756
/
838
Nations Technologies Inc.
Tel
：
+86-755-86309900
：
Address: Nations Tower, #109 Baoshen Road, Hi-tech Park North.
Nanshan District, Shenzhen, 518057, P.R.China
Bit field
Name
Description
blocking signal at the sender to notify that there is a conflict.
The back pressure function is automatically disabled in full duplex mode.
25.5.9
ETH MAC VLAN tag register (ETH_MACVLANTAG)
Address offset: 0x001C
Reset value: 0x0000 0000
This register contains the IEEE802.1Q VLAN tag used to identify VLAN frames. MAC compares the 13th and 14th
bytes (length/type fields) of the received frame with 0x8100, and then compares the next 2 bytes (15th and 16th bytes)
with the VLAN tag.
Bit field
Name
Description
31:17
Reserved
Reserved, the reset value must be maintained.
16
ETC
12-bit VLAN tag comparison bits.
This bit selects VLAN tag to be compared with ETH_MACVLANTAG.VLTI[11:0]
(12 bits) or ETH_MACVLANTAG.VLTI[15:0] (16 bits).
0: Use all 16-bit data for comparison.
1: Use only 12-bit data for comparison.
15:0
VLTI[15:0]
VLAN tag identifier bits.
These bits are used to identify the 802.1Q VLAN tag format of VLAN frame. The
format is as follows:
VLTI[15:13]: UP (user priority)
VLTI[12]: CFI (Standard Format Indicator)
VLTI[11:0]: VID (VLAN identifier)
Define VLTI[n:0], when ETH_MACVLANTAG.ETC = 1, n = 11; when
ETH_MACVLANTAG.ETC = 0, n = 15.
If the value of VLTI[n:0] is all 0, MAC will no longer compare and check the 15th
and 16th bytes of VLAN frame, and will directly regard the frame with the type field
value of the received frame as 0x8100 as a VLAN frame.
If VLTI[n:0] is not all 0, use VLTI[n:0] for comparison.
25.5.10
ETH MAC remote wakeup frame filter register
(ETH_MACRMTWUFRMFLT)
Address offset: 0x0028
