 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
NWK933 Datasheet(PDF) 3 Page - Mitel Networks Corporation |
|
||||||||||||||||||||||||||||||
NWK933 Datasheet(HTML) 3 Page - Mitel Networks Corporation |
|
|
3 / 18 page  3 NWK933 The Manchester data stream will be decoded into a 4- bit parallel data bus, RXD[3:0]. The RXD bus is clocked out on RX_CLK rising. The NWK933 must detect the first 4 bits of pre-amble before RX_DV is set high. When RX_DV is high, any Manchester coding violation will set RX_ER high. RX_DV is reset by a continuous sequence of zeroes, or by the end-of-packet IDLE terminator (11 11 00 00). Whilst RX_DV is low, the data is invalid. 100MHz Synthesizer This synthesizer employs a delay-locked loop (DLL) to generate a 100MHz timing reference from the 25MHz reference clock. This 100MHz reference is used by the 10BASE-T transmit and receive functions and is divided by 5 to provide a 20MHz data strobe. The 20MHz clock is used to derive the 2.5 MHz TX_CLK in 10BASE-T mode. The synthesizer is disabled when not in 10BASE-T mode. TX10 Pulse Shaper & Filter The Pulse Shaper & Filter employs a digital Finite Impulse Response filter (FIR) to pre-compensate for line distortion and to remove high frequency components in accordance with the 802.3 Standard. The Pulse Shaper & Filter is disabled when not in 10BASE-T mode. TX10 Latency When connected to appropriate magnetics the latency through the TX10 path is less than 2BT (200ns) for data transmissions. This timing is measured from the rising edge of TX_CLK to the output of the transmit magnetics. The TX10 path will not transmit up to the first two Manchester encoded bits of a data transmission, as permitted by the 802.3 Standard. RX10 Filter & RX10 Signal Detect These blocks work in unison to remove noise and to block signals that do not achieve the voltage levels specified in 802.3. Signals that do not achieve the required level are not sampled in the Clock Recovery block and are not passed to the outputs. RX10 Latency When connected to appropriate magnetics the latency through the RX10 path is less than 6BT (600ns). This timing is measured from the input of the receive magnetics to the rising edge of RX_CLK. The RX10 path may ignore up to three Manchester encoded bits at the start of data reception (802.3 allows up to 5 bits). 100Base-TX Operation 100Mb/s Data Exchange on the MII Interface 100Mb/s data is transferred across the MII with clock speeds of 25MHz. The MAC outputs data to the NWK933 via the MII interface, on the TXD[3:0] bus. This data is synchronised to the rising edge of TX_CLK. To indicate that there is valid data for transmission on the MII, the MAC sets the TX_EN signal active. This forces the NWK933 device to take in the data on the TXD[3:0] bus and replace the first octet of the MAC preamble with Start-of-Stream Delimiter (SSD) symbols to indicate the start of the Physical Layer Stream. When the data transfer across the MII is complete, the MAC deasserts the TX_EN signal and the NWK933 adds End-of-Stream Delimiters (ESD) symbols onto the end of the data stream. The complete data stream (the Physical Layer Stream) is encoded from 4 bits into 5 bits, scrambled, converted to MLT3 and driven to the TXOP and TXON pin differentially. The TX100 path is disabled when not in 100BASE-TX mode and, with the exception of the RX100 Signal Detect, the RX100 Receive Path is disabled when not in 100BASE-TX mode. 125MHz Synthesizer This synthesizer employs a phase-locked loop (PLL) to generate a 125MHz timing reference from the 25MHz reference clock. This 125MHz reference is used by the 100BASE-TX transmit function and is divided by 5 to provide a 25MHz data strobe on TX_CLK. TX_CLK is frequency and phase locked to the 25MHz reference with a small phase offset. The synthesizer is disabled when not in 100BASE-TX mode. |
Similar Part No. - NWK933 |
|
Similar Description - NWK933 |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
