LAN9250 datasheet(58/421 Pages) MICROCHIP

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LAN9250

DS00001913A-page 58

 2015 Microchip Technology Inc.

7.2

Hard-Straps

Hard-straps are latched upon Power-On Reset (POR) or pin reset (RST#) only. Unlike soft-straps, hard-straps always

have an associated pin and cannot be overridden by the EEPROM Loader. These straps are used as either direct con-

figuration values or as register defaults. Table 7-2 provides a list of all hard-straps and their associated pin. These

straps, along with their pin assignments are also fully defined in Section 3.0, "Pin Descriptions and Configuration," on

page 10.

EEE_enable_strap_1

Host MAC Energy Efficient Ethernet Enable Strap:

Config-

ures the default value of the Host MAC Energy Efficient Ether-

net (HMAC_EEE_ENABLE) bit in the Section 11.15.1, "Host

MAC Control Register (HMAC_CR)," on page 193.

Refer to the respective register definition sections for addi-

tional information.

EEE_enable_strap_1

(cont.)

PHY Energy Efficient Ethernet Enable Strap:

This strap

affects the default value of the following register bits:

• PHY Energy Efficient Ethernet Enable (PHYEEEEN) bit

of the PHYEDPD NLP / Crossover Time / EEE Configura-

tion Register (PHY_EDPD_CFG)

• 100BASE-TX EEE bit of the PHY EEE Capability Regis-

ter (PHY_EEE_CAP)

• 100BASE-TX EEE bit of the PHY EEE Advertisement

Note:

This has no effect when the PHY is in 100BASE-FX

mode.

Refer to the respective register definition sections for addi-

tional information.

TABLE 7-2:

HARD-STRAP CONFIGURATION STRAP DEFINITIONS

Strap Name

Description

Pins

eeprom_size_strap

EEPROM Size Strap:

Configures the EEPROM size range.

A low selects 1K bits (128 x 8) through 16K bits (2K x 8).

A high selects 32K bits (4K x 8) through 512K bits (64K x 8).

E2PSIZE

TABLE 7-1:

SOFT-STRAP CONFIGURATION STRAP DEFINITIONS (CONTINUED)

Strap Name

Description

Pin / Default Value

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