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72T7295L6-7BBG Datasheet(PDF) 7 Page - Integrated Device Technology |
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72T7295L6-7BBG Datasheet(HTML) 7 Page - Integrated Device Technology |
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7 / 53 page  7 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES IDT72T7285/72T7295/72T72105/72T72115 2.5V TeraSync ™ ™ ™ ™ ™ 72-BIT FIFO 16,384 x 72, 32,768 x 72, 65,536 x 72, 131,072 x 72 PIN DESCRIPTION (CONTINUED) Symbol Name I/O TYPE Description PAE Programmable HSTL-LVTTL PAE goes LOW if the number of words in the FIFO memory is less than offset n, which is stored in the Almost-EmptyFlag OUTPUT Empty Offset register. PAE goes HIGH if the number of words in the FIFO memory is greater than or equal tooffsetn. PAF Programmable HSTL-LVTTL PAF goes HIGH if the number of free locations in the FIFO memory is more than offset m, which is stored in Almost-FullFlag OUTPUT the Full Offset register. PAFgoesLOWifthenumberoffreelocationsintheFIFOmemoryislessthanorequal tom. PFM(1) Programmable LVTTL During Master Reset, a LOW on PFM will select Asynchronous Programmable flag timing mode. A HIGH on Flag Mode INPUT PFM will select Synchronous Programmable flag timing mode. PRS PartialReset HSTL-LVTTL PRSinitializesthereadandwritepointerstozeroandsetstheoutputregistertoallzeroes.DuringPartialReset, INPUT the existing mode (IDT or FWFT), programming method (serial or parallel), and programmable flag settings are all retained. Q0–Q71 DataOutputs HSTL-LVTTL Data outputs for an 72-, 36- or 18-bit bus. When in 36- or 18-bit mode, any unused output pins should not OUTPUT be connected. Outputs are not 3.3V tolerant regardless of the state of OE and RCS. RCLK/ Read Clock/ HSTL-LVTTL If Synchronous operation of the read port has been selected, when enabled by REN,therisingedgeofRCLK RD Read Strobe INPUT readsdatafromtheFIFOmemoryandoffsetsfromtheprogrammableregisters.If LDisLOW,thevaluesloaded into the offset registers is output on a rising edge of RCLK. If Asynchronous operation of the read port has been selected, a rising edge on RD reads data from the FIFO in an Asynchronous manner. REN should be tiedLOW. RCS Read Chip Select HSTL-LVTTL RCSprovidessynchronouscontrolofthereadportandoutputimpedanceofQn,synchronoustoRCLK.During INPUT aMasterResetorPartialResetthe RCSinputisdon’tcare,ifOEisLOWthedataoutputswillbeLow-Impedance regardless of RCS. REN Read Enable HSTL-LVTTL If Synchronous operation of the read port has been selected, REN enables RCLK for reading data from the INPUT FIFO memory and offset registers. If Asynchronous operation of the read port has been selected, the REN input should be tied LOW. RHSTL(1) Read Port HSTL LVTTL This pin is used to select HSTL or 2.5V LVTTL outputs for the FIFO. If HSTL or eHSTL outputs are Select INPUT required, this input must be tied HIGH. Otherwise it should be tied LOW. RT Retransmit HSTL-LVTTL RT asserted on the rising edge of RCLK initializes the READ pointer to zero, sets the EF flag to LOW (OR to INPUT HIGH in FWFT mode) and doesn’t disturb the write pointer, programming method, existing timing mode or programmable flag settings. If a mark has been set via the MARK input pin, then the read pointer will jump to the‘mark’location. SCLK Serial Clock HSTL-LVTTL A rising edge on SCLK will clock the serial data present on the SI input into the offset registers providing that INPUT SEN is enabled. SEN Serial Enable HSTL-LVTTL SENenablesserialloadingofprogrammableflagoffsets. INPUT SHSTL System HSTL LVTTL All inputs not associated with the write or read port can be selected for HSTL operation via the SHSTL input. Select INPUT TCK(2) JTAG Clock HSTL-LVTTL Clock input for JTAG function. One of four terminals required by IEEE Standard 1149.1-1990. Test operations INPUT of the device are synchronous to TCK. Data from TMS and TDI are sampled on the rising edge of TCK and outputs change on the falling edge of TCK. If the JTAG function is not used this signal needs to be tied to GND. TDI(2) JTAG Test Data HSTL-LVTTL One of four terminals required by IEEE Standard 1149.1-1990. During the JTAG boundary scan operation, Input INPUT test data serially loaded via the TDI on the rising edge of TCK to either the Instruction Register, ID Register and Bypass Register. An internal pull-up resistor forces TDI HIGH if left unconnected. TDO(2) JTAG Test Data HSTL-LVTTL One of four terminals required by IEEE Standard 1149.1-1990. During the JTAG boundary scan operation, Output OUTPUT test data serially loaded output via the TDO on the falling edge of TCK from either the Instruction Register, ID Register and Bypass Register. This output is high impedance except when shifting, while in SHIFT-DR and SHIFT-IR controller states. TMS(2) JTAG Mode HSTL-LVTTL TMS is a serial input pin. One of four terminals required by IEEE Standard 1149.1-1990. TMS directs the Select INPUT the device through its TAP controller states. An internal pull-up resistor forces TMS HIGH if left unconnected. |
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