參數(shù)資料
型號(hào)： CP2200-GQ
廠商： Silicon Laboratories Inc
文件頁(yè)數(shù)： 64/108頁(yè)
文件大?。?/td> 0K
描述： IC ETH CTRLR SNGL-CHIP 48TQFP
標(biāo)準(zhǔn)包裝： 250
控制器類型： 以太網(wǎng)控制器，MAC/10Base-T
接口： 并行/串行
電源電壓： 3.1 V ~ 3.6 V
電流 - 電源： 75mA
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 48-TQFP
供應(yīng)商設(shè)備封裝： 48-TQFP（7x7）
包裝： 托盤
產(chǎn)品目錄頁(yè)面： 627 (CN2011-ZH PDF)
配用： 336-1316-ND - KIT EVAL FOR CP2201 ETH CTRLR
其它名稱： 336-1312
CP2200/1
Rev. 1.0
59
Note: The value of CPADDRH:CPADDRL may be invalid if an overflow event occurs. After an overflow, the FIFOHEADH:FIFO-
HEADL pointer should be used to determine the starting address of the current packet. CPLEN will always remain valid
even after an overflow event.
Note: If the Receive FIFO Full Interrupt is triggered, the interrupt flag must be cleared to re-enable packet reception. The
Receive FIFO Full Interrupt is triggered based on the size of packets or on the number of packets. If triggered based on
the number of packets, then pointer corruption has occurred.
12.4. Initializing the Receive Buffer, Filter and Hash Table
After a device reset, the receive buffer is empty and the filter is configured to accept broadcast packets and
multicast packets matching a hash value of 0x0400. This hash value allows PAUSE control packets to pass
through the receive filter.
The receive buffer does not require any additional initialization. The receive filter can be configured to accept or
ignore broadcast packets, multicast packets, runt packets (Ethernet Frame smaller than 64 bytes), and packets
with a CRC error. The receive filter is configured using the RXFILT register.
The device can be configured to accept broadcast packets and packets addressed to the controller’s MAC address
without using the hash table. If multicast packets need to be accepted, then the hash table can be programmed to
accept packets addressed to specific address ranges.
The CP2200/1 implements a 16-bit hash table to represent all possible addresses in the 64-bit address space.
Each of the possible 65536 possible values for the hash table represent a range of MAC addresses. If all 16 bits
are set to ‘1’, all multicast addresses will be accepted. If all 16-bits are set to ‘0’, then all multicast addresses will be
rejected.The following procedure can be used to determine which bits to set for a specific address:
Step 1: Perform a 32-bit CRC on the 6-bytes of the address using 0xC704DD7B as the polynomial.
Step 2: Record the least significant 4 bits of the CRC result (Hash Index).
Step 3: The Hash Index determines the bit that should be set in the hash table that will allow the address to
be received. For example, if the least significant 4-bits of the CRC result are 101b (5d), then setting
bit 5 of the 16-bit hash table will allow all MAC addresses whose CRC result is 5d to be accepted.
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CP2201 制造商:SILABS 制造商全稱:SILABS 功能描述:SINGLE-CHIP ETHERNET CONTROLLER
CP2201EK 功能描述:以太網(wǎng)開發(fā)工具 ETHERNET EVAL KIT RoHS:否 制造商:Micrel 產(chǎn)品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評(píng)估:KSZ8873RLL 接口類型:RMII 工作電源電壓:
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