
November 22, 2004 S71PL254/127/064/032J_00_A6
7
A d v a n c e I n f o r m a t i o n
is Low, Ignore UB#/LB# Timing)........................................ 161
Figure 82. Timing Waveform of Write Cycle(1) (WE# controlled, if
BYTE# is Low, Ignore UB#/LB# Timing).............................. 161
Figure 83. Timing Waveform of Write Cycle(2) (CS# controlled, if
BYTE# is Low, Ignore UB#/LB# Timing).............................. 162
Figure 84. Timing Waveform of Write Cycle(3) (UB#, LB#
controlled) ...................................................................... 162
Figure 85. Data Retention Waveform .................................. 163
pSRAM Type 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
Functional Description . . . . . . . . . . . . . . . . . . . . 164
Absolute Maximum Ratings . . . . . . . . . . . . . . . . 164
Timing Test Conditions . . . . . . . . . . . . . . . . . . . 170
Output Load Circuit .........................................................................................171
Figure 86. Output Load Circuit ........................................... 171
Power Up Sequence . . . . . . . . . . . . . . . . . . . . . . . 171
Timing Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . 183
Read Cycle ..........................................................................................................183
Figure 87. Timing of Read Cycle (CE# = OE# = V
IL
, WE# = ZZ# =
V
IH
)................................................................................ 183
Figure 88. Timing Waveform of Read
Cycle (WE# = ZZ# = V
IH
)................................................ 184
Figure 89. Timing Waveform of Page Mode Read Cycle (WE# = ZZ#
= V
IH
)............................................................................ 185
Write Cycle .........................................................................................................186
Figure 90. Timing Waveform of Write Cycle (WE# Control, ZZ# =
V
IH
)............................................................................... 186
Figure 91. Timing Waveform of Write Cycle (CE# Control, ZZ# =
V
IH
)............................................................................... 186
Figure 92. Timing Waveform of Page Mode Write Cycle (ZZ# = V
IH
)
187
Partial Array Self Refresh (PAR) ..................................................................188
Temperature Compensated Refresh (for 64Mb) ...................................188
Deep Sleep Mode .............................................................................................188
Reduced Memory Size (for 32M and 16M) ................................................ 188
Other Mode Register Settings (for 64M) ...................................................189
Figure 93. Mode Register.................................................. 189
Figure 94. Mode Register Update Timings (UB#, LB#, OE# are
Don’t Care)..................................................................... 190
Figure 95. Deep Sleep Mode - Entry/Exit Timings................. 190
Revision Summary