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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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XRT7250 датащи(PDF) 23 Page - Exar Corporation |
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XRT7250 датащи(HTML) 23 Page - Exar Corporation |
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23 / 463 page  XRT7250 DS3/E3 FRAMER IC áç áç áç áç REV. 1.1.1 4 10 RD_DS I Read Data Strobe (Intel Mode) If the microprocessor interface is operating in the Intel Mode, then this input will function as the RD (READ STROBE) input signal from the local µP. Once this active-low signal is asserted, then the Framer will place the contents of the addressed registers (within the Framer) on the Microprocessor Data Bus (D[7:0]). When this signal is negated, the Data Bus will be tri-stated. Data Strobe (Motorola Mode): If the microprocessor interface is operating in the Motorola mode, then this pin will function as the active-low Data Strobe signal. 11 NC Not Bonded Out 12 NC Not Bonded Out 13 INT O Interrupt Request Output: This open-drain, active-low output signal will be asserted when the Framer device is requesting interrupt service from the local microprocessor. This out- put pin should typically be connected to the "Interrupt Request" input of the local microprocessor. 14 GND Ground Pin 15 A0 I Address Bus Input (Microprocessor Interface) - LSB (Least Signif- icant Bit) (Please see description for A8) 16 A1 I Address Bus Input (Microprocessor Interface): (Please see description for A8) 17 A2 I Address Bus Input (Microprocessor Interface): (Please see description for A8) 18 A3 I Address Bus Input (Microprocessor Interface): (Please see description for A8) 19 A4 I Address Bus Input (Microprocessor Interface): (Please see description for A8) 20 A5 I Address Bus Input (Microprocessor Interface): (Please see description for A8) 21 A6 I Address Bus Input (Microprocessor Interface): (Please see description for A8) 22 A7 I Address Bus Input (Microprocessor Interface): (Please see description for A8) 23 A8 I Address Bus Input (Microprocessor Interface) - MSB (Most Signif- icant Bit): This input pin, along with inputs A0 - A7 are used to select the on-chip Framer register and RAM space for READ/WRITE operations with the "local" micropro- cessor. 24 VDD **** Power Supply Pin PIN DESCRIPTION PIN #NAME TYPE DESCRIPTION |
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