KSZ8995MA B3 Micrel Inc, KSZ8995MA B3 Datasheet - Page 39

• Manufacturer Part Number: KSZ8995MA B3
• Manufacturer: Micrel Inc

Specifications of KSZ8995MA B3

• 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 Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Compliant

Semptember 2008
To use the KS8995MA/FQ SPI:
1. At the board level, connect KS8995MA/FQ pins as follows:
2. Set the input signals PS[1:0] (pins 113 and 114, respectively) to “10” to set the serial configuration to SPI slave
3. Power up the board and assert a reset signal. After reset wait 100µs, the start switch bit in Register 1 will be set
4. Write configuration to registers using a typical SPI write data cycle as shown in Figure 9 or SPI multiple write as
5. Registers can be read and configuration can be verified with a typical SPI read data cycle as shown in Figure 10
6. After configuration is written and verified, write a ‘1’ to Register 1 bit 0 to begin KS8995MA/FQ operation.
KS8995MA/FQ Pin
mode.
to ‘0’. Configure the desired settings in the KS8995MA/FQ before setting the start register to ‘1.'
shown in Figure 11. Note that data input on SPID is registered on the rising edge of SPIC.
or a multiple read as shown in Figure 12. Note that read data is registered out of SPIQ on the falling edge of
SPIC.
Number
112
110
111
109
KS8995MA/FQ Signal
SPIS_N
Name
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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