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LAN9117 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 49 Page - Microchip Technology

๋ถ€ํ’ˆ๋ช… LAN9117
์ƒ์„ธ๋‚ด์šฉ  High Performance Single-Chip 10/100 Non-PCI Ethernet Controller
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LAN9117 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 49 Page - Microchip Technology

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DS00002267A-page 49
LAN9117
Note 3-1
The LAN9117 host bus interface supports 16-bit bus transfers; internally, all data paths are 32-bits
wide. Figure 3-19 describes the host read ordering for pairs of atomic 16-bit transactions.
3.14.3
RX STATUS FORMAT
3.14.4
STOPPING AND STARTING THE RECEIVER
To stop the receiver, the host must clear the RXEN bit in the MAC Control Register. When the receiver is halted, the
RXSTOP_INT will be pulsed. Once stopped, the host can optionally clear the RX status and RX data FIFOs. The host
must re-enable the receiver by setting the RXEN bit.
Bits
Description
31
Reserved. This bit is reserved. Reads 0.
30
Filtering Fail. When set, this bit indicates that the associated frame failed the address recognizing
filtering.
29:16
Packet Length. The size, in bytes, of the corresponding received frame.
15
Error Status (ES). When set this bit indicates that the MIL has reported an error. This bit is the Internal
logical โ€œorโ€ of bits 11,7,6 and 1.
14
Reserved. These bits are reserved. Reads 0.
13
Broadcast Frame. When set, this bit indicates that the received frame has a Broadcast address.
12
Length Error (LE). When set, this bit indicates that the actual length does not match with the
length/type field of the received frame.
11
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.
10
Multicast Frame. When set, this bit indicates that the received frame has a Multicast address.
9:8
Reserved. These bits are reserved. Reads 0.
7
Frame Too Long. When set, this bit indicates that the frame length exceeds the maximum Ethernet
specification of 1518 bytes. This is only a frame too long indication and will not cause the frame
reception to be truncated.
6
Collision Seen. When set, this bit indicates that the frame has seen a collision after the collision
window. This indicates that a late collision has occurred.
5
Frame Type. When set, this bit indicates that the frame is an Ethernet-type frame (Length/Type field
in the frame is greater than 1500). When reset, it indicates the incoming frame was an 802.3 type
frame. This bit is not set for Runt frames less than 14 bytes.
4
Receive Watchdog time-out. When set, this bit indicates that the incoming frame is greater than 2048
bytes through 2560 bytes, therefore expiring the Receive Watchdog Timer.
3
MII Error. When set, this bit indicates that a receive error (RX_ER asserted) was detected during
frame reception.
2
Dribbling Bit. When set, this bit indicates that the frame contained a non-integer multiple of 8 bits.
This error is reported only if the number of dribbling bits in the last byte is 4 in the MII operating mode,
or at least 3 in the 10 Mbps operating mode. This bit will not be set when the collision seen bit[6] is
set. If set and the CRC error bit is [1] reset, then the packet is considered to be valid.
1
CRC Error. When set, this bit indicates that a CRC error was detected. This bit is also set when the
RX_ER pin is asserted during the reception of a frame even though the CRC may be correct. This bit
is not valid if the received frame is a Runt frame, or a late collision was detected or when the Watchdog
Time-out occurs.
0
Reserved. These bits are reserved. Reads 0


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