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參數(shù)資料
| 型號(hào)： | DS3184DK |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 94/400頁(yè) |
| 文件大小： | 0K |
| 描述： | KIT DEMO FOR DS3184 |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 電信，ATM / 數(shù)據(jù)包 PHY |
| 已用 IC / 零件： | DS3184 |
| 已供物品： | 板，CD |
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DS3181/DS3182/DS3183/DS3184
183
FIFO contains less than two bytes or transmit packet start is disabled. Transmit packet start is programmable (on
or off). When the Transmit Packet Processor reads the Transmit FIFO while it is empty, the output data stream is
marked with an abort indication. Once the Transmit FIFO is empty, the output data stream will be padded with
interframe fill until the Transmit FIFO contains two or more bytes of data and transmit packet start is enabled.
Bit reordering changes the bit order of each byte. If bit reordering is disabled, the outgoing 8-bit data stream
DT[1:8] with DT[1] being the MSB and DT[8] being the LSB is input from the Transmit FIFO with the MSB in TFD[0]
and the LSB in TFD[7] of the transmit FIFO data TFD[7:0]. If bit reordering is enabled, the outgoing 8-bit data
stream DT[1:8] is input from the Transmit FIFO with the MSB in TFD[7] and the LSB in TFD[0] of the transmit FIFO
data TFD[7:0]. DT[1] is the first bit transmitted on the outgoing data stream.
FCS processing calculates a FCS and appends it to the packet. FCS calculation is a CRC-16 calculation over the
entire packet. The polynomial used for the CRC-16 is x
16 + x12 + x5 + 1. The CRC-16 is inverted after calculation,
and appended to the packet. For diagnostic purposes, a FCS error can be inserted. This is accomplished by
appending the calculated CRC-16 without inverting it. FCS error insertion is programmable (on or off). When FCS
processing is disabled, the packet is output without appending a FCS. FCS processing is programmable (on or off).
Stuffing inserts control data into the packet to prevent packet data from mimicking flags. Stuffing is halted during
FIFO empty periods. The 8-bit parallel data stream is multiplexed into a serial data stream, and bit stuffing is
performed. Bit stuffing consists of inserting a '0' directly following any five contiguous '1's. Stuffing is performed
from a packet start until a packet end.
Inter-frame padding inserts inter-frame fill between the packet start and end flags when the FIFO is empty. The
inter-frame fill can be flags or '1's. If the inter-frame fill is flags, flags (minimum two) are inserted until a packet start
is received. If the inter-frame fill is all '1's, an end flag is inserted, ‘1’s are inserted until a packet start is received,
and a start flag is inserted after the ‘1’s. The number of '1's between the end flag and start flag may not be an
integer number of bytes, however, the inter-frame fill will be at least 15 consecutive '1's. If the FIFO is not empty
between a packet end and a packet start, then two flags are inserted between the packet end and packet start. The
inter-frame padding type is programmable (flags or ‘1’s).
Packet abort insertion inserts a packet abort sequences as necessary. If a packet abort indication is detected, a
packet abort sequence is inserted and inter-frame padding is done until a packet start is detected. The abort
sequence is FFh.
Once all packet processing has been completed, the datastream is inserted into the DS3/E3 datastream at the
proper locations. If transmit data inversion is enabled, the outgoing data is inverted after packet processing is
performed. Transmit data inversion is programmable (on or off).
10.11.5 Receive HDLC Overhead Processor
The Receive HDLC Overhead Packet Processor accepts data from the DS3/E3 Framer or the PLCP Framer and
performs packet delineation, inter-frame fill filtering, packet abort detection, destuffing, FCS processing, and bit
reordering. If receive data inversion is enabled, the incoming data is inverted before packet processing is
performed. Receive data inversion is programmable (on or off).
Packet delineation determines the packet boundary by identifying a packet start flag. Each time slot is checked for
a flag sequence (7Eh). Once a flag is found, if it is identified as a start or end flag, and the packet boundary is set.
There may be a single flag (both end and start) between packets, there may be an end flag and a start flag with a
shared zero (011111101111110) between packets, there may be an end flag and a start flag (two flags) between
packets, or there may be an end flag, inter-frame fill, and a start flag between packets. The flag check is performed
one bit at a time.
Inter-frame fill filtering removes the inter-frame fill between a start flag and an end flag. All inter-frame fill is
discarded. The inter-frame fill can be flags (01111110) or all '1's. When inter-frame fill is all ‘1’s, the number of '1's
between the end flag and the start flag may not be an integer number of bytes. When inter-frame fill is flags, the
number of bits between the end flag and the start flag will be an integer number of bytes (flags). Any time there is
less than 16 bits between two flags, the data will be discarded.
Packet abort detection searches for a packet abort sequence. Between a packet start flag and a packet end flag, if
an abort sequence is detected, the packet is marked with an abort indication, and all subsequent data is discarded
until a packet start flag is detected. The abort sequence is seven consecutive ones.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS3184N | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Quad ATM/Packet PHYs w/Built-In LIU RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS3184N+ | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Quad ATM/Packet PHYs w/Built-In LIU RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS318PIN | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Industrial Control IC |
| DS-318PIN | 制造商:MA-COM 制造商全稱(chēng):M/A-COM Technology Solutions, Inc. 功能描述:Plug-In Two-Way Power Divider, 5 - 500 MHz |
| DS-318-PIN | 功能描述:信號(hào)調(diào)節(jié) RoHS:否 制造商:EPCOS 產(chǎn)品:Duplexers 頻率:782 MHz, 751 MHz 頻率范圍: 電壓額定值: 帶寬: 阻抗:50 Ohms 端接類(lèi)型:SMD/SMT 封裝 / 箱體:2.5 mm x 2 mm 工作溫度范圍:- 30 C to + 85 C 封裝:Reel |
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