参数资料
型号: IDT72261LA20PFI
厂商: IDT, Integrated Device Technology Inc
文件页数: 26/27页
文件大小: 0K
描述: IC FIFO 8192X18 LP 20NS 64QFP
标准包装: 90
系列: 7200
功能: 同步
存储容量: 144K(8K x 18)
数据速率: 50MHz
访问时间: 20ns
电源电压: 4.5 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 64-LQFP
供应商设备封装: 64-TQFP(14x14)
包装: 托盘
其它名称: 72261LA20PFI
8
COMMERCIALANDINDUSTRIAL
TEMPERATURERANGES
IDT72261LA/72271LA SuperSync FIFO
16,384 x 9 and 32,768 x 9
NOTES:
1. n = Empty Offset, Default Values: n = 127 when parallel offset loading is selected or n = 1,023 when serial offset loading is selected.
2. m = Full Offset, Default Values: m = 127 when parallel offset loading is selected or m = 1,023 when serial offset loading is selected.
PROGRAMMING FLAG OFFSETS
Full and Empty Flag offset values are user programmable. The
IDT72261LA/72271LA has internal registers for these offsets. Default
settings are stated in the footnotes of Table 1 and Table 2. Offset values
can be programmed into the FIFO in one of two ways; serial or parallel
loading method. The selection of the loading method is done using the LD
(Load) pin. During Master Reset, the state of the LD input determines
whether serial or parallel flag offset programming is enabled. A HIGH on
LD during Master Reset selects serial loading of offset values and in
addition, sets a default PAE offset value of 3FFH (a threshold 1,023 words
from the empty boundary), and a default PAF offset value of 3FFH (a
threshold 1,023 words from the full boundary). A LOW on LD during Master
Reset selects parallel loading of offset values, and in addition, sets a
default PAE offset value of 07FH (a threshold 127 words from the empty
boundary), and a default PAF offset value of 07FH (a threshold 127 words
from the full boundary). See Figure 3, Offset Register Location and Default
Values.
In addition to loading offset values into the FIFO, it also possible to read
the current offset values. It is only possible to read offset values via parallel
read.
Figure 4, Programmable Flag Offset Programming Sequence, summa-
rizes the control pins and sequence for both serial and parallel program-
ming modes. For a more detailed description, see discussion that follows.
The offset registers may be programmed (and reprogrammed) any time
after Master Reset, regardless of whether serial or parallel programming
has been selected.
Number of
Words in
FIFO
0
1 to n (1)
0
1 to n (1)
(n+1) to 8,192
8,193 to (16,384-(m+1))
(16,384-m) (2) to 16,383
16,384
IDT72261LA
IDT72271LA
FF
PAF HF
PAE EF
HH
HL
L
HH
HL
H
HH
H
HH
L
H
HL
L
H
LL
LH
H
4671 drw 05
0
1 to n+1(1)
0
1 to n+1(1)
(n+2) to 16,385
16,386 to (32,769-(m+1))
(32,769-m)
(2)
to 32,768
32,769
IR
PAF HF
PAE OR
LH
H
L
H
LH
H
L
H
HHL
LH
L
H
L
LLL
H
L
HL
L
H
L
IDT72261LA
IDT72271LA
Number of
Words in
FIFO (1)
(n+1) to 16,384
16,385 to (32,768-(m+1))
(32,768-m) (2) to 32,767
32,768
(n+2) to 8,193
8,194 to (16,385-(m+1))
(16,385-m)
(2)
to 16,384
16,385
NOTES:
1. n = Empty Offset, Default Values: n = 127 when parallel offset loading is selected or n = 1,023 when serial offset loading is selected.
2. m = Full Offset, Default Values: m = 127 when parallel offset loading is selected or m = 1,023 when serial offset loading is selected.
TABLE 1 — STATUS FLAGS FOR IDT STANDARD MODE
TABLE 2 — STATUS FLAGS FOR IDT STANDARD MODE
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