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IDT7206L30L Datasheet(PDF) 7 Page - Integrated Device Technology |
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IDT7206L30L Datasheet(HTML) 7 Page - Integrated Device Technology |
7 / 14 page 5.04 7 IDT7203/7204/7205/7206 CMOS ASYNCHRONOUS FIFO 2048 x 9, 4096 x 9, 8192 x 9 and 16384 x 9 MILITARY AND COMMERCIAL TEMPERATURE RANGES Outputs: FULL FLAG ( FF FF) — The Full Flag (FF) will go LOW, inhibiting further write operations, when the device is full. If the read pointer is not moved after Reset ( RS), the Full Flag (FF) will go LOW after 2048/4096/8192/16384 writes. EMPTY FLAG ( EF EF) — The Empty Flag (EF) will go LOW, inhibiting further read operations, when the read pointer is equal to the write pointer, indicating that the device is empty. EXPANSION OUT/HALF-FULL FLAG ( XO XO/HF HF) — This is a dual-purpose output. In the single device mode, when Expan- sion In ( XI)isgrounded,thisoutputactsasanindicationofahalf- full memory. After half of the memory is filled, and at the falling edge of the next write operation, the Half-Full Flag ( HF) will be set to LOW Figure 2. Reset Figure 3. Asynchronous Write and Read Operation NOTE: 1. W and R = VIH around the rising edge of RS. W RS R EF HF, FF t RSC t RS t RSS t RSS t RSR t EFL t HFH, t FFH 2661 drw 04 R W D t RC t A t WR t DS DATA 0 –D8 Q0–Q8 t DH t WPW t WC VALID t RLZ t RHZ t DV t A t RR t RPW IN VALID DATAOUT VALID DATAOUT DATA IN VALID 2661 drw 05 and will remain set until the difference between the write pointer and read pointer is less than or equal to one half of the total memory of the device. The Half-Full Flag ( HF) is then reset by the rising edge of the read operation. In the Depth Expansion Mode, Expansion In ( XI) is con- nected to Expansion Out ( XO) of the previous device. This output acts as a signal to the next device in the Daisy Chain by providing a pulse to the next device when the previous device reaches the last location of memory. There will be an XO pulse when the Write pointer reaches the last location of memory, and an additional XO pulse when the Read pointer reaches the last location of memory. DATA OUTPUTS (Q0-Q8) — Q0-Q8 are data outputs for 9- bit wide data. These outputs are in a high-impedance condition whenever Read ( R) is in a HIGH state. |
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