Rainbow Electronics W90N740 - Manual (Page 91)

W90N740
Publication Release Date: November 26, 2004
- 87 - Revision A4
MAC Command Register (MCMDR_0, MCMDR_1)
The MAC command register provides global control information for the MAC. MAC command register
settings affect both transmission and reception. The user can also control transmit and receive operation
separately. To select customized operating features, users should write this register during system
initialization. This way, users will not need to write or read it again during normal operation. However, if
users change setting during operation, the updated setting will take effect after the current frame is
completed.
Register Address R/W Description Reset Value
MCMDR_0 0xFFF0.308
C
R/W MAC Command Register 0x0000.0000
MCMDR_1 0xFFF0.388
C
R/W MAC Command Register 0x0000.0000
31 30 29 28 27 26 25 24
Reserved Reserved LAN
23 22 21 20 19 18 17 16
LPCS EnRMII LBK OPMOD EnMDC FDUP Reserved SDPZ
15 14 13 12 11 10 9 8
Reserved NDEF TXON
7 6 5 4 3 2 1 0
Reserved SPCRC AEP ACP ARP ALP RXON
Reserved [25]:
Default value: 0
LAN [24]: LAN Port Setting Mode
Default value: 0
Set this bit to set this EMC port as a LAN port, and clear this bit to set the EMC port as a WAN port.
The S/W program must initial an EMC as a LAN port, and another EMC as a WAN port (for example,
EMC 0 as a LAN port and EMC 1 as a WAN port) to let the NAT accelerator work properly.
LPCS [23]: Low Pin Count Package Switch
Always set: 0
EnRMII [22]: Enable RMII
Default value: 0
Set this bit to select RMII interface.