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TNETX3150 データシート(PDF) 62 Page - Texas Instruments |
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TNETX3150 データシート(HTML) 62 Page - Texas Instruments |
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62 / 113 page  TNETX3150/TNETX3150A ThunderSWITCH™ 15-PORT 10-/100-MBIT/S ETHERNET™ SWITCH SPWS027F – FEBRUARY 1997 – REVISED SEPTEMBER 1997 62 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 LED interface (continued) With LEDSTR0 and LEDSTR1 high, the LED latch is transparent and the LEDs are on. When RESET is released, a normal LED cycle is initiated with LEDDATA held low and LEDSTR0 pulsed. The LEDs remain on until the START bit is set (an LED cycle updating LEDSTR1 is not performed). When the START option bit is set, the TNETX3150/TNETX3150A initiates another LED cycle with LEDDATA held high, extinguishing the LEDs. TNETX3150/TNETX3150A 74ACT374 Shift Register 74ACT373 Latch 74ACT374 Shift Register 74ACT373 Latch 74ACT374 Shift Register 74ACT373 Latch 74ACT374 Shift Register 74ACT373 Latch LED Matrix LED Matrix LEDCLK LEDDATA LEDSTR0 LEDSTR1 LED Status Display Transmit Queue Status Display Figure 22. LED Interface When a change is detected in the port status or transmit queue congestion status, the interface updates the LED data. Sixteen bits of status are shifted out serially at each update. The 16th bit is reserved. The LEDSTR0 or LEDSTR1 signal is pulsed once upon completion of the shift to latch the data. See the timing diagram in Figure 42. JTAG interface The TNETX3150/TNETX3150A is fully JTAG compliant with one exception; they do require external pullup resistors on the following terminals: TDI, TMS, and TRST. external pullup resistors To implement internal pullup resistors, the TNETX3150/TNETX3150A would require the use of non-5V-tolerant input pads. The use of 5V-tolerant pads was deemed more important for mixed-voltage system boards than to integrate the required pullup resistors to be in strict compliance with the JTAG specification. |
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