KSZ8842-16MQL Micrel Inc, KSZ8842-16MQL Datasheet - Page 56

• Manufacturer Part Number: KSZ8842-16MQL
• Description: IC SWITCH 10/100 16BIT 128PQFP
• Manufacturer: Micrel Inc

Specifications of KSZ8842-16MQL

• Data Rate: 100Mbps
• Controller Type: Ethernet Switch Controller
• Interface: PCI
• Voltage - Supply: 3.1 V ~ 3.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• No. Of Ports: 1
• Ethernet Type: IEEE 802.3u
• Supply Current: 122mA
• Supply Voltage Range: 3.1V To 3.5V
• Operating Temperature Range: 0°C To +70°C
• Digital Ic Case Style: QFP
• No. Of: RoHS Compliant
• Number Of Primary Switch Ports: 2
• Internal Memory Buffer Size: 32
• Operating Supply Voltage (typ): 3.3V
• Fiber Support: Yes
• Integrated Led Drivers: Yes
• Phy/transceiver Interface: MII
• 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): 3.5V
• Operating Supply Voltage (min): 3.1V
• Operating Temperature Classification: Commercial
• Interface Type: PCI
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 576-1634 - BOARD EVALUATION KSZ8842-16MQL
• Current - Supply: -
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: 576-1478-5

These three registers value for Host MAC address 01:23:45:67:89:AB will be held as below:
MARL[15:0] = 0x89AB
MARM[15:0] = 0x4567
MARH[15:0] = 0x0123
The following table shows the register bit fields.
Bank 2 Host MAC Address Register Middle (0x02): MARM
The middle word of Host MAC address.
The following table shows the register bit fields.
Bank 2 Host MAC Address Register High (0x04): MARH
The high word of Host MAC address.
The following table shows the register bit fields.
Bank 3 On-Chip Bus Control Register (0x00): OBCR
This register controls the on-chip bus speed for the KSZ8842M. It is used for power management when the external host
CPU is running at a slow frequency. The default of the on-chip bus speed is 125 MHz without EEPROM. When the
external host CPU is running at a higher clock rate, the on-chip bus should be adjusted for the best performance.
Micrel Confidential
Bit
15-0
Bit
15-0
Bit
15-0
Bit
15-2
1-0
November 2005
Default Value
-
Default Value
-
Default Value
-
Default Value
-
0x0
R/W
RW
R/W
RW
R/W
RW
R/W
RO
RW
Description
MARL MAC Address Low
The least significant word of the MAC address.
Description
MARM MAC Address Middle
The middle word of the MAC address.
Description
MARH MAC Address High
The Most significant word of the MAC address.
Description
Reserved
OBSC On-Chip Bus Speed Control
00: 125MHz.
01: 62.5MHz.
10: 41.66MHz.
11: 25MHz.
Note: When external EEPROM is enabled, the bit 1 in Configparm word (0x6H) is
used to contol this speed as below:
Bit 1 = 0 , this value will be 00 for 125 MHz.
Bit 1 = 1 , this value will be 11 for 25 MHz.
(User still can write these two bits to change speed after EEPROM data loaded)
56
KSZ8842-16/32 MQL/MVL
Rev. 1.4