Datasheet

ManualsBrandsMicrochip ManualsIntegrated Circuits (ICs)5-Port Managed Ethernet Switch Ethernet/SPI/MAC/PHY/MII/RMII/RGMII/GMII LQFP-80

KSZ8795CLX

DS00002112B-page 10  2016-2017 Microchip Technology Inc.

62 LED2_1 Ipu/O 2 Port 2 LED Indicator 1:

See Global Register 11 bits [5:4] for details.

Strap Option: Port 5 GMII/MII and RMII mode select

When Port 5 is GMII/MII mode:

PU = GMII/MII is in GMAC/MAC mode. (Default)

PD = GMII/MII is in GPHY/PHY mode.

Note: When set GMAC5 GMII to GPHY mode, the CRS

and COL pins will change from the input to output.

When set MII to PHY mode, the CRS, COL, RXC

and TXC pins will change from the input to output.

When Port 5 is RMII mode:

PU = Clock mode in RMII, using 25MHz OSC clock and provide

50 MHz RMII clock from pin RXC5.

PD = Normal mode in RMII, the TXC5/REFCLKI5 pin on the

port 5 RMII will receive an external 50 MHz clock

Note: Port 5 also can use either an internal or external

clock in RMII mode based on this strap pin or the set-

ting of the Register 86 (0x56) bit[7].

63 LED2_0 Ipu/O 2 Port 2 LED Indicator 0:

See Global Register 11 bits [5:4] for details.

Strap Option: REFCLKO enable

PU = REFCLK_O (25 MHz) is enabled. (Default)

PD = REFCLK_O is disabled.

Note: It is better to disable this 25 MHz clock if not provid-

ing an extra 25 MHz clock for the system.

64 LED1_1 Ipu/O 1 Port 1 LED Indicator 1:

See Global Register 11 bits [5:4] for details.

Strap Option: PLL Clock source select

PU = Still use 25 MHz clock from XI/XO pin even though it is in

Port 5 RMII normal mode.

PD = Use external clock from pin TXC5 in Port 5 RMII normal

mode.

Note: If received clock in Port 5 RMII normal mode has

large clock jitter, one can select the 25 MHz crystal/

oscillator as the switch’s clock source.

65 LED1_0 Ipu/O 1 Port 1 LED Indicator 0:

See Global Register 11 bits [5:4] for details.

Strap Option: Speed select in GMII/RGMII

PU = 1Gbps in GMII/RGMII.(Default)

PD = 10/100Mbps in GMII/RGMII.

Note: Programmable through internal registers also.

66 SPIQ Ipd/O All SPI Serial Data Output in SPI Slave Mode:

Strap Option: Serial bus configuration.

PD = SPI slave mode.

PU = MDC/MDIO mode.

Note: An external pull-up or pull-down resistor is required.

TABLE 2-1: SIGNALS - KSZ8795CLX (CONTINUED)

Number

Name

Type

Note 2-1

Port Description