tc59ym916bkg24a ETC-unknow, tc59ym916bkg24a Datasheet - Page 69

• Manufacturer Part Number: tc59ym916bkg24a
• Description: The Second Generation 512-megabit Xdrtm Dram
• Manufacturer: ETC-unknow

DRSL DQ Transmit Timing
memory component. This diagram represents a magnified view of these pins and only a few clock cycles are shown
(CFM and CFMN are the clock signals). Timing events are measured to and from the primary CFM/CFMN crossing
point in which CFM makes its high−voltage−to−low−voltage transition. The DQ15…DQ0/DQN15…DQN0 signals
are high-true: a low voltage represents a logical zero and a high voltage represents a logical one. They are also
differential — timing events on the DQ15…DQ0/DQN15…DQN0 pins are measured to and from the point that each
differential pair crosses.
The rise (t
levels.
windows for a particular DQi/DQNi pin pair is referenced to an offset parameter t
on the values {0, 1, ..15} and refers to each of the DQ15…DQ0/DQN15…DQN0 pin pairs).
the offset point for the DQi/DQNi pin pair. The 16 receiving windows are placed at times t
(j / 8) × t
DQi/DQNi pin pair).
to lie inside the range {t
not change during system operation. Its value can be determined at initialization time.
begins at the time (t
(( j ) / 8) × t
begins at the time (t
/ 8) × t
Figure 60 shows a timing diagram for transmitting read data on the DQ15…DQ0/DQN15…DQN0 data pins of the
Because timing intervals are measured in this fashion, it is necessary to constrain the slew rate of the signals.
There are 16 data transmit windows defined for each DQ15…DQ0/DQN15…DQN0 pin pair. The transmitting
The t
The offset values t
The 16 transmit windows (j = 1…16) for the first pair DQ0/DQN0 are labeled “1” through “16”. Each window
The 16 transmit windows (j=1…16) for the other pairs DQi/DQNi are also labeled “1” through “16”. Each window
CYCLE
QOFF,DQi
20% = V
80% = V
CYCLE
OR,DQ
CYCLE
) measured after the primary CFM/CFMN crossing point.
OL,DQ
OL,DQ
(the index “j” may take on the values {1, 2, ..16} and refers to each of the transmit windows for the
) and fall time (t
+ t
) measured after the primary CFM/CFMN crossing point.
Q,DQ, MAX
QOFF,DQi
QOFF,DQ0
QOFF,DQi
+ 0.2 × (V
+ 0.8 × (V
QOFF,MIN,
for each of the 15 DQi/DQNi pin pairs can be different. However, each is constrained
+ t
expression determines the time between the primary CFM/CFMN crossing point and
+ t
OH,DQ
OH,DQ
OF,DQ
Q,DQ,MAX
Q,DQ, MAX
t
QOFF,MAX
−V
−V
) of the signals are measured from the 20% and 80% points of the full-swing
OL,DQ
OL,DQ
+ (j/8) × t
+ (j−1 / 8) × t
}. Furthermore, each offset value t
)
)
TC59YM916BKG24A,32A,32B,40B,32C,40C
CYCLE
CYCLE
) and ends at the time (t
) and ends at the time (t
QOFF,DQi
QOFF,DQi
QOFF,DQi
QOFF,DQ0
QOFF,DQi
2004-12-15 69/76
is static; its value will
(the index “i” may take
+ t
Q,DQ, MIN
+ t
+ t
Q,DQ,MIN
Q,DQ, MAX
Rev 0.1
+ ((j + 1)
+
+