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SMJ55166 数据表(PDF) 10 Page - Texas Instruments |
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SMJ55166 数据表(HTML) 10 Page - Texas Instruments |
10 / 62 page SMJ55166 262144 BY 16-BIT MULTIPORT VIDEO RAM SGMS057C – APRIL 1995 – REVISED JUNE 1997 10 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 serial enable (SE) During serial-access operations, SE enables/disables the SQ outputs. SE low enables the serial-data output while SE high disables the serial-data output. SE is also used as an enable/disable for output pin QSF. NOTE:While SE is held high, the serial clock is not disabled. External SC pulses increment the internal serial-address counter, regardless of the state of SE. This ungated serial-clock scheme minimizes access time of serial output from SE low because the serial-clock input buffer and the serial-address counter are not disabled by SE. special-function output (QSF) QSF is an output pin that indicates which half of the SAM is being accessed. When QSF is low, the serial-address pointer accesses the lower (least significant) 128 bits of the SAM. When QSF is high, the pointer accesses the higher (most significant) 128 bits of the SAM. QSF changes state upon crossing a boundary between the two SAM halves. During full-register-transfer operations, QSF can change state upon completing the cycle. This state is determined by the tap point loaded during the transfer cycle. QSF output is enabled by SE. If SE is high, the QSF output is in the high-impedance state. no connect/ground (NC/VSS) NC/VSS must be tied to system ground or left floating for proper device operation. |
类似零件编号 - SMJ55166 |
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类似说明 - SMJ55166 |
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