GS8640V18/32/36T-300/250/200/167

Synchronous Truth Table

Operation

Deselect Cycle, Power DownDeselect Cycle, Power DownDeselect Cycle, Power DownRead Cycle, Begin BurstRead Cycle, Begin BurstWrite Cycle, Begin BurstRead Cycle, Continue BurstRead Cycle, Continue BurstWrite Cycle, Continue BurstWrite Cycle, Continue BurstRead Cycle, Suspend BurstRead Cycle, Suspend BurstWrite Cycle, Suspend Burst

Address Used

NoneNoneNoneExternalExternalExternalNextNextNextNextCurrentCurrentCurrent

StateDiagramKey5

XXXRRWCRCRCWCW

E1

HLLLLLXHXHXHX

E2

XFFTTTXXXXXXX

ADSPADSC

XLHLHHHXHXHXH

LXLXLLHHHHHHH

ADV

XXXXXXLLLLHHH

WXXXXFTFFTTFFT

DQ4

High-ZHigh-ZHigh-ZQQDQQDDQQD

Write Cycle, Suspend BurstCurrentHXXHHTD1.X = Don’t Care, H = High, L = Low

2.E = T (True) if E2 = 1 and E3 = 0; E = F (False) if E2 = 0 or E3 = 1

3.W = T (True) and F (False) is defined in the Byte Write Truth Table preceding.

4.G is an asynchronous input. G can be driven high at any time to disable active output drivers. G low can only enable active drivers (shown

as “Q” in the Truth Table above).

5.All input combinations shown above are tested and supported. Input combinations shown in gray boxes need not be used to accomplish

basic synchronous or synchronous burst operations and may be avoided for simplicity.

6.Tying ADSP high and ADSC low allows simple non-burst synchronous operations. See BOLD items above.

7.Tying ADSP high and ADV low while using ADSC to load new addresses allows simple burst operations. See ITALIC items above.