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參數(shù)資料
| 型號： | SPAK302PV16VC |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP144 |
| 封裝： | 20 X 20 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, PLASITC, LQFP-144 |
| 文件頁數(shù)： | 88/128頁 |
| 文件大?。?/td> | 641K |
| 代理商： | SPAK302PV16VC |
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ETHERNET Controller
MOTOROLA
MC68EN302 REFERENCE MANUAL
4-23
Broadcast and multicast frames may be either unconditionally accepted or unconditionally
rejected. Note that multicast frames may be conditionally accepted based on a matching
table entry, either perfect or hash. Refer to Figure 4-4 and Table 4-3 for broadcast and
multicast frame address recognition.
Physical addresses are compared to perfect-match entries and either accepted or rejected.
If no perfect match occurs, the addresses may then be accepted (but not rejected) on the
basis of a hash match. Refer to Figure 4-4 and Table 4-4 for physical address recognition.
A physical address, but not a multicast address, may be rejected on the basis of a perfect
match. A hash table match alone on a physical address is not sufficient to reject that frame.
The address recognition memory is not initialized at reset; the user must initialize it before
setting ETHER_EN in ECNTRL. Perfect-match entries which are unused should be set to
all 1’s (broadcast address) which is a safe value since broadcast frame handling occurs
independently of any table entries. Unused hashmode entry bits must be set to 0.
4.6.1 BUFFER DESCRIPTOR MODIFICATION
Index values and reason fields may be passed into the upper byte of the receive buffer
descriptor’s data pointer by setting the INDEX_EN bit. This may help improve software
efficiency. If INDEX_EN is cleared, the receive buffer descriptor data pointer is not modified
by the MC68EN302. If INDEX_EN is set, the index value and reason field will be written into
all the BDs of a frame.
There are four reasons, not counting promiscuous mode, which cause a frame to be
accepted:
1. The frame is a multicast or broadcast frame and the appropriate MULT bits are set.
2. A perfect address match occurs.
3. A hash match occurs.
4. No perfect match occurs, the frame has a physical, not multicast address, and the
PA_REJ bit is set.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SPAK56854FG120 | 制造商:Freescale Semiconductor 功能描述: |
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| SPAK56F803BU80 | 制造商:Freescale Semiconductor 功能描述: |
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| SPAKDSP303AG100 | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC SPAKDSP303AG100 RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
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