IDT72T72115 Integrated Device Technology, IDT72T72115 Datasheet - Page 43

• Manufacturer Part Number: IDT72T72115
• Description: 128k X 72 Terasync Fifo, 2.5v - Best Value!
• Manufacturer: Integrated Device Technology

NOTES:
1. m = PAF offset.
2. D = maximum FIFO depth.
3. t
4. PAF is asserted and updated on the rising edge of WCLK only.
5. Select this mode by setting PFM HIGH during Master Reset.
NOTES:
1. n = PAE offset.
2. For IDT Standard mode
3. For FWFT mode.
4. t
5. PAE is asserted and updated on the rising edge of WCLK only.
6. Select this mode by setting PFM HIGH during Master Reset.
7. RCS = LOW.
WCLK
RCLK
WCLK
IDT72T7285/72T7295/72T72105/72T72115 2.5V TeraSync™ ™ ™ ™ ™ 72-BIT FIFO
16,384 x 72, 32,768 x 72, 65,536 x 72, 131,072 x 72
RCLK
WEN
REN
PAF
WEN
rising edge of WCLK and the rising edge of RCLK is less than t
In IDT Standard mode: D = 16,384 for the IDT72T7285, 32,768 for the IDT72T7295, 65,536 for the IDT72T72105 and 131,072 for the IDT72T72115.
In FWFT mode: D = 16,385 for the IDT72T7285, 32,769 for the IDT72T7295, 65,537 for the IDT72T72105 and 131,073 for the IDT72T72115.
rising edge of RCLK and the rising edge of WCLK is less than t
REN
SKEW2
SKEW2
PAE
is the minimum time between a rising RCLK edge and a rising WCLK edge to guarantee that PAF will go HIGH (after one WCLK cycle plus t
is the minimum time between a rising WCLK edge and a rising RCLK edge to guarantee that PAE will go HIGH (after one RCLK cycle plus t
t
CLKH
t
CLKL
Figure 24. Synchronous Programmable Almost-Empty Flag Timing (IDT Standard and FWFT Modes)
Figure 23. Synchronous Programmable Almost-Full Flag Timing (IDT Standard and FWFT Modes)
t
ENS
t
ENS
n words in FIFO
n + 1 words in FIFO
t
CLKL
D - (m +1) words in FIFO
t
CLKL
t
ENH
(2)
t
SKEW2
,
1
(3)
t
ENH
(4)
t
PAES
(2)
1
2
SKEW2
SKEW2
, then the PAF deassertion time may be delayed one extra WCLK cycle.
, then the PAE deassertion may be delayed one extra RCLK cycle.
2
43
t
PAFS
t
ENS
t
ENS
n + 1 words in FIFO
n + 2 words in FIFO
t
ENH
t
SKEW2
(2)
(3)
t
D - m words in FIFO
ENH
,
(3)
1
1
COMMERCIAL AND INDUSTRIAL
(2)
t
PAES
TEMPERATURE RANGES
PAES
2
PAFS
2
t
PAFS
). If the time between the
). If the time between the
n words in FIFO
n + 1 words in FIFO
D-(m+1) words
in FIFO
5994 drw29
5994 drw28
(2)
(2)
,
(3)