NXP Semiconductors /LPC408x_7x /ETHERNET /MCFG

Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text

Interpret as MCFG

31 2827 2423 2019 1615 1211 87 43 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (SCANINC)SCANINC 0 (SUPPPREAMBLE)SUPPPREAMBLE 0CLOCKSEL 0RESERVED0 (RESETMIIMGMT)RESETMIIMGMT 0RESERVED

Description

MII Mgmt Configuration register.

Fields

SCANINC

SCAN INCREMENT. Set this bit to cause the MII Management hardware to perform read cycles across a range of PHYs. When set, the MII Management hardware will perform read cycles from address 1 through the value set in PHY ADDRESS[4:0]. Clear this bit to allow continuous reads of the same PHY.

SUPPPREAMBLE

SUPPRESS PREAMBLE. Set this bit to cause the MII Management hardware to perform read/write cycles without the 32-bit preamble field. Clear this bit to cause normal cycles to be performed. Some PHYs support suppressed preamble.

CLOCKSEL

CLOCK SELECT. This field is used by the clock divide logic in creating the MII Management Clock (MDC) which IEEE 802.3u defines to be no faster than 2.5 MHz. Some PHYs support clock rates up to 12.5 MHz, however. The AHB bus clock (HCLK) is divided by the specified amount. Refer to Table 160 below for the definition of values for this field.

RESERVED

Unused

RESETMIIMGMT

RESET MII MGMT. This bit resets the MII Management hardware.

RESERVED

Unused

Links

()