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TNETX3151 数据表(PDF) 52 Page - Texas Instruments |
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TNETX3151 数据表(HTML) 52 Page - Texas Instruments |
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52 / 65 page  TNETX3151 ThunderSWITCH ™ 12/3 ETHERNET™ SWITCH WITH 12 10-MBIT/S PORTS AND 3 10-/100-MBIT/S PORTS SPWS048A – MARCH 1998 – REVISED APRIL 1999 52 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 10-Mbit/s interface (ports 04–15) timing requirements (see Notes 3 through 6 and Figure 12)† NO. MIN MAX UNIT 1 tc(THxCLK) Cycle time, THxCLK 50 58 ns 2 Tw(THxCLK) Pulse duration, THxCLK high or low 23 27 ns 3 tsu(THxSYNC) Setup time, THxSYNC high before THxCLK ↓ 8 ns 4 tsu(THxCOL) Setup time, THxCOL high before THxCLK ↑ 8 ns 4 tsu(THxCRS) Setup time, THxCRS high before THxCLK ↑ 8 ns 4 tsu(THxLINK) Setup time, THxLINK high before THxCLK ↑ 8 ns 4 tsu(THxRXD) Setup time, THxRXD3–THxRXD0 valid before THxCLK ↑ 8 ns 4 tsu(THxRXDV) Setup time, THxRXDV high before THxCLK ↑ 8 ns 5 th(THxSYNC) Hold time, THxSYNC high after THxCLK ↓ 8 ns 6 th(THxCOL) Hold time, THxCOL high after THxCLK ↑ 8 ns 6 th(THxCRS) Hold time, THxCRS high after THxCLK ↑ 8 ns 6 th(THxLINK) Hold time, THxLINK high after THxCLK ↑ 8 ns 6 th(THxRXD) Hold time, THxRXD3–THxRXD0 valid after THxCLK ↑ 8 ns 6 th(THxRXV) Hold time, THxRXDV high after THxCLK ↑ 8 ns tr(THxCLK) Rise time, THxCLK 2 ns tf(THxCLK) Fall time, THxCLK 2 ns † THx = TH1 and TH2 NOTES: 3. The TNETE2008 must supply at least two THxSYNC pulses under normal conditions before driving valid data on the inputs to the TNETX3151, or before expecting valid data on the outputs from the TNETX3151. This means that at least two full sequences must be executed; only with the third THxSYNC pulse is valid data presented/expected. 4. At least two clocks must be driven before the deassertion of the system reset signal, and a minimum of two clocks must be driven after the deassertion of the the system reset signal to ensure complete initialization of the internal circuitry of the TNETX3151 before there is any valid activity across the interface. 5. For receive data, the TNETE2008 asserts the THxCOL signal during the appropriate slot time if it was asserted for any of the four bits of data corresponding to that slot time. 6. For receive data, the TNETE2008 asserts the THxRXDV signal only if there are four valid bits of data in the nibble. operating characteristics over recommended operating conditions (see Notes 3 through 6 and Figure 12)† NO. PARAMETER MIN MAX UNIT 7 td(THxEN) Delay time, from THxCLK ↑ to THxTXEN↑ 13.5 ns 7 td(THxTXD) Delay time, from THxCLK ↑ to THxTXD3–THxTXD0 valid 13.5 ns 7 td(THxRENEG) Delay time, from THxCLK ↑ to THxRENEG↓ 13.5 ns 8 td(THxTXEN) Delay time, from THxCLK ↑ to THxTXEN↓ 0 ns 8 td(THxTXD) Delay time, from THxCLK ↑ to THxTXD3–THxTXD0 invalid 0 ns 8 td(THxRENEG) Delay time, from THxCLK ↑ to THxRENEG↑ 0 ns † THx = TH1 and TH2 NOTES: 3. The TNETE2008 must supply at least two THxSYNC pulses under normal conditions before driving valid data on the inputs to the TNETX3151, or before expecting valid data on the outputs from the TNETX3151. This means that at least two full sequences must be executed; only with the third THxSYNC pulse is valid data presented/expected. 4. At least two clocks must be driven before the deassertion of the system reset signal, and a minimum of two clocks must be driven after the deassertion of the the system reset signal to ensure complete initialization of the internal circuitry of the TNETX3151 before there is any valid activity across the interface. 5. For receive data, TNETE2008 asserts the THxCOL signal during the appropriate slot time if it was asserted for any of the four bits of data corresponding to that slot time. 6. For receive data, the TNETE2008 asserts the THxRXDV signal only if there are four valid bits of data in the nibble. |
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