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TNETA1575 数据表(PDF) 33 Page - Texas Instruments |
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TNETA1575 数据表(HTML) 33 Page - Texas Instruments |
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33 / 45 page ![]() TNETA1575 ATM SEGMENTATION AND REASSEMBLY DEVICE WITH PCI-HOST AND COPROCESSOR INTERFACES SDNS040C – MAY 1996 – REVISED JUNE 1998 33 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 operating characteristics (see Figure 15 ) traffic coprocessor interface outputs NO. PARAMETER MIN MAX UNIT 1 td(RCCX) Delay time, ATMCLK1 ↑ to RCCX valid 2 11 ns 2 td(TCCX) Delay time, ATMCLK1 ↑ to TCCX valid 2 11 ns 3 td(DAX) Delay time, ATMCLK1 ↑ to DAX valid 2 11 ns RCCX (output) ATMCLK1 (output) Frame GCI DMA Number (11 Bits) TCCX (output) Frame Send ACK DMA Number (11 Bits) Frame DAV DMA Number (11 Bits) 3 DAX (output) Sch. Source Cell Type (3 Bits) CLP .. . ... 2 2 Figure 15. Traffic Coprocessor Interface Outputs operating characteristics (see Figure 16 ) ATMCLK1/ATMCLK2 clock timing NO. PARAMETER MIN MAX UNIT 1 td(ATMCLK1) Delay time, PCLK ↑ to ATMCLK1↑ 3 7 ns 2 td(ATMCLK2) Delay time, PCLK ↑ to ATMCLK2↑ 3 7 ns ATMCLK2 (output) PCLK (input) 1 2 ATMCLK1 (output) Figure 16. ATMCLK1/ATMCLK2 Clock Timing |
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