LAN9221_12 Datasheet, PDF (65/151 Pages) SMSC Corporation – High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O

High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O
Datasheet
3.13.3
Host Read
Order
1st
2nd
31
0
Optional offset DWORD0
.
.
Optional offset DWORDn
ofs + First Data DWORD
.
.
.
.
Last Data DWORD
RX
Checksum
Optional Pad DWORD0
.
.
Last
Optional Pad DWORDn
Figure 3.27 RX Packet Format with RX Checksum
RX Status Format
BITS
31
30
29:16
15
14
13
12
11
10
9:8
DESCRIPTION
Reserved. This bit is reserved. Reads 0.
Filtering Fail. When set, this bit indicates that the associated frame failed the address recognizing
filtering.
Packet Length. The size, in bytes, of the corresponding received frame.
Error Status (ES). When set this bit indicates that the MIL has reported an error. This bit is the
Internal logical “or” of bits 11,7,6 and 1.
Reserved. These bits are reserved. Reads 0.
Broadcast Frame. When set, this bit indicates that the received frame has a Broadcast address.
Length Error (LE). When set, this bit indicates that the actual length does not match with the
length/type field of the received frame.
Runt Frame. When set, this bit indicates that frame was prematurely terminated before the collision
window (64 bytes). Runt frames are passed on to the host only if the Pass Bad Frames bit MAC_CR
Bit [16] is set.
Multicast Frame. When set, this bit indicates that the received frame has a Multicast address.
Reserved. These bits are reserved. Reads 0.
SMSC LAN9221/LAN9221i
65
DATASHEET
Revision 2.9 (03-01-12)