LH79524/LH79525 User’s Guide Ethernet MAC Controller
Version 1.0 6-21
7 WRENSTAT
Write Enable for Statistics Registers Makes the statistics registers
writable for functional test purposes.
1 = Make statistics registers writable
0 = No action
6 INCRSTAT
Increment Statistics Registers Increment all the statistics registers by
one for test purposes.
1 = Increment statistics registers
0 = No action
5CLRSTAT
Clear Statistics Registers Clear the statistics registers. Individual sta-
tistics registers are cleared each time they are read.
1 = Clear statistics registers
0 = No action
4MANGEEN
Management Port Enable Enables the management port.
1 = Management Port enabled
0 = Force ETHERMDIO to high impedance state and ETHERMDC LOW.
3TXEN
Transmit Enable Enables the EMAC transmitter to send data. When
disabled, transmission stops immediately, the transmit FIFO and control
registers are cleared, and the TXBPQ register is reset to point to the start
of the Transmit Descriptor list.
1 = Enable Ethernet transmitter
0 = Disable Ethernet transmitter
2 RXEN
Receive Enable Enables the EMAC to receive data. When disabled,
frame reception stops immediately and the receive FIFO is cleared. The
RXBPQ register is unaffected.
1 = Enable EMAC receiver
0 = Disable EMAC receiver
1 LOOPLOCAL
Loop Back Local Connects ETHERTX to ETHERRX, ETHERTXEN to
ETHERRXDV, forces full duplex and drives ETHERRXCLK and
ETHERTXCLK with HCLK divided by 4. ETHERRXCLX and ETHERTX-
CLK may glitch as the EMAC is switched in and out of internal Loop Back.
It is important that receive and transmit circuits must already have been
disabled before making the switch into and out of internal Loop Back.
1 = Enable Loop Back
0 = Disable Loop Back
0///Reserved Reading returns 0. Write the reset value.
Table 6-7. NETCTL Fields (Cont’d)
BITS NAME FUNCTION
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