controller
• Interface: MII
• Voltage - Supply: 1.8V, 2.5V, 3.3V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: *
• Package / Case: *
• Number Of Primary Switch Ports: 3
• Internal Memory Buffer Size: 32
• Fiber Support: No
• Integrated Led Drivers: Yes
• Phy/transceiver Interface: MII
• Power Supply Type: Analog
• Data Rate (typ): 10/100Mbps
• Vlan Support: Yes
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Mounting: Surface Mount
• Jtag Support: No
• Operating Supply Voltage (max): 1.89/3.465V
• Operating Temperature Classification: Industrial
• Data Rate: 100Mbps
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant

Micrel, Inc.
“All Port Dropped Packet” MIB counters are read using indirect memory access. The address offsets for these counters
are shown in the following table:
Examples:
Additional MIB Counter Information
“Per Port” MIB counters are designed as “read clear.” These counters will be cleared after they are read.
“All Port Dropped Packet” MIB counters are not cleared after they are accessed and do not indicate overflow or validity;
therefore, the application must keep track of overflow and valid conditions.
To read out all the counters, the best performance over the SPI bus is (160+3)*8*200 = 260ms, where there are 160
registers, 3 overheads, 8 clocks per access, at 5MHz. 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.
A high performance SPI master is also recommended to prevent counters overflow.
September 2009
1. MIB Counter Read (Read port 1 “Rx64Octets” Counter)
2. MIB Counter Read (Read port 2 “Rx64Octets” Counter)
3. MIB Counter Read (Read “Port1 TX Drop Packets” Counter)
Then
Then,
Then
Write to reg. 121 (0x79) with 0x1c
Write to reg. 122 (0x7A) with 0x0e
Read reg. 128 (0x80), overflow bit [31]
Read reg. 129 (0x81), counter bits [23:16]
Read reg. 130 (0x82), counter bits [15:8]
Read reg. 131 (0x83), counter bits [7:0]
Write to reg. 121 (0x79) with 0x1c
Write to reg. 122 (0x7A) with 0x2e
Read reg. 128 (0x80), overflow bit [31]
Read reg. 129 (0x81), counter bits [23:16]
Read reg. 130 (0x82), counter bits [15:8]
Read reg. 131 (0x83), counter bits [7:0]
Write to reg. 121 (0x79) with 0x1d
Write to reg. 122 (0x7A) with 0x00
Read reg. 130 (0x82), counter bits [15:8]
Read reg. 131 (0x83), counter bits [7:0]
Offset
0x100
0x101
0x102
0x103
0x104
0x105
Table 21. “All Port Dropped Packet” MIB Counters Indirect Memory Offsets
Port1 TX Drop Packets
Port2 TX Drop Packets
Port3 TX Drop Packets
Port1 RX Drop Packets
Port2 RX Drop Packets
Port3 RX Drop Packets
Counter Name
valid bit [30]
counter bits [29:24]
valid bit [30]
counter bits [29:24]
// Read MIB counters selected
// Trigger the read operation
// Read MIB counter selected
// Trigger the read operation
// Read MIB counter selected
// Trigger the read operation
Description
TX packets dropped due to lack of resources
TX packets dropped due to lack of resources
TX packets dropped due to lack of resources
RX packets dropped due to lack of resources
RX packets dropped due to lack of resources
RX packets dropped due to lack of resources
// If bit 31 = 1, there was a counter overflow
// If bit 30 = 0, restart (reread) from this register
// If bit 31 = 1, there was a counter overflow
// If bit 30 = 0, restart (reread) from this register
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KSZ8873MLL/FLL/RLL
M9999-092309-1.2