IDT72V3650 Integrated Device Technology, IDT72V3650 Datasheet - Page 35

• Manufacturer Part Number: IDT72V3650
• Description: 2k X 36 Supersync Ii Fifo, 3.3v
• Manufacturer: Integrated Device Technology

NOTES:
1. m = PAF offset.
2. D = maximum FIFO Depth.
3. PAF is asserted to LOW on WCLK transition and reset to HIGH on RCLK transition.
4. Select this mode by setting PFM LOW during Master Reset.
WCLK
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.
WCLK
IDT72V3640/50/60/70/80/90 3.3V HIGH DENSITY SUPERSYNC II
1,024 x 36, 2,048 x 36, 4,096 x 36, 8,192 x 36, 16,384 x 36 and 32,768 x 36
RCLK
RCLK
WEN
WEN
REN
REN
In IDT Standard Mode: D = 1,024 for the IDT72V3640, 2,048 for the IDT72V3650, 4,096 for the IDT72V3660, 8,192 for the IDT72V3670, 16,384 for the IDT72V3680 and 32,768
for the IDT72V3690.
In FWFT Mode: D = 1,025 for the IDT72V3640, 2,049 for the IDT72V3650, 4,097 for the IDT72V3660, 8,193 for the IDT72V3670, 16,385 for the IDT72V3680 and 32,769 for the
IDT72V3690.
PAE
WCLK and the rising edge of RCLK is less than t
PAF
SKEW2
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
CLKH
Figure 19. Synchronous Programmable Almost-Empty Flag Timing (IDT Standard and FWFT Modes)
Figure 20. Asynchronous Programmable Almost-Full Flag Timing (IDT Standard and FWFT Modes)
t
ENS
n words in FIFO
n+1 words in FIFO
t
CLKL
D - (m + 1) words in FIFO
t
ENH
t
(2)
SKEW2
1
,
(3)
t
CLKH
SKEW2
(4)
, then the PAE deassertion may be delayed one extra RCLK cycle.
t
PAES
2
t
ENS
TM
t
CLKL
35
36-BIT FIFO
t
ENS
t
t
ENH
PAFA
n+1 words in FIFO
n+2 words in FIFO
t
ENS
t
ENH
D - m words
in FIFO
(2)
(3)
,
t
PAFA
1
COMMERCIAL AND INDUSTRIAL
PAES
t
PAES
). If the time between the rising edge of
TEMPERATURE RANGES
D - (m + 1) words
2
in FIFO
n words in FIFO
n+1 words in FIFO
APRIL 6, 2006
4667 drw25
4667 drw24
(2)
,
(3)