SH7713 datasheet(687/904 Pages) RENESAS

687 / 904 page

Section 18 Ethernet Controller (EtherC)

Rev.1.50 Aug. 30, 2006 Page 647 of 860

REJ09B0288-0150

18.3.6

MAC Address High Register (MAHR)

MAHR is a 32 -bit readable/writable register that specifies the upper 32 bits of the 48-bit MAC

address. The settings in this register are normally made in the initialization process after a reset.

The MAC address setting must not be changed while the transmitting and receiving functions are

enabled. To switch the MAC address setting, 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 0 MA47 to

MA16

All 0

R/W

MAC Address Bits

These bits are used to set the upper 32 bits of the

MAC address.

If the MAC address is 01-23-45-67-89-AB

(hexadecimal), the value set in this register is

H'01234567.

18.3.7

MAC Address Low Register (MALR)

MALR is a 32-bit readable/writable register that specifies the lower 16 bits of the 48-bit MAC

address. The settings in this register are normally made in the initialization process after a reset.

The MAC address setting must not be changed while the transmitting and receiving functions are

enabled. To switch the MAC address setting, 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 16



All 0

Reserved

These bits are always read as 0. The write value

should always be 0.

15 to 0

MA15 to

MA0

All 0

R/W

MAC Address Bits 15 to 0

These bits are used to set the lower 16 bits of the MAC

address.

If the MAC address is 01-23-45-67-89-AB

(hexadecimal), the value set in this register is

H'000089AB.

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