KSZ8995M A4 Micrel Inc, KSZ8995M A4 Datasheet - Page 36

• Manufacturer Part Number: KSZ8995M A4
• Manufacturer: Micrel Inc

Specifications of KSZ8995M A4

• Number Of Primary Switch Ports: 5
• Internal Memory Buffer Size: 64
• Operating Supply Voltage (typ): 1.8/2.5/3.3V
• Fiber Support: Yes
• Integrated Led Drivers: Yes
• Phy/transceiver Interface: MII/SNI
• Power Supply Type: Analog/Digital
• Package Type: PQFP
• Data Rate (typ): 10/100Mbps
• Vlan Support: Yes
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Pin Count: 128
• Mounting: Surface Mount
• Jtag Support: No
• Operating Supply Voltage (max): 1.9/2.6/3.6V
• Operating Supply Voltage (min): 1.7/2.4/3V
• Operating Temperature Classification: Commercial
• Data Rate: 100Mbps
• Lead Free Status / RoHS Status: Compliant

KS8995M
To use the KS8995M SPI:
M9999-062309
1. At the board level, connect KS8995M pins as follows:
KS8995M
Pin Number
112
110
111
109
2. Set the input signals PS[1:0] (pins 113 and 114 respectively) to “10” to set the serial configuration to SPI slave mode.
3. Power up the board and assert a reset signal. After reset, the start switch bit in register 1 will be set to ‘0’. Configure
4. Write configuration to registers using a typical SPI write data cycle as shown in Figure 8 or SPI multiple write as shown
5. Registers can be read and configuration can be verified with a typical SPI read data cycle as shown in Figure 9 or
6. After configuration is written and verified, write a ‘1’ to register 1 bit 0 to begin KS8995M operation.
the desired settings in the KS8995M before setting the start register to ‘1’.
in Figure 10. Note that data input on SPID is registered on the rising edge of SPIC.
a multiple read as shown in Figure 11. Note that read data is registered out of SPIQ on the falling edge of SPIC.
KS8995M
Signal Name
SPIS_N
SPIC
SPID
SPIQ
Table 9. SPI Connections
Microprocessor Signal
Description
SPI Slave Select
SPI Clock
Master Out Slave Input
Master In Slave Output
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Micrel, Inc.
June 2009