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TNETX15VE 数据表(PDF) 68 Page - Texas Instruments |
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TNETX15VE 数据表(HTML) 68 Page - Texas Instruments |
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68 / 113 page  TNETX15VE VLAN-ENGINE ADDRESS-LOOKUP DEVICE SPWS028B – APRIL 1997 – REVISED SEPTEMBER 1997 68 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PRINCIPLES OF OPERATION DIO write cycle The write cycle waveforms are shown in Figure 14 and described in the following: • The TNETX15VE host register address (SAD1–SAD0 and SDATA7–SDATA0) is asserted and SRNW goes low. • After a setup time, ESCS goes low, initiating a write cycle. • The TNETX15VE pulls SRDY low as the data is accepted. • SDATA7–SDATA0, SAD1–SAD0, and SRNW signals are deasserted after the hold time has expired. • ESCS goes high (by the host) to complete the cycle, causing SRDY to deassert and to go high for one cycle before going into the high-impedance (Z) state. ESCS Host Address SRNW SAD1–SAD0 SDATA7–SDATA0 SRDY Data Z Z Figure 14. DIO Write Cycle Waveforms |
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