LAN91C100FD datasheet(39/77 Pages) SMSC

39 / 77 page

FEAST Fast Ethernet Controller with Full Duplex Capability

SMSC LAN91C100FD Rev. D

Page 39

Revision 1.0 (09-22-08)

DATASHEET

FLTST - Facilitates the inclusion of packet forwarding information on the receive packet memory structure.

When 0, RD0-RD7 is always driven. When 1, RD0-RD7 is floated during RECEIVE FRAME STATUS

WORD writes (RA2-RA16=0, RCVDMA=1, nRWE0-nRWE3=0).

MSK_CRS100 - Disables CRS100 detection during transmit in half duplex mode (SWFDUP=0).

MDO - MII Management output. The value of this bit drives the MDO pin.

MDI - MII Management input. The value of the MDI pin is readable using this bit.

MDCLK - MII Management clock. The value of this bit drives the MDCLK pin.

MDOE - MII Management output enable. When high pin MDO is driven, when low pin MDO is tri-stated.

The purpose of this interface, along with the corresponding pins is to implement MII PHY management in

software.

BANK 3

OFFSET

NAME

TYPE

SYMBOL

REVISION REGISTER

READ ONLY

REV

HIGH

BYTE

LOW

BYTE

CHIP

REV

CHIP - Chip ID. Can be used by software drivers to identify the device used.

REV - Revision ID. Incremented for each revision of a given device.

OFFSET

NAME

TYPE

SYMBOL

RCV REGISTER

READ/WRITE

RCV

HIGH

BYTE

nRXDISC PIN COUNTER

LOW

BYTE

RCV

DISCR

MBO

nRXDISC PIN COUNTER - 8-bit counter increments when a packet is discarded due to the nRXDISC pin

being active. This counter will be reset to 00 when read. A count of FF will set the RX_DISC INT. The

count will wrap around to 00 after FF.

RCV DISCRD - Set to discard a packet being received. Will discard packets only in the process of being

received. When set prior to the end of receive packet, bit 4 (RXOVRN) of the interrupt status register will

be set to indicate that the packet was discarded. Otherwise, the packet will be received normally and bit 0

set (RCVINT) in the interrupt status register. RCV DISCRD is self clearing.

MBO – Must be 1.

LAN91C100FD Datasheet(PDF) 39 Page - SMSC Corporation

LAN91C100FD Datasheet(HTML) 39 Page - SMSC Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77

Datasheet Download

Link URL