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EPM7256ATC144-12

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File Size : 116 KB Manufacturer:ALTERA Description:bidirectional interface between microprocessors and/or buses with synchro- nous control. Communication between each port may bypass the FIFOs via two mailbox registers. The mailbox registers' width matches the selected bus width of ports B and C. Each mailbox register has a flag (MBF1 and MBF2) to signal when new mail has been stored. Two kinds of reset are available on these FIFOs: Master Reset and Partial Reset. Master Reset initializes the read and write pointers to the first location of the memory array and selects serial flag programming, parallel flag program- ming, or one of three possible default flag offset settings, 8, 16 or 64. Each FIFO has its own, independent Master Reset pin, MRS1 and MRS2. Partial Reset also sets the read and write pointers to the first location of the memory. Unlike Master Reset, any settings existing prior to Partial Reset (i.e., programming method and partial flag default offsets) are retained. Partial Reset is useful since it permits flushing of the FIFO memory without changing any configuration settings. Each FIFO has its own, independent Partial Reset pin, PRS1 and PRS2. These devices have two modes of operation: In the IDT Standard mode, the first word written to an empty FIFO is deposited into the memory array. A read operation is required to access that word (along with all other words residing in memory). In the First Word Fall Through mode (FWFT), the first word written to an empty FIFO appears automatically on the outputs, no read operation required (Nevertheless, accessing subsequent words does necessitate a formal read request). The state of the BE/FWFT pin during Master Reset determines the mode in use. Each FIFO has a combined Empty/Output Ready Flag (EFA/ORA and EFB/ORB) and a combined Full/Input Ready Flag (FFA/IRA and FFC/IRC). The EF and FF functions are selected in the IDT Standard mode. EF indicates whether or not the FIFO memory is empty. FF shows whether the memory is full or not. The IR and OR functions are selected in the First Word Fall Through


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	1PCS	100PCS	1K	10K
价格


型号：EPM7256ATC144-12 厂家：ALTERA 封装：260 批号：06+ 数量：QFP144 说明：


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