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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(yè)數(shù)： | 99/130頁(yè) |
| 文件大小： | 770K |
| 代理商： | E-110 |
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MAC Functional Timing
4-3
4.1.1.1 Preamble
Every packet is preceded by a preamble consisting of seven octets
followed by a single SFD octet. The preamble and SFD are shown in
Figure 4.2.
Figure 4.2
Packet Preamble and SFD
In Figure 4.2, the preamble and SFD are shown in the serial bit order of
reception. For each octet, the leftmost bit in each octet value represents
the least significant bit of the octet and the rightmost bit represents the
most significant bit of the octet. The preamble consists, then, of seven
octets of 0x55. The SFD octet (0xD5) indicates the start of frame and
follows the preamble. In Figure 4.1, the MRXD[3:0] data changes in the
beginning from 0x0 to 0x5 to 0xD, which represents the transition from
idle to preamble to SFD.
4.1.1.2 Nibble and Byte Assembly
Data is passed to the E-110 MAC from the PHY as nibbles on the
MRXD[3:0] lines. Because the data is received least significant bit first,
the low nibble is received, then the high nibble. Figure 4.1 shows that the
PHY transfers the MRXD[3:0] nibbles received after the SFD to the
E-110 MAC in the following order: 0x3, 0x4, 0x4, 0x0, 0x0, 0x0, 0x1, 0x0,
0x0, 0x2, 0x0, 0x0, 0x3, 0x0, 0x0, 0x4, and so on. The MAC then
assembles the nibbles into bytes with the nibbles in reverse position, so
that the high and low nibbles are in the proper order for the host on the
RPD[7:0] signals. The RPD[7:0] data in Figure 4.1 shows that the MAC
sends the bytes to the host in the following order: 0x43, 0x04, 0x00,
0x01, 0x20, 0x03, 0x40, and so on.
A packet transmission to the receive control logic from the receive
function begins when the receive function asserts the RPSF and RPDV
signals along with the first byte of received packet data after removing
the preamble and SFD. For subsequent data bytes, the receive function
asserts only the RPDV signal until the last byte, when it asserts both the
RPDV and RPEF signals.
SFD
Preamble
101010m
l
l
l
l
l
l
m
m
m
m
m
m
m
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