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| 型号： | E-1110 |
| 英文描述： | E-1110 10/100/1000 Mbits/s Ethernet MAC preliminary technical manual 4/01 |
| 中文描述： | 电子1110 10/100/1000 Mbits /秒以太网MAC初步的技术手册4 / 01 |
| 文件页数： | 55/108页 |
| 文件大小： | 577K |
| 代理商： | E-1110 |
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3-12
Signals
The FLCTRL_CFG[1:0] signals can be derived from the
conguration port logic of the host interface. Care should
be taken to ensure that these inputs are stable during
normal operation and during packet transmissions.
FLOWCTRL_EN
Flow Control Enable
Input
FLOWCTRL_EN, when asserted, sends a pause frame
with the host-programmed pause time. When it is
deasserted, a pause frame with zero time is transmitted.
The ow control module also contains a mirror pause
time counter to send another pause frame if
FLOWCTRL_EN remains asserted and the pause timer
expires. This signal is internally synchronized for the
E-110. The Gigabit MAC synchronously samples the
signal on a continuous basis at 125 MHz.
PAUSE_TIME[15:0]
Pause Time
Input
PAUSE_TIME[15:0] species the pause time value used
while sending pause frames when FLOWCTRL_EN is
asserted.
PAUSE_TIME[15:0] can be derived from the conguration
port logic of the host interface. Care should be taken to
ensure that these inputs are stable during normal
operation and during packet transmissions.
MAC_ADDRESS[47:0]
MAC Address
Input
The MAC address value is used to match Unicast
addresses in the received packets. It is also used as a
source address in pause frames sent out by the transmit
function.
E110_FULL_DUPLEX
E-110 Full-Duplex Control
Input
This signal is used to select the half- or full-duplex mode
of operation for 10/100 mode. In Gigabit mode, this input
is a don’t care and the MAC is always congured for
full-duplex mode regardless of the status of this signal.
The E-110 MAC and the ow control module both
synchronously sample E110_FULL_DUPLEX during
MAC operations. This signal can be derived from the
conguration port logic of the host interface. Care should
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