HD6417618 datasheet(264/646 Pages) RENESAS

264 / 646 page

Section 11 Ethernet Controller (EtherC)

Rev. 6.00 Jun. 12, 2007 Page 232 of 610

REJ09B0131-0600

11.3.1

EtherC Mode Register (ECMR)

ECMR is a 32-bit readable/writable register and specifies the operating mode of the Ethernet

controller. The settings in this register are normally made in the initialization process following a

reset.

The operating mode setting must not be changed while the transmitting and receiving functions

are enabled. To switch the operating mode, return the EtherC and E-DMAC to their initial states

by means of the SWR bit in EDMR before making settings again.

Bit

Bit Name

Initial

Value

R/W

Description

31 to 20



All 0

Reserved

These bits are always read as 0. The write value

should always be 0.

ZPF

R/W

0 time parameter PAUSE Frame Use Enable

0: Disables PAUSE frame control in which the TIME

parameter is 0.

The next frame is transmitted after the time

indicated by the Timer value has elapsed. When the

EtherC receives a PAUSE frame with the time

indicated by the Timer value set to 0, the PAUSE

frame is discarded.

1: Enables PAUSE frame control in which the TIME

parameter is 0.

A PAUSE frame with the Timer value set to 0 is

transmitted when the number of data in the receive

FIFO is less than the FCFTR value before the time

indicated by the Timer value has not elapsed. When

the EtherC receives a PAUSE frame with the time

indicated by the Timer value set to 0, the transmit

wait state is canceled.

PFR

R/W

PAUSE Frame Receive Mode

0: PAUSE frame is not transferred to the E-DMAC

1: PAUSE frame is transferred to the E-DMAC

RXF

R/W

Receive Flow Control Operating Mode

0: PAUSE frame detection function is disabled

1: Receive flow control function is enabled

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