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XRT86SH328 Datasheet(PDF) 9 Page - Exar Corporation |
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XRT86SH328 Datasheet(HTML) 9 Page - Exar Corporation |
9 / 96 page XRT86SH328 Datasheet XRT86SH328 PIN DESCRIPTIONS Datasheet 6 P1.0.1, September 1, 2005 V28 RD/ DS/ WE I READ Strobe/Data Strobe: The function of this input pin depends upon which mode the Microprocessor Interface has been configured to operate in. Intel-Asynchronous Mode - RD* - READ Strobe Input: If the Microprocessor Interface is operating in the Intel-Asynchronous Mode, then this input pin will function as the RD* (Active Low Read Strobe) input signal from the Microprocessor. Once this active-low signal is asserted, then the XRT86SH328 will place the contents of the addressed register (or buffer location) on the Microprocessor Interface Bi-directional data bus (D[7:0]). When this signal is negated, then the Data Bus will be tri-stated .Motorola-Asynchronous (68K) Mode - DS* - Data Strobe :If the Microprocessor Interface is operating in the Motorola-Asynchronous Mode, then this input pin will function as the DS* (Data Strobe) input signal. Power PC 403 Mode - WE* - Write Enable Input: If the Microprocessor Interface is operating in the Power PC 403 Mode, then this input pin will function as the WE* (Write Enable) input pin. Anytime the Microprocessor Interface samples this active-low input signal (along with CS* and WR/R/W*) also being asserted (at a logic low level) upon the rising edge of µPCLK, then the Microprocessor Interface will (upon the very same rising edge of µPCLK) latch the contents on the Bi-Directional Data Bus (D[7:0]) into the target on-chip register or buffer location within the XRT86SH328. Table 2 Microprocessor Interface - Pin Descriptions Pin/Ball Number Pin Name Type Description |
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