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參數(shù)資料
| 型號： | 21041 |
| 廠商： | Intel Corp. |
| 英文描述： | Digital Semiconductor 21041 PCI Ethernet LAN Controller(數(shù)字半導(dǎo)體21041 PCI以太網(wǎng)LAN控制器) |
| 中文描述： | 數(shù)字半導(dǎo)體21041 PCI以太網(wǎng)局域網(wǎng)控制器（數(shù)字半導(dǎo)體21041的PCI以太網(wǎng)局域網(wǎng)控制器） |
| 文件頁數(shù)： | 10/64頁 |
| 文件大小： | 230K |
| 代理商： | 21041 |
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1.2 Microarchitecture
The following list describes the 21041 microarchitecture components, and
Figure 1 shows the microarchitecture.
PCI interface—Includes all interface functions to the PCI bus; handles all
interconnect control signals; executes PCI direct memory access (DMA) and
I/O transactions.
DMA—Contains dual receive and transmit controller; supports
programmable burst sizes of up to 32 longwords; handles data transfers
between system memory and onchip memory.
FIFOs—Contains dual 256-byte FIFOs for receive and transmit; supports
automatic receive packet deletion (for example, runt packets or after a
collision) and packet retransmission after a collision on transmit.
TxM—Handles all CSMA/CD
1
MAC
2
-level transmit operations and
transfers data from transmit FIFO to the serial interface attachment (SIA)
for transmission.
RxM—Handles all CSMA/CD receive operations and transfers the data
from the SIA to the receive FIFO.
SIA—Performs physical layer operations; implements the AUI and
10BASE-T functions, including the Manchester encoder and decoder
functions.
Boot ROM—Includes the required interface to the boot ROM for read and
write operations. Accesses to bytes or to longwords (32-bit) are supported.
SROM—Provides all interface logic to allow accesses to the external serial
ROM.
LEDs—Contains the logic to detect seven network events and to drive them
outside the device for LED display. Also supports two general-purpose
LEDs.
1
Carrier-sense multiple access with collision detection
Media access control
2
2
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