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参数资料
| 型号： | 91C94 |
| 厂商： | SMSC Corporation |
| 英文描述： | ISA/PCMCIA SINGLE CHIP ETHERNET CONTROLLER WITH RAM |
| 中文描述： | 的ISA / PCMCIA的单芯片以太网控制器与RAM |
| 文件页数： | 85/120页 |
| 文件大小： | 447K |
| 代理商： | 91C94 |
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67
TYPICAL FLOW OF EVENTS FOR TRANSMIT
S/W DRIVER
CSMA/CD SIDE
1
ISSUE ALLOCATE MEMORY FOR TX - N
BYTES
- the MMU attempts to allocate N
bytes of RAM.
2
WAIT
FOR
SUCCESSFUL
COMPLETION
CODE - Poll until the ALLOC INT bit is set or
enable its mask bit and wait for the interrupt.
The TX packet number is now at the Allocation
Result Register.
3
LOAD TRANSMIT DATA - Copy the TX packet
number into the Packet Number Register.
Write the Pointer Register, then use a block
move operation from the upper layer transmit
queue into the Data Register.
4
ISSUE "ENQUEUE PACKET NUMBER TO TX
FIFO" - This command writes the number
present in the Packet Number Register into the
TX FIFO. The transmission is now enqueued.
No further CPU intervention is needed until a
transmit interrupt is generated.
5
The enqueued packet will be transferred to the
CSMA/CD block as a function of TXENA (in
TCR) bit and of the deferral process state.
6
Upon transmit completion the first word in
memory is written with the status word. The
packet number is moved from the TX FIFO
into the TX completion FIFO.
Interrupt is
generated by the TX completion FIFO being
not empty.
7
SERVICE INTERRUPT - Read Interrupt Status
Register. If it is a transmit interrupt, read the
TX Done Packet Number from the Fifo Ports
Register. Write the packet number into the
Packet Number Register.
The corresponding
status word is now readable from memory. If
status word shows successful transmission,
issue RELEASE packet number command to
free up the memory used by this packet.
Remove packet number from completion FIFO
by writing TX INT Acknowledge Register.
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| 91CCC3 | 制造商:Wirepro 功能描述:Connector Accessories Cap and Chain For Receptacle |
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| 91CR100 | 功能描述:微调电阻 - 通孔 3/8inch 100 Thumbwheel RoHS:否 制造商:Vishay/Sfernice 产品:Trimmer Resistors - Multi Turn 产品类型:Multiturn 转数:14 锥度:Linear 电阻:10 kOhms 电压额定值:250 V 端接类型:Pin 功率额定值:250 mW (1/4 W) 容差:10 % 温度系数:100 PPM / C |
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