TMS55166 datasheet(29/70 Pages) TI

29 / 70 page

TMS55165, TMS55166, TMS55175, TMS55176

262144 BY 16-BIT MULTIPORT VIDEO RAM

SMVS463 – DECEMBER 1995

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

split-register-transfer read (continued)

QSF indicates which half of the register is being accessed during serial-access operation. When QSF is low,

the serial-address pointer is accessing the lower (least significant) 128 bits of SAM. When QSF is high, the

pointer is accessing the higher (most significant) 128 bits of SAM (see Figure 23). QSF changes state upon

completing a full-register-transfer read cycle. The tap point loaded during the current transfer cycle determines

the state of QSF. QSF also changes state when a boundary between two register halves is reached.

RAS

CAS

DSF

TRG

QSF

Tap

Point N

td(GHQSF)

Full-Register-Transfer Read

With Tap Point N

Split-Register-

Transfer Read

td(CLQSF)

NOTE A: See “timing requirements over recommended ranges of supply voltage and operating free-air

temperature” table.

Figure 22. Example of a Split-Register-Transfer Read After a Full-Register-Transfer Read

127

or 255

td(SCQSF)

RAS

CAS

DSF

TRG

QSF

Tap

Point N

Split-Register-

Transfer Read

With Tap Point N

Split-Register-

Transfer Read

td(MSRL)

td(RHMS)

NOTE A: See “timing requirements over recommended ranges of supply voltage and operating free-air

temperature” table.

Figure 23. Example of Successive Split-Register-Transfer Read Operations

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