KSZ8842-PMBL AM TR Micrel Inc, KSZ8842-PMBL AM TR Datasheet - Page 55

• Manufacturer Part Number: KSZ8842-PMBL AM TR
• Description: 2-Port Ethernet Switch/Repeater + 32-bit/33MHz PCI Bus Interface( )
• Manufacturer: Micrel Inc

Specifications of KSZ8842-PMBL AM TR

• 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
• 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): 3.5V
• Operating Supply Voltage (min): 3.1V
• Operating Temperature Classification: Industrial
• Data Rate: 100Mbps
• Lead Free Status / RoHS Status: Supplier Unconfirmed

Micrel, Inc.
Switch Global Control Register 3 (Offset 0x0406): SGCR3
This register contains the global control for the switch function.
October 2007
Rate: 148,800 frames/sec * 67 ms/interval * 1% = 99 frames/interval (approx.) = 0x63
15 – 8
2 – 0
Bit
Bit
3
2
1
0
7
6
5
4
3
Default
Default
0x63
000
0
0
0
1
0
0
0
0
0
R/W
R/W
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
Description
No excessive collision drop
1 = the switch will not drop packets when 16 or more collisions occur.
0 = the switch will drop packets when 16 or more collisions occur.
Huge packet support
1 = will accept packet sizes up to 1916 bytes (inclusive). This bit setting
will override setting from bit 1 of the same register.
0 = the max packet size will be determined by bit 1 of this register.
Legal Maximum Packet size check enable
0 = will accept packet sizes up to 1536 bytes (inclusive).
1 = 1522 bytes for tagged packets, 1518 bytes for untagged packets. Any
packets larger than the specified value will be dropped.
Priority Buffer reserve
1 = each ports pre-allocated 48 buffers, used exclusively for high priority
packets(q3,q2,q1). Effective only when multiple queues feature is turned
on.
0 = each ports pre-allocated 48 buffers, used for all priority packets
(q3,q2,q1,q0).
Description
Broadcast storm protection rate
Bit [7:0]
These bits, along with SGCR3[2:0], determines how many “64-byte
blocks” of packet data are allowed on an input port in a preset period. The
period is 67ms for 100Base-T or 670ms for 10Base-T. The default is 1%.
Repeater mode
1 = enable repeater mode
0 = normal mode
Note: The Repeater only supports 100Base-T, halfduplex modes. When
set to repeater mode, need to disable follow control in register MDTXC[9]
Switch host port duplex mode
1 = enable switch host interface half duplex mode.
0 = enable switch host interface full duplex mode. (Keep default value to
match DMA MAC to the full duplex mode only).
Switch host port flow control enable
1 = enable full duplex flow control on Switch host interface.
0 = disable full duplex flow control on Switch host interface.
Reserved (must be 0)
Null VID replacement
1 = replaces NULL VID with port VID(12 bits)
0 = no replacement for NULL VID
Broadcast storm protection rate
Bit [10:8]
These bits, along with SGCR3[15-8], determines how many “64-byte
blocks” of packet data allowed on an input port in a preset period. The
period is 67ms for 100Base-T or 670ms for 10Base-T. The default is 1%.
55
KSZ8842-PMQL/PMBL
M9999-100207-1.5