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参数资料
| 型号： | STE10/100E |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 1 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP128 |
| 封装： | 14 X 20 MM, 2.70 MM HEIGHT, PLASTIC, QFP-128 |
| 文件页数： | 44/66页 |
| 文件大小： | 396K |
| 代理商： | STE10/100E |
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STE10/100A
6.5 Network Operation
6.5.1 MAC Operation
The MAC (Media Access Control) portion of STE10/100A incorporates the essential protocol requirements for
operating as an IEEE802.3 and Ethernet compliant node.
s
Format
*Note: If padding is disabled (TDES1 bit 23), the data field may be shorter than 46 bytes.
s
Transmit Data Encapsulation
The differences between transmit data encapsulation and a MAC frame while operating in 100BASE-
TX mode are listed as follows:
1. The first byte of the preamble is replaced by the JK code according to IEE802.3u, clause 24.
2. After the CRC field of the MAC frame, the STE10/100A will insert the TR code according to
IEE802.3u, clause 24.
s
Receive Data Decapsulation
When operating in 100BASE-TX mode the STE10/100A detects a JK code in a preamble as well as a
TR code at the packet end. If a JK code is not detected, the STE10/100A will abort the reception of the
frame and wait for a new JK code detection. If a TR code is not detected, the STE10/100A will report a
CRC error.
s
Deferring
The Inter-Frame Gap (IFG) time is divided into two parts:
1.IFG1 time (64-bit time): If a carrier is detected on the medium during this time, the STE10/100A will
reset the IFG1 time counter and restart to monitor the channel for an idle again.
2.IFG2 time (32-bit time): After counting the IFG2 time the STE10/100A will access the channel even
though a carrier has been sensed on the network.
s
Collision Handling
The scheduling of re-transmissions are determined by a controlled randomization process called
“truncated binary exponential back-off”. At the end of enforcing a collision (jamming), the STE10/100A
delays before attempting to re-transmit the packet. The delay is an integer multiple of slot time. The
number of slot times to delay before the nth re-transmission attempt is chosen as a uniformly distributed
integer r in the range:
0 r < 2k where k = min(n, 10)
Field
Description
Preamble
A 7-byte field of (10101010b)
Start Frame Diameter
A 1-byte field of (10101011b)
Destination Address
A 6-byte field
Source Address
A 6-byte field
Length/Type
A 2-byte field indicated the frame is in IEEE802.3 format or Ethernet format.
IEEE802.3 format: 0000H ~ 05DCH for Length field
Ethernet format: 05DD ~ FFFFH for Type field
Data
*46 ~ 1500 bytes of data information
CRC
A 32-bit cyclic redundancy code for error detection
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