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SMCP-67206HV-30SCC Datasheet(PDF) 5 Page - ATMEL Corporation |
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SMCP-67206HV-30SCC Datasheet(HTML) 5 Page - ATMEL Corporation |
5 / 20 page 5 M67206H 4143J–AERO–04/07 Expansion Out/Half-Full Flag (XO/HF) The XO/HF pin is a dual-purpose output. In the single device mode, when Expansion In (XI) is connected to ground, this output acts as an indication of a half-full memory. After half the memory is filled and on the falling edge of the next write operation, the Half-Full Flag (HF) will be set to low and will remain set until the difference between the write and read pointers is less than or equal to 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 connected 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 memory location. Data Output (Q0 - Q8) DATA output for 9-bit wide data. This data is in a high impedance condition whenever Read (R) is in a high state. |
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