LAN9312 datasheet(272/458 Pages) SMSC

272 / 458 page

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

Revision 1.2 (04-08-08)

272

SMSC LAN9312

DATASHEET

Pass Bad Frames (PASSBAD)

When set, all incoming frames that passed address filtering are received,

including runt frames, collided frames or truncated frames caused by buffer

underrun. Refer to Section 9.4, "Address Filtering," on page 114 for

additional information.

R/W

Hash Only Filtering mode (HO)

When set, the address check Function operates in the Imperfect address

filtering mode for both physical and multicast addresses. Refer to Section

9.4.2, "Hash Only Filtering," on page 115 for additional information.

R/W

RESERVED

Hash/Perfect Filtering Mode (HPFILT)

When cleared (0), the LAN9312 will implement a perfect address filter on

incoming frames according the address specified in the Host MAC address

registers (Host MAC Address High Register (HMAC_ADDRH) and Host

MAC Address Low Register (HMAC_ADDRL)).

When set (1), the address check function performs imperfect address

filtering of multicast incoming frames according to the hash table specified

in the multicast hash table register. If the Hash Only Filtering mode (HO) bit

15 is set, then the physical (IA) addresses are also imperfect filtered. If the

Hash Only Filtering mode (HO) bit is cleared, then the IA addresses are

perfect address filtered according to the MAC Address register Refer to

Section 9.4.3, "Hash Perfect Filtering," on page 115 for additional

information.

R/W

RESERVED

Disable Broadcast Frames (BCAST)

When set, disables the reception of broadcast frames. When cleared,

forwards all broadcast frames to the application.

R/W

Disable Retry (DISRTY)

When set, the Host MAC attempts only one transmission. When a collision

is seen on the bus, the Host MAC ignores the current frame and goes to the

next frame and a retry error is reported in the Transmit status. When reset,

the Host MAC attempts 16 transmissions before signaling a retry error.

R/W

RESERVED

Automatic Pad Stripping (PADSTR)

When set, the Host MAC strips the pad field on all incoming frames, if the

length field is less than 46 bytes. The FCS field is also stripped, since it is

computed at the transmitting station based on the data and pad field

characters, and is invalid for a received frame that has had the pad

characters stripped. Receive frames with a 46-byte or greater length field

are passed to the application unmodified (FCS is not stripped). When

cleared, the Host MAC passes all incoming frames to the host unmodified.

R/W

BITS

DESCRIPTION

TYPE

DEFAULT

LAN9312 Datasheet(PDF) 272 Page - SMSC Corporation

LAN9312 Datasheet(HTML) 272 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 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL