參數(shù)資料
型號: IDT72T54252L5BBI
廠商: INTEGRATED DEVICE TECHNOLOGY INC
元件分類: DRAM
英文描述: 2.5V QUAD/DUAL TeraSync⑩ DDR/SDR FIFO x10 QUAD FIFO or x10/x20 DUAL FIFO CONFIGURATIONS
中文描述: 256K X 10 OTHER FIFO, 3.6 ns, PBGA324
封裝: 19 X 19 MM, 1 MM PITCH, PLASTIC, BGA-324
文件頁數(shù): 53/56頁
文件大小: 555K
代理商: IDT72T54252L5BBI
53
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
IDT72T54242/72T54252/72T54262 2.5V QUAD/DUAL TeraSync
DDR/SDR FIFO
32K x 10 x 4/16K x 20 x 2, 64K x 10 x 4/32K x 20 x 2 and 128K x 10 x 4/64K x 20 x 2
MARCH 22, 2005
WCLK0
WEN
0
PAF
0
RCLK0
REN
0
6158 drw36
1
2
1
2
D-(m0+1) words
in FIFO
(2)
D - m0 words in FIFO
(2)
D - (m0 +1) words in FIFO
(2)
t
ENH
t
ENS
t
PAFS
t
ENS
t
ENH
t
CLKL
t
SKEW3
(4)
t
PAFS
t
CLKL
WCLK0
WEN
0
PAE
0
RCLK0
1
2
1
2
REN
0
6158 drw37
n0 + 1 words in FIFO
(3)
,
n0 + 2 words in FIFO
(4)
t
ENS
t
SKEW3
(5)
t
ENH
t
PAES
n0 words in FIFO
(3)
,
n0 + 1 words in FIFO
(4)
t
PAES
n0 words in FIFO
(3)
,
n0 + 1 words in FIFO
(4)
t
ENS
t
ENH
t
CLKH
t
CLKL
NOTES:
1. The timng diagramshown is for FIFO0. FIFO1-3 exhibit the same behavior.
2. m0 =
PAF
0 offset .
2. D = maximumFIFO depth. For density of FIFO with bus-matching, refer to the bus-matching section on page 19.
4. t
SKEW3
is the mnimumtime between a rising RCLK0 edge and a rising WCLK0 edge to guarantee that
PAF
0 will go HIGH (after one WCLK0 cycle plus t
PAFS
). If the time
between the rising edge of RCLK0 and the rising edge of WCLK0 is less than t
SKEW2
, then the
PAF
0 deassertion time may be delayed one extra WCLK0 cycle.
5.
PAF
0 is asserted and updated on the rising edge of WCLK0 only.
6.
RCS
0 = LOW, and
WCS
0 = LOW.
7.
MD
IW
OW
WDDR
RDDR
PFM
1
D/C
D/C
0
0
1
Figure 31. Synchronous Programmable Almost-Full Flag Timing (Quad mode, IDT Standard and FWFT mode, SDR to SDR)
NOTES:
1. The timng diagramshown is for FIFO0. FIFO1-3 exhibit the same behavior.
2. n0 =
PAE
0 offset.
3. For IDT Standard mode
4. For FWFT mode.
5.
t
SKEW3
is the mnimumtime between a rising WCLK0 edge and a rising RCLK0 edge to guarantee that
PAE
0
will go HIGH (after one RCLK0 cycle plus t
PAES
). If the time between
the rising edge of WCLK0 and the rising edge of RCLK0 is less than t
SKEW3
, then the
PAE
0
deassertion may be delayed one extra RCLK0 cycle.
6.
PAE
0 is asserted and updated on the rising edge of RCLK0 only.
7.
RCS
0 = LOW, and
WCS
0 = LOW.
8.
MD
IW
OW
WDDR
RDDR
PFM
1
D/C
D/C
0
0
1
Figure 32. Synchronous Programmable Almost-Empty Flag Timing (Quad mode, IDT Standard and FWFT mode, SDR to SDR)
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