CHAPTER 21:Ethernet MAC
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G
583
Bit
s
Function
23:22
This bit has a different meaning depending on whether RX checksum offloading is enabled.
With RX checksum offloading disabled:
Type ID register match. Encoded as follows:
00 - Type ID Match 1 register
01 - Type ID Match 2 register
10 - Type ID Match 3 register
11 - Type ID Match 4 register
If more than one Type ID is matched only one of them is indicated with priority 4 down to 1.
With RX checksum offloading enabled:
00 - Neither the IP header checksum nor the TCP/UDP checksum was checked.
01 - The IP header checksum was checked and was correct. Neither the TCP nor UCP
checksum
was checked.
10 - Both the IP header and TCP checksum were checked and were correct.
11 - Both the IP header and UDP checksum were checked and were correct.
21
VLAN tag detected - Type ID of 8100
h
. For packets incorporating the stacked VLAN processing
feature, this bit will be set if the second VLAN tag has a Type ID of 8100
h
.
20
Priority tag detected - Type ID of 8100
h
and null VLAN identifier. For packets incorporating the
stacked VLAN processing feature, this bit will be set if the second VLAN tag has a Type ID of
8100
h
and a null VLAN identifier.
19:17
VLAN priority - only valid if bit 21 is set.
000 - Priority 0 (lowest)
BK Background
001 - Priority 1
BE Best Effort
010 - Priority 2
EE Excellent Effort
011 - Priority 3
CA Critical Applications
100 - Priority 4
VI
Video, <100ms latency and jitter
101 - Priority 5
VO Voice, <10ms latency and jitter
110 - Priority 6
IC
Internetwork Control
111 - Priority 7 (highest)
NC Network Control
16
Canonical Format Indicator (CFI) bit - only valid if bit 21 is set.
15
End of Frame - when set the buffer contains the end of a frame. If End of Frame is not set, then
the only valid status bit is Start of Frame (bit 14).
14
Start of Frame - when set the buffer contains the start of a frame. If both bits 15 and 14 are set,
the buffer contains a whole frame.
13
This bit has a different meaning depending on whether jumbo frames and ignore FCS mode are
enabled (ETHERNETn_network_configuration[3], ETHERNETn_network_configuration[26]). If
neither mode is enabled this bit will be "0".
With jumbo frame mode enabled:
Additional bit for length of frame (bit 13), that is concatenated with bits [12:0]
With ignore FCS mode enabled and jumbo frames disabled:
This indicates per frame FCS status as follows:
0 - Frame had good FCS
1 - Frame had bad FCS, but was copied to memory as ignore FCS is enabled.
Содержание S6J3200 Series
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