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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)： | 81/128頁 |
| 文件大?。?/td> | 641K |
| 代理商： | SPAK302PV16VC |
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ETHERNET Controller
MOTOROLA
MC68EN302 REFERENCE MANUAL
4-17
W—Wrap (Final BD in Table), written by user.
0 = This is not the last buffer descriptor in the Tx BD table.
1 = This is the last buffer descriptor in the Tx BD table. After this buffer has been used,
the Ethernet controller transmits data from the first BD in the table. The maximum
number of Tx BDs in this table is programmable through the BDSIZE bits.
I—Interrupt, written by user.
0 = No interrupt is generated after this buffer has been serviced.
1 = TBINT is set in the Ethernet event register after this buffer has been serviced. If
enabled through the mask register, this bit can cause interrupts to the host.
L—Last in Frame, written by user.
0 = The buffer is not the last in the transmit frame.
1 = The buffer is the last in the transmit frame.
TC—Tx CRC, written by user (only valid if L = 1).
0 = End transmission immediately after the last data byte.
1 = Transmit the CRC sequence after the last data byte.
DEF—Defer Indication, written by Ethernet controller (only valid if L = 1).
The Ethernet controller had to defer while attempting frame transmission. DEF is not set if
a collision occurs during transmission.
HB—Heartbeat Error, written by Ethernet controller (only valid if L = 1).
The collision input was not asserted within the heartbeat window after transmit completion.
HB may be set only if HBC is not set in the ECNFIG register.
LC—Late Collision, written by Ethernet controller (only valid if L = 1).
A collision has occurred after 56 data bytes have been transmitted. The Ethernet controller
terminates the transmission.
RL—Retransmission Limit, written by Ethernet controller (only valid if L = 1).
The transmitter has failed (Retry Limit + 1) attempts to successfully transmit a message due
to repeated collisions on the medium.
RC—Retry Count, written by Ethernet controller (only valid if L = 1).
These four bits indicate the number of retries required before this frame was successfully
transmitted. If RC = 0, then the frame was transmitted correctly the first time. If RC = 15,
then the frame was transmitted successfully while the retry count was at its maximum value.
If RL is set, then RC has no meaning.
UN—Underrun, written by Ethernet controller (only valid if L = 1).
A transmit FIFO underrun occurred while transmitting one or more of the the data buffers
associated with this frame. When FIFO underrun occurs, frame transmission halts once an
incorrect CRC is appended. The remaining buffer(s) associated with this frame are DMA’d
and dumped by the transmit logic.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| SPAK56854FG120 | 制造商:Freescale Semiconductor 功能描述: |
| SPAK56857BU120 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:120 MIPS Hybrid Processor |
| 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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