Rainbow Electronics AT75C220 - Manual (Page 37)

AT75C220
37
MAC Network Control Register
Register Name: ETH_CTL
Access Type: Read/write
Reset Value: 0x0
• LB
Loopback. Optional.
• LBL
Loopback local. Connects TXD to RXD, TXEN to RXDV, forces full duplex and drives RXCLK and TXCLK with HCLK
divided by 4.
• RE
Receive enable. When set, enables the Ethernet MAC to receive data.
• TE
Transmit enable. When set, enables the Ethernet transmitter to send data.
0x74 ETH_RJB Receive jabbers Read/write 0x0
0x78 ETH_USF Undersize frames Read/write 0x0
0x7C ETH_SQEE SQE test errors Read/write 0x0
0x80 ETH_DRFC Discarded RX frames Read/write 0x0
Address Registers
0x90 ETH_HSH Hash Register [63:32] Read/write 0x0
0x94 ETH_HSL Hash Register [31:0] Read/write 0x0
0x98 ETH_SA1L Specific address 1, first 4 bytes Read/write 0x0
0x9C ETH_SA1H Specific address 1, last 2 bytes Read/write 0x0
0xA0 ETH_SA2L Specific address 2, first 4 bytes Read/write 0x0
0xA4 ETH_SA2H Specific address 2, last 2 bytes Read/write 0x0
0xA8 ETH_SA3L Specific address 3, first 4 bytes Read/write 0x0
0xAC ETH_SA3H Specific address 3, last 2 bytes Read/write 0x0
0xB0 ETH_SA4L Specific address 4, first 4 bytes Read/write 0x0
0xB4 ETH_SA4H Specific address 4, last 2 bytes Read/write 0x0
31 30 29 28 27 26 25 24
– – – – – – – –
23 22 21 20 19 18 17 16
– – – – – – – –
15 14 13 12 11 10 9 8
– – – – – – – BP
7 6 5 4 3 2 1 0
WES ISR CSR MPE TE RE LBL LB
Table 15. Ethernet MAC Register Map (Continued)
Offset Register Name Description Access Reset Value