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| 型號(hào)： | SMJ55161 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 262144 BY 16-BIT MULTIPORT VIDEO RAM |
| 中文描述： | 262144由16位多端口視頻內(nèi)存 |
| 文件頁(yè)數(shù)： | 10/64頁(yè) |
| 文件大?。?/td> | 1505K |
| 代理商： | SMJ55161 |
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SMJ55161
262144 BY 16-BIT
MULTIPORT VIDEO RAM
SGMS056D – MAY 1995 – REVISED OCTOBER 1997
10
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
serial enable (SE)
During serial-access operations, SE is used as an enable/disable for 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.
IMPORTANT: 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 is accessing the lower (least significant) 128 bits of the serial register (SAM). When QSF is high, the
pointer is accessing the higher (most significant) 128 bits of the SAM.
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 is enabled by SE; therefore, if SE is high, the
QSF output is in the high-impedance state.
no connect / ground (NC/GND)
NC/GND must be tied to system ground or left floating for proper device operation.
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