Product specifications

VT8235 V-Link South Bridge
Revision 1.22 October 24, 2002 -121- Device 18 Function 0 LAN Registers
Offset 08 – Command 0 (00h)...........................................RW
7 Reserved ........................................ always reads 0
6 Receive Poll Demand ............................... default = 0
If this bit is set to 1, the Receive Descriptor (RD) will
be polled once (this bit will be cleared by hardware
after the polling is complete)
5 Transmit Poll Demand............................. default = 0
If this bit is set to 1, the Transmit Descriptor (TD)
will be polled once (this bit will be cleared by
hardware after the polling is complete)
4 Transmit Process
0 Transmit engine disabled....................... default
1 Transmit engine enabled (transmit may occur)
3 Receive Process
0 Receive disabled.................................... default
1 Receive enabled
2 Stop NIC
0 NIC enabled .......................................... default
1 NIC disabled (transmit/receive cannot occur)
1 Start NIC
0 No command entered ............................ default
1 Start the NIC
0 Begin Initialization Process..................... default = 0
If this bit is set to 1, the Receive Descriptor (RD) will
be polled once (this bit functions like bit-6 but for
legacy systems)
Offset 09 – Command 1 (00h).......................................... RW
7 Software Reset
0 No reset..................................................default
1 Reset the MAC
6 Receive Poll Demand 1.............................default = 0
This bit functions the same as Rx8[6]. The function
can be enabled by setting either bit (for backward
compatibility).
5 Transmit Poll Demand 1..........................default = 0
This bit functions the same as Rx8[5]. The function
can be enabled by setting either bit (for backward
compatibility).
4 Reserved ........................................always reads 0
3 TD / RD Auto Polling
0 Enable (polling interval is determined by
Rx6F[2:0] ) ............................................ default
1 Disable
2 Full Duplex
0 Set MAC to half duplex mode............... default
1 Set MAC to full duplex mode
1 Reserved ........................................always reads 0
0 Early Receive Mode
0 Disable (interrupt is generated after a packet
has been completely received)............... default
1 Enable (interrupt is generated as soon as
packet reception has started)