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參數(shù)資料
| 型號： | IDT72V845L15PFI8 |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數(shù)： | 24/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC FIFO SYNC 4096X18 128QFP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 系列： | 72V |
| 功能： | 異步，同步 |
| 存儲容量： | 72K（4K x 18） |
| 數(shù)據(jù)速率： | 67MHz |
| 訪問時間： | 15ns |
| 電源電壓： | 3 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 128-LQFP |
| 供應(yīng)商設(shè)備封裝： | 128-TQFP（14x20） |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | 72V845L15PFI8 |
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IDT72V805/72V815/72V825/72V835/72V845
3.3 V CMOS DUAL SyncFIFO 256 x 18, 512 x 18, 1,024 x 18, 4,096 x 18
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
7
FEBRUARY 11, 2009
Number of Words in FIFO
IDT72V805
IDT72V815
IDT72V825
IDT72V835
IDT72V845
IR PAF HF PAE OR
00
0
L
H
L
H
1 to (n + 1)(1)
LH
HL
L
(n + 2) to 129
(n + 2) to 257
(n + 2) to 513
(n + 2) to 1,025
(n + 2) to 2,049
L
H
L
130 to (257-(m+1))(2)
258 to (513-(m+1))(2)
514 to (1,025-(m+1))(2)
1,026 to (2,049-(m+1))(2)
2,050 to (4,097-(m+1))(2)
LHLHL
(257-m) to 256
(513-m) to 512
(1,025-m) to 1,024
(2,049-m) to 2,048
(4,097-m) to 4,096
LL
L
H
L
257
513
1,025
2,049
4,097
H
L
H
L
normal read/write operation. When the
LD pin and WEN are again set LOW,
the next offset register in sequence is written.
The contents of the offset registers can be read on the data output lines
Q0-Q11 when the
LD pin is set LOW and REN is set LOW. Data can then
be read on the next LOW-to-HIGH transition of RCLK. The first transition
of RCLK will present the Empty Offset value to the data output lines. The
next transition of RCLK will present the Full Offset value. Offset register
content can be read out in the IDT Standard mode only. It cannot be read
in the FWFT mode.
SYNCHRONOUS VS ASYNCHRONOUS PROGRAMMABLE FLAG
TIMING SELECTION
The IDT72V805/72V815/72V825/72V835/72V845 can be configured
during the "Configuration at Reset" cycle described in Table 3 with either
asynchronous or synchronous timing for
PAE and PAF flags.
If asynchronous
PAE/PAF configuration is selected (as per Table 3), the
PAE is asserted LOW on the LOW-to-HIGH transition of RCLK. PAE is reset
to HIGH on the LOW-to-HIGH transition of WCLK. Similarly, the
PAF is
asserted LOW on the LOW-to-HIGH transition of WCLK and
PAF is reset
to HIGH on the LOW-to-HIGH transition of RCLK. For detail timing dia-
grams, see Figure 13 for asynchronous
PAE timing and Figure 14 for
asynchronous
PAF timing.
If synchronous
PAE/PAF configuration is selected , the PAE is asserted
and updated on the rising edge of RCLK only and not WCLK. Similarly,
PAF
is asserted and updated on the rising edge of WCLK only and not RCLK. For
detail timing diagrams, see Figure 22 for synchronous
PAE timing and
Figure 23 for synchronous
PAF timing.
REGISTER-BUFFERED FLAG OUTPUT SELECTION
The IDT72V805/72V815/72V825/72V835/72V845 can be configured
during the "Configuration at Reset" cycle described in Table 4 with single,
double or triple register-buffered flag output signals. The various combina-
tions available are described in Table 4 and Table 5. In general, going from
single to double or triple buffered flag outputs removes the possibility of
metastable flag indications on boundary states (i.e, empty or full condi-
tions). The trade-off is the addition of clock cycle delays for the respective
flag to be asserted. Not all combinations of register-buffered flag outputs
are supported. Register-buffered outputs apply to the Empty Flag and Full
Flag only. Partial flags are not effected. Table 4 and Table 5 summarize
the options available.
TABLE 1 — STATUS FLAGS FOR IDT STANDARD MODE
Number of Words in FIFO
IDT72V805
IDT72V815
IDT72V825
IDT72V835
IDT72V845
FF PAF HF PAE EF
00
0
H
L
1 to n(1)
HH
H
L
H
(n + 1) to 128
(n + 1) to 256
(n + 1) to 512
(n + 1) to 1,024
(n + 1) to 2,048
H
129 to (256-(m+1))(2)
257 to (512-(m+1))(2)
513 to (1,024-(m+1))(2)
1,025 to (2,048-(m+1))(2)
2,049 to (4,096-(m+1))(2)
HH
L
H
(256-m) to 255
(512-m) to 511
(1,024-m) to 1,023
(2,048-m) to 2,047
(4,096-m) to 4,095
H
L
H
256
512
1,024
2,048
4,096
L
H
TABLE 2 — STATUS FLAGS FOR FWFT MODE
NOTES:
1. n = Empty Offset (Default Values : IDT72V805 n=31, IDT72V815 n = 63, IDT72V825/72V835/72V845 n = 127)
2. m = Full Offset (Default Values : IDT72V805 m=31, IDT72V815 m = 63, IDT72V825/72V835/72V845 m = 127)
NOTES:
1. n = Empty Offset (Default Values : IDT72V805 n = 31, IDT72V815 n = 63, IDT72V825/72V835/72V845 n = 127)
2. m = Full Offset (Default Values : IDT72V805 m = 31, IDT72V815 m = 63, IDT72V825/72V835/72V845 m = 127)
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