KSZ8995FQI Micrel Inc, KSZ8995FQI Datasheet - Page 41

• Manufacturer Part Number: KSZ8995FQI
• Description: 5 Port 10/100 Switch With PHY And Frame Buffers ( )
• Manufacturer: Micrel Inc

Specifications of KSZ8995FQI

• 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
• Data Rate (typ): 10/100Mbps
• Vlan Support: Yes
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Pin Count: 128
• Mounting: Surface Mount
• Jtag Support: No
• Operating Temperature Classification: Industrial
• Data Rate: 100Mbps
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-3300

Semptember 2008
SPIS_N
SPIS_N
MII Management Interface (MIIM)
A standard MIIM interface is provided for all five PHY devices in the KS8995MA/FQ. An external device with
MDC/MDIO capability is able to read PHY status or to configure PHY settings. The device is able to meet IEEE
specification of 2.5MHz MDC clock. For details on the MIIM interface standard please reference the IEEE 802.3
specification (section 22.2.4.5). The MIIM interface does not have access to all the configuration registers in the
KS8995MA/FQ. It can only access the standard MII registers. See “MIIM Registers.” The SPI interface, on the other
hand, can be used to access the entire KS8995MA/FQ feature set.
SPIS_N
SPIS_N
SPIC
SPID
SPIQ
SPIC
SPID
SPIQ
SPIQ
SPIQ
SPIC
SPID
SPIC
SPID
D7
X
X
D7
X
D6
X
0
D6
0
D5
X
0
D5
READ COMMAND
Byte 2
0
D4
0
X
D4
Byte 2
WRITE COMMAND
0
D3
0
X
D4
0
D2
X
0
D2
0
D1
X
0
D1
0
D0
X
1
D0
Figure 11. SPI Multiple Write
Figure 12. SPI Multiple Read
1
D7
1
X
D7
0
A7 A6 A5 A4 A3 A2 A1 A0
D6
X
D6
A7 A6 A5 A4 A3 A2 A1 A0
D5
X
D5
READ ADDRESS
Byte 3 ...
D4
X
Byte 3 ...
D4
WRITE ADDRESS
41
D3
X
D3
D2
X
D2
D1
X
D1
D0
X
D0
D7
X
D7
X
D7
D7
D6
X
D6
X
D6
D6
D5
X
D5
Byte 1
X
Byte N
D5
D5
D4
X
D4
X
D3
D4
D4
Byte N
X
Byte 1
D3
X
D2
D3
D3
X
D2
X
M9999-091508
D1
D2
D2
X
D1
X
D0
D1
D1
X
D0
X
D0
D0