Datasheet

Micrel, Inc. KS8995MA/FQ
October 2011 41 M9999-102611-3.0
Configuration Interface
The KS8995MA/FQ can function as a managed switch or unmanaged switch. If no EEPROM or micro-controller exists,
the KS8995MA/FQ will operate from its default setting. Some default settings are configured via strap in options as
indicated in the following tables.
Pin # Pin Name PU/PD
(1)
Description
(1)
1 MDI-XDIS Ipd
Disable auto MDI/MDI-X.
PD = (default) = normal operation
PU = disable auto MDI/MDI-X on all ports.
45 MUX1 NC
Factory test pins. MUX1 and MUX2 should be left unconnected for normal operation.
46 MUX2 NC
Mode MUX1 MUX2
Normal Operation NC NC
62 PMRXD3 Ipd/O
PHY[5] MII receive bit 3. Strap option: PD (default) = enable flow control; PU = disable
flow control.
63 PMRXD2 Ipd/O
PHY[5] MII receive bit 2. Strap option: PD (default) = disable back pressure; PU = enable
back pressure.
64 PMRXD1 Ipd/O
PHY[5] MII receive bit 1. Strap option: PD (default) = drop excessive collision packets;
PU = does not drop excessive collision packets.
65 PMRXD0 Ipd/O
PHY[5] MII receive bit 0. Strap option: PD (default) = disable aggressive back-off
algorithm in half-duplex mode; PU = enable for performance enhancement.
66 PMRXER Ipd/O
PHY[5] MII receive error. Strap option: PD (default) = 1522/1518 bytes; PU = packet size
up to 1536 bytes.
67 PCRS Ipd/O
PHY[5] MII carrier sense/strap option for port 4 only. PD (default) = force half-duplex if
auto-negotiation is disabled or fails. PU = force full-duplex if auto-negotiation is disabled
or fails. Refer to register 76.
68 PCOL Ipd/O
PHY[5] MII collision detect/strap option for port 4 only. PD (default) = no force flow
control. PU = force flow control. Refer to register 66.
80 SMRXD3 Ipd/O
Switch MII receive bit 3. Strap option: PD (default) = disable switch MII full-duplex flow
control; PU = enable switch MII full-duplex flow control.
81 SMRXD2 Ipd/O
Switch MII receive bit 2. Strap option: PD (default) = switch MII in full-duplex mode; PU =
switch MII in half-duplex mode.
82 SMRXD1 Ipd/O
Switch MII receive bit 1. Strap option: PD (default) = switch MII in 100Mbps mode; PU =
switch MII in 10Mbps mode.
83 SMRXD0 Ipd/O
Switch MII receive bit 0. Strap option: LED mode PD (default) = mode 0; PU = mode 1.
See “Register 11.”
Mode 0 Mode 1
LEDX_2 Lnk/Act 100Lnk/Act
LEDX_1 Fulld/Col 10Lnk/Act
LEDX_0 Speed Fulld
Note:
1. NC = No connect.
Ipd = Input w/internal pull-down.
Ipd/O = Input w/internal pull-down during reset, output pin otherwise.
Fulld = Full duplex.