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| 型號(hào)： | E-1110 |
| 英文描述： | E-1110 10/100/1000 Mbits/s Ethernet MAC preliminary technical manual 4/01 |
| 中文描述： | 電子1110 10/100/1000 Mbits /秒以太網(wǎng)MAC初步的技術(shù)手冊4 / 01 |
| 文件頁數(shù)： | 79/108頁 |
| 文件大小： | 577K |
| 代理商： | E-1110 |
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3-34
Signals
E110_RSVP_L
E-110 Receive Status Vector PulseInput
The E110_RSVP_L signal is active-LOW. When the MAC
asserts E110_RSVP_L, it indicates that the
E110_RSV[27:0] signals have been updated with a new
receive statistics vector. When deasserted, it indicates
that there has been no update. The RSVP_L signal is
also connected to the optional MAC control module core.
E110_RSV[27:0]
E-110 Receive Status Vector
Input
The E110_RSV[27:0] signals contain the receive
statistics vector and are updated on the falling edge of
E110_RSVP_L. The statistics vector is issued at the end
of any minimally qualied receive event. A minimally
qualied receive event occurs when the MAC receives at
least one nibble of data beyond a valid preamble and
SFD.
The E110_RSV[27:0] signals are stable until the
subsequent E110_RSVP_L pulse. The condition
associated with each signal is valid when the signal is
HIGH.
The receive statistics provided by the MAC function can
be used for RMON and SNMP. However, the MAC does
not collect the statistics specically mentioned in the
RMON and SNMP specications. The MAC provides
basic per packet information that can be collected by an
application built on top of the MAC. The collected
information can then be used for RMON and SNMP.
The signals in E110_RSV[27:0] have the following
functions:
RSV27
Oversize packet received. This signal is asserted
when the MAC receives a packet larger than
1518 bytes, or 1522 bytes when the host
VLAN_EN signal is asserted in normal mode.
When HUGE_PKT_EN is asserted, RSV27 is
asserted if the packet received is larger than
MAX_PKT_LEN[15:0].
RSV26
Receive false carrier sense status. When the
MII_RXDV signal is deasserted, the MII_RXER
signal is asserted, and MII_RXD[3:0] is 0b1110,
this bit is set and reported with the next received
packets.
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