參數(shù)資料
型號(hào)： E-110
廠商： LSI Corporation
英文描述： 100BASE-T Fast Ethernet Core(100BASE-T快速以太網(wǎng)處理芯片 Fast Ethernet Core)
中文描述： 100兆- T的快速以太網(wǎng)核心（100兆- T的快速以太網(wǎng)處理芯片快速以太網(wǎng)核心）
文件頁數(shù)： 79/130頁
文件大?。?/td> 770K
代理商： E-110
E-110 Core Operation
3-7
IPGR1[6:0] is the threshold value used to reset the MAC’s IPG counter
if CRS is detected within a short time after receiving a packet (see
Figure 3.5). If CRS is asserted before the IPG counter value reaches the
IPGR1[6:0] threshold, the MAC resets the IPG counter because the CRS
may have occurred due to a collision fragment (see Figure 3.5). If the
IPG counter makes it past the IPGR1[6:0]
1
threshold, the MAC does not
reset the IPG counter so that the E-110 MAC is able to access to the
medium without being constantly deferred by other stations trying to gain
access.
IPGR2[6:0]
2
is the threshold value for measuring the IPG if the MAC has
been receiving and the host wants the MAC to transmit. That is, when
the IPG counter has exceeded the value in IPGR1[6:0] and reaches the
value in IPGR2[6:0], the MAC can transmit.
Because IPGR1[6:0] and IPGR2[6:0] are programmable, IPGR1[6:0] may
be set to a threshold that is a fraction of IPGR2[6:0] to conform to the
IPG rules of the IEEE 802.3/802.3u specifications.
3
Figure 3.4 and
Figure 3.5 illustrate half-duplex IPG operation.
Figure 3.4
Half-Duplex Back-to-Back IPG Operation
1. A value of 18 (decimal) for IPGT[6:0] results in an IPG of 960 ns for 100-Mbit/s operation
(the value given in IEEE 802.3u, section 1.4.102) at the MII. When IPGT[6:0] is set to 18,
the IPG counter counts from 0 to 18 (19 clocks total) using the nibble clock. The nibble clock
runs at 25 MHz (40 ns) for 100-Mbit/s operation and 2.5 MHz (400 ns) for 10-Mbit/s opera-
tion). The 19 clocks plus a 5-clock internal core delay results in 24 clocks, which yields 960
ns for 100-Mbit/s operation or 9.6
μ
s for 10-Mbit/s operation. Depending on PHY propagation
delays, the value for IPGT[6:0] may need to be adjusted to meet the IPG requirement at the
network interface.
1. The nominal value for IPGR1[6:0] is 11 (decimal).
2. A nominal value for IPGR2[6:0] is 18 (decimal). The PHY may have its own propagation de-
lay and the value of 18 (decimal) may or may not be the correct value for a particular PHY.
3. See IEEE 802.3 Sections 4.2.3.2.1 and 4.2.3.2.2. See also IEEE 802.3u Section1.4.102.
CRS
IPG Counter0
18 (IPGT[6:0])
Transmit
Frame
IPG
IPG
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