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TNETX15VE 数据表(PDF) 69 Page - Texas Instruments |
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TNETX15VE 数据表(HTML) 69 Page - Texas Instruments |
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69 / 113 page  TNETX15VE VLAN-ENGINE ADDRESS-LOOKUP DEVICE SPWS028B – APRIL 1997 – REVISED SEPTEMBER 1997 69 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PRINCIPLES OF OPERATION DIO read cycle The read cycle waveforms are shown in Figure 15 and described in the following: • The TNETX15VE host register address SAD1–SAD0 is asserted while SRNW is held high. • After a setup time, ESCS goes low, initiating the read cycle. • After a delay time, with ESCS low,SDATA7–SDATA0 is released from the Z state. SDATA7–SDATA0is driven with valid data and SRDY goes low. The host can access the data. • ESCSgoes high (by the host) to signal completion of the cycle, causing SRDY to deassert. SRDY goes high for one clock cycle before going into the Z state. SDATA7–SDATA0 also goes to the Z state. ESCS Host Address SRNW SAD1–SAD0 SDATA7–SDATA0 Data SRDY Z Z Figure 15. DIO Read Cycle Waveforms |
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