IDT72285 Integrated Device Technology, IDT72285 Datasheet - Page 8

• Manufacturer Part Number: IDT72285
• Description: 64k X 18 Supersync Fifo, 5.0v
• Manufacturer: Integrated Device Technology

current offset values. It is only possible to read offset values via parallel read.
the control pins and sequence for both serial and parallel programming modes.
TABLE 1 — STATUS FLAGS FOR IDT STANDARD MODE
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 2 — STATUS FLAGS FOR FWFT MODE
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.
IDT72275/72285
CMOS SuperSync FIFO™ 32,768 x 18 and 65,536 x 18
In addition to loading offset values into the FIFO, it also possible to read the
Figure 4, Programmable Flag Offset Programming Sequence, summarizes
Number of
Words in
FIFO
Number of
Words in
FIFO
(1)
16,386 to (32,769-(m+1))
16,385 to (32,768-(m+1))
(32,768-m)
(32,769-m) to 32,768
(n + 1) to 16,384
(n + 2) to 16,385
1 to n+ 1
IDT72275
IDT72275
1 to n
32,768
32,769
0
0
(2)
(1)
to 32,767
(1)
(2)
8
For a more detailed description, see discussion that follows.
after Master Reset, regardless of whether serial or parallel programming
has been selected.
The offset registers may be programmed (and reprogrammed) any time
32,770 to (65,537-(m+1))
32,769 to (65,536-(m+1))
(65,536-m)
(65,537-m) to 65,536
(n + 1) to 32,768
(n + 2) to 32,769
1 to n+ 1
IDT72285
IDT72285
1 to n
65,536
65,537
0
0
(2)
(1)
to 65,535
(1)
(2)
COMMERCIAL AND INDUSTRIAL
FF
IR
H
H
H
H
H
H
L
L
L
L
L
L
TEMPERATURE RANGES
PAF
PAF
H
H
H
H
H
H
H
H
L
L
L
L
HF
HF
H
H
H
H
H
H
L
L
L
L
L
L
PAE
PAE
H
H
H
H
H
H
H
H
L
L
L
L
OR
EF
H
L
L
L
L
H
H
L
H
H
H
L