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XRT79L72IB Datasheet(PDF) 7 Page - Exar Corporation |
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XRT79L72IB Datasheet(HTML) 7 Page - Exar Corporation |
7 / 72 page xr PRELIMINARY XRT79L72 2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC REV. P1.0.2 4 PIN DESCRIPTIONS PIN # NAME TYPE DESCRIPTION MICROPROCESSOR INTERFACE AB26 AC26 AD26 AB25 AA24 AD25 AC25 AB24 AF25 AE25 AF24 AE24 AD24 AC24 AF23 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 I Address Bus Input pins Microprocessor Interface: These input pins permit the Microprocessor to identify on-chip registers and Buffer/ Memory locations (within the XRT79L72 device) whenever it performs READ and WRITE operations with the XRT79L71 device. R22 T24 T25 T26 U22 U23 U24 U25 D0 D1 D2 D3 D4 D5 D6 D7 I/O Bi-Directional Data Bus pins Microprocessor Interface: These pins are used to drive and receive data over the bi-directional data bus. AB23 ALE/AS I Address Latch Enable/Address Strobe: This input pin is used to latch the address present at the Microprocessor Interface Address Bus pins A[14:0] into the Framer/UNI Microprocessor Interface block and to indicate the start of a READ or WRITE cycle. This input pin is active high, in the Intel Mode and active low in the Motorola Mode. AE23 CS I Chip Select Input: The user must assert this active low signal in order to select the Microprocessor Interface for READ and WRITE operations between the Microprocessor and the UNI/ Framer on-chip registers and RAM locations. R23 INT O Interrupt Request Output: This open-drain, active-low output signal will be asserted when the Framer/UNI device is requesting interrupt service from the Microprocessor. This output pin should typically be connected to the Interrupt Request input of the Microprocessor. AD23 RD/DS I READ Strobe Intel Mode: If the Microprocessor Interface is operating in the Intel Mode, then this input pin will function as the RD (READ Strobe) input signal from the Microprocessor. Once this active-low signal is asserted, then the Framer/UNI will place the contents of the addressed register within the Framer/UNI IC on the Microprocessor Bi-directional 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 input will function as the DS (Data Strobe) signal. |
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