KSZ8995M Micrel Inc, KSZ8995M Datasheet - Page 42

• Manufacturer Part Number: KSZ8995M
• Description: IC SWITCH 10/100 5PORT 128PQFP
• Manufacturer: Micrel Inc

Specifications of KSZ8995M

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• 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: Lead free / RoHS Compliant
• For Use With: 576-1607 - BOARD EVAL EXPERIMENT KSZ8995MA
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: 576-1038

KS8995M
M9999-120403
Address
1
0
Register 5 (0x05): Global Control 3
7
6
5
4
3-2
1
0
Register 6 (0x06): Global Control 4
7
6
Name
Legal Maximum Packet
size check disable
Priority Buffer reserve
802.1q VLAN enable
IGMP snoop enable on
Switch MII interface
Enable direct mode on
Switch MII interface
Enable pre tag on
Switch MII interface
Priority Scheme select
Enable “tag” mask
Sniff mode select
Switch MII back
pressure enable
Switch MII half
duplex mode
Description
1, will accept packet sizes up to 1536 bytes (inclusive).
0, 1522 bytes for tagged packets (not including packets
with STPID from CPU to ports 1-4), 1518 bytes for
untagged packets. Any packets larger than the specified
value will be dropped.
1, Each output queue is pre-allocated 48 buffers,
used exclusively for high priority packets. It is
recommended to enable this when priority queue
feature is turned on.
0, No reserved buffers for high priority packets.
1, 802.1q VLAN mode is turned on. VLAN table needs
to set up before the operation.
0, 802.1q VLAN is disabled.
1, IGMP snoop enabled. All the IGMP packets will be
forwarded to switch MII port.
0, IGMP snoop disabled.
1, direct mode on port 5. This is a special mode for the
switch MII interface. Using preamble before MRXDV to
direct switch to forward packets, bypassing internal
look-up.
0, normal operation.
1, packets forwarded to switch MII interface will be
pre-tagged with the source port number.
(preamble before MRXDV)
0, normal operation.
00 = always deliver high priority packets first.
01 = deliver high/low packets at ratio 10/1.
10 = deliver high/low packets at ratio 5/1.
11 = deliver high/low packets at ratio 2/1.
1, the last 5 digits in the VID field are used as a mask
to determine which port(s) the packet should be
forwarded to.
0, no tag masks.
1, will do Rx AND Tx sniff (both source port and
destination port need to match).
0, will do Rx OR Tx sniff (Either source port or
destination port needs to match). This is the mode
used to implement Rx only sniff.
1, enable half-duplex back pressure on switch MII
interface.
0, disable back pressure on switch MII interface.
1, enable MII interface half-duplex mode.
0, enable MII interface full-duplex mode.
42
Mode
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default
Pin PMRXER
strap option.
Pull-down (0):
1518/1522 byte
packets. Pull-up
(1): 1536 byte
packets.
Note: PMRXER
has internal pull
down.
0
0
0
0
0
00
0
0
0
Pin SMRXD2 strap
option. Pull-down
(0): Full duplex
mode. Pull-up
(1): Half duplex
mode Note:
SMRXD2 has
internal pull down.
December 2003
Micrel