Specifications

Micrel, Inc.
KSZ8895MQ/RQ/FMQ
Pin Description (Continued)
Pin Number Pin Name Type
(1)
Port Pin Function
(2)
39 FXSD4 IPD 4
FMQ: Fiber signal detect pin for Port 4.
MQ/RQ: no connection.
40 NC NC No connect.
41 NC NC No connect.
42 NC NC No connect.
43 NC NC No connect.
44 NC NC No connect.
45 NC NC No connect.
46 NC NC No connect.
47 PWRDN_N IPU Full-chip power down. Active low.
48 INTR_N OPU Interrupt. This pin is Open-Drain output pin.
49 GNDD GND Digital ground.
50 VDDC P 1.2V digital core V
DD
.
51 PMTXEN IPD 5 PHY[5] MII/RMII transmit enable.
52 PMTXD3 IPD 5
MQ/FMQ: PHY[5] MII transmit bit 3.
RQ: no connection for RMII.
53 PMTXD2 IPD 5
MQ/FMQ: PHY[5] MII transmit bit 2.
RQ: no connection for RMII.
54 PMTXD1 IPD 5 PHY[5] MII/RMII transmit bit 1.
55 PMTXD0 IPD 5 PHY[5] MII/RMII transmit bit 0.
56 PMTXER IPD 5 MQ/FMQ: PHY[5] MII transmit error. RQ: no connection for RMII.
57 PMTXC/PMREFCLK I/O 5
MQ/FMQ: Output PHY[5] MII transmit clock
RQ: Input PHY[5] RMII reference clock, 50MHz ±50ppm, the
50MHz clock comes from PMRXC Pin 60.
58 GNDD GND Digital ground.
59 VDDIO P 3.3V, 2.5V or 1.8V digital V
DD
for digital I/O circuitry.
60 PMRXC I/O 5
MQ/FMQ: Output PHY[5] MII receive clock.
RQ: Output PHY[5] RMII reference clock, this clock is used when
opposite doesn’t provide RMII 50MHz clock or the system doesn’t
provide an external 50MHz clock for the P5-RMII interface.
61 PMRXDV/PMCRSDV IPD/O 5
MQ/FMQ: PMRXDV is for PHY[5] MII receive data valid.
RQ: PMCRSDV is for PHY[5] RMII Carrier Sense/Receive Data
Valid Output.
62 PMRXD3 IPD/O 5
MQ/FMQ: PHY[5] MII receive bit 3.
RQ: no connection for RMII.
Strap option:
PD (default) = enable flow control.
PU = disable flow control.
63 PMRXD2 IPD/O 5
MQ/FMQ: PHY[5] MII receive bit 2.
RQ: no connection for RMII.
Strap option:
PD (default) = disable back pressure.
PU = enable back pressure.
March 12, 2014
17
Revision 1.7