Digi NS9750 - Manual (Page 374)

E t h e r n e t C o n t r o l a n d S t a t u s r e g i s t e r s
3 5 0 N S 9 7 5 0 H a r d w a r e R e f e r e n c e
D00 R/W RXEN 0 Receive enable
Set this bit to 1 to allow the MAC receiver to receive
frames.
Bits Access Mnemonic Reset Description
Table 211: MAC Configuration Register #1