KSZ8893FQL datasheet(21/109 Pages) MICROCHIP

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KSZ8893FQL

DS00003038A-page 20

 2019 Microchip Technology Inc.

3.1.2

10BASE-FL OPERATION

10BASE-FL operation is supported on port 1 of the KSZ8893FQL. It conforms to clause 15 and 18 of the IEEE802.3

Standard for 10BASe-FL fiber operation. Refer to the Standard for details.

In a typical application, the KSZ8893FQL provides media conversion from 10BASE-FL fiber on port 1 to 10BASE-T cop-

per on port 2. Alternatively, port 2 can be substituted with port 3 to directly connect to an external MAC.

3.1.2.1

Physical Interface

For 10BASE-FL operation, port 1 interfaces with an external fiber module to drive 850 nm fiber optic links. The interface

connections between the KSZ8893FQL and fiber module are single-ended (common mode). 10BASE-FL signal trans-

mission and reception are done on TXM1 (pin 49) and RXM1 (pin 46), respectively. Refer to Microchip’s reference sche-

matic for recommended interface circuit and termination.

3.1.2.2

Enabling 10BASE-FL Mode

To enable 10BASE-FL mode, tie FXSD1 (pin 44) high to +3.3V and MUX2 (pin 41) low-to-ground. Port 1 should also be

configured with auto-negotiation disabled, forced to 10 Mbps for the speed, and set to either half- or full-duplex. Option-

ally, flow control can be enabled to send out PAUSE frames in full-duplex mode.

The 10BASE-FL settings use the same strapping pins, MIIM registers and port registers as 10BASE-T copper. These

settings are summarized in Table 3-4.

PDD#

IPU

Power-Down Detect: Used by terminal MC to detect a power-down con-

dition or indicate a failure has occurred.

1 = Normal operation

0 = Power down detected

After detecting a high-to-low transition on this pin, the KSZ8893FQL

then sends out an “Indicate Terminal MC Condition” OAM frame with

the S0 status bit set to ‘1’ to inform the center MC that a power down

condition or failure has occurred on the terminal MC side.

If this pin is implemented, PWRDN (pin 36) needs to be deasserted

(pulled up).

P1FST

OPU

Drives low to indicate fault conditions (far-end fault detected, link part-

ner’s fiber or UTP port down), or MC loopback mode. This pin has 8 mA

drive and can directly drive a LED.

P1CRCD

IPD

Used by terminal MC for MC loopback – strap-in pin to select:

1 = Drop OAM frames and Ethernet frames with the following errors:

CRC, undersize, oversize. Loopback Ethernet frames with only good

CRC and valid length.

0 = Drop OAM frames only. Loopback all Ethernet frames including

those with errors.

P1LPBM

IPD

Used by terminal MC for MC loopback – strap-in pin to select:

1 = Perform MC loopback at PHY of port 1

0 = Perform MC loopback at MAC of port 2

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