KSZ9021RL View Datasheet(PDF) - Micrel

Part Name

Description

Manufacturer

KSZ9021RL

Gigabit Ethernet Transceiver with RGMII Support

Micrel 

Micrel, Inc.

KSZ9021RL/RN

The following reset circuit is recommended for applications where reset is driven by another device (e.g., CPU or FPGA).

At power-on-reset, R, C and D1 provide the necessary ramp rise time to reset the KSZ9021RL/RN device. The

RST_OUT_n from CPU/FPGA provides the warm reset after power up.

DVDDH

KSZ9021RL/RN

RESET_N

D1

C 10uF

R 10K

D2

CPU/FPGA

RST_OUT_n

D1, D2: 1N4148

Figure 10. Recommended Reset Circuit for Interfacing with CPU/FPGA Reset Output

Reference Circuits – LED Strap-in Pins

The pull-up and pull-down reference circuits for the LED2/PHYAD1 and LED1/PHYAD0 strapping pins are shown in the

following figure.

DVDDH

Pull-up

10ΚΩ

220Ω

KSZ9021RL/RN

LED pin

Pull-down

KSZ9021RL/RN

LED pin

DVDDH

220Ω

1ΚΩ

February 13, 2014

Figure 11. Reference Circuits for LED Strapping Pins

54

Revision 1.2

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