KSZ8463_eval_bd_user_guide_1.1.docx
Micrel, Inc.
July 17, 2013
Confidential
Rev. 1.1
11/16
The KSZ8463RL/FRL filters error frames, and thus does not implement the RX_ER output signal. To
detect error frames from RMII PHY devices, the TX_ER input signal of the KSZ8463RL/FRL is connected
to the RX_ER output signal of the RMII PHY device.
Collision detection is implemented in accordance with the RMII Specification.
In RMII mode, tie MII signals (TXD [3:2], RXD [3:2] and TX_ER) to ground if they are not used.
The KSZ8463RL/FRL can interface to either RMII PHY or RMII MAC devices. The RMII MAC device
allows two KSZ8463RL/FRL devices to be connected back-to-back.
3.4 GPIO pins
The KSZ8463 has up to 12 General Purpose I/O (GPIO) pins which are available on the evaluation board
at connectors J15 and J16. The KSZ8463RL has all 12 GPIO pins available. Three GPIO pins of the
KSZ8463ML are shared with Port1/2 LED activity signals and are user programmable. By default the LED
signals are enabled, therefore 9 GPIO pins are available. If more than 9 GPIO pins are required, the user
needs to program IOMXSEL register (0x0D6) as follows:
IOMXSEL register
(0x0D6)
Description
Setting
Bit 10
Selection of P2LED1 or GPIO9
1 = This pin is used for P2LED1 (default)
0 = This pin is used for GPIO9
Bit 9
Selection of P2LED0 or GPIO10
1 = This pin is used for P2LED0 (default)
0 = This pin is used for GPIO10
Bit 8
Selection of P1LED1 or GPIO7
1 = This pin is used for P1LED1 (default)
0 = This pin is used for GPIO7
Table 7 GPIO pin selection for KSZ8463ML
GPIO signals are on the odd numbered pins of connectors J15 and J16. All even numbered pins are GND
connections. GPIO7, 9 and 10 pins are connected to jumpers JP36, 37 and 38 respectfully.
For the KSZ8463RL device, pins 1 and 2 of all three jumpers need to be closed in order to make GPIO7, 9
and 10 available at the GPIO headers. In case of KSZ8463ML, GPIO7, 9 and 10 are Port1/2 LED activity
signals by default and no strapping is needed. If the user enables GPIO functionality instead, pins 2 and 3
of the corresponding jumpers have to be closed.
The GPIO pins can be used for any general purpose I/O as well as to support IEEE1588 PTP
functionality.
