DT72T1845 Datasheet, PDF (18/56 Pages) Integrated Device Technology – 2.5 VOLT HIGH-SPEED TeraSync™ FIFO

IDT72T1845/55/65/75/85/95/105/115/125 2.5V TeraSync™ 18-BIT/9-BIT FIFO 2Kx18/4Kx9, 4Kx18/
8Kx9, 8Kx18/16Kx9, 16Kx18/32Kx9, 32Kx18/64Kx9, 64Kx18/128Kx9, 128Kx18/256Kx9, 256Kx18/512Kx9, 512Kx18/1Mx9
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
TABLE 3 ⎯ STATUS FLAGS FOR IDT STANDARD MODE
IW = OW = x9
IW = x18 or
OW = x18
Number of
Words in
FIFO
IDT72T1845
0
1 to n ⁽¹⁾
(n+1) to 1,024
1,025 to (2048-(m+1))
(2048-m) to 2,047
2,048
IDT72T1845
IDT72T1855
0
1 to n ⁽¹⁾
(n+1) to 2,048
2,049 to (4,096-(m+1))
(4,096-m) to 4,095
4,096
IDT72T1855
IDT72T1865
0
1 to n ⁽¹⁾
(n+1) to 4,096
4,097 to (8,192-(m+1))
(8,192-m) _{to 8,191}
8,192
IDT72T1865
IDT72T1875
0
1 to n ⁽¹⁾
(n+1) to 8,192
8,193 to (16,384-(m+1))
(16,384-m) to 16,383
16,384
IDT72T1875
IDT72T1885
0
1 to n ⁽¹⁾
(n+1) to 16,384
16,385 to (32,768-(m+1))
(32,768-m) to 32,767
32,768
FF PAF HF PAE EF
H HHL L
H HHL H
HHHHH
H HL H H
HL L HH
LL L HH
IW = OW = x9
IDT72T1885
IDT72T1895
IDT72T18105
IDT72T18115
IDT72T18125
IW = x18 or
OW = x18
IDT72T1895
IDT72T18105
IDT72T18115
IDT72T18125
FF PAF HF PAE EF
0
0
0
0
0
HHHL L
Number of
1 to n ⁽¹⁾
1 to n ⁽¹⁾
1 to n ⁽¹⁾
1 to n ⁽¹⁾
1 to n ⁽¹⁾
HHHL H
Words in
FIFO
(n+1) to 32,768
(n+1) to 65,536
(n+1) to 131,072
(n+1) to 262,144
(n+1) to 524,288
HHHHH
32,769 to (65,536-(m+1)) 65,537 to (131,072-(m+1)) 131,073 to (262,144-(m+1)) 262,145 to (524,288-(m+1)) 524,289 to (1,048,576-(m+1)) H H L H H
(65,536-m) to 65,535 (131,072-m) to 131,071 (262,144-m) to 262,143 (524,288-m) to 524,287 (1,048,576-m) to 1,048,575 H L L H H
65,536
131,072
262,144
524,288
1,048,576
L L LHH
NOTE:
1. See table 2 for values for n, m.
TABLE 4 ⎯ STATUS FLAGS FOR FWFT MODE
IW = OW = x9
IW = x18 or
OW = x18
Number of
Words in
FIFO
IDT72T1845
0
1 to n+1 ⁽¹⁾
(n+2) to 1,025
1,026 to (2049-(m+1))
(2049-m) _{to 2,048}
2,049
IDT72T1845
IDT72T1855
0
1 to n+1 ⁽¹⁾
(n+2) to 2,049
2,050 to (4,097-(m+1))
(4,097-m) to 4,096
4,097
IDT72T1855
IDT72T1865
0
1 to n+1 ⁽¹⁾
(n+2) to 4,097
4,098 to (8,193-(m+1))
(8,193-m) _{to 8,192}
8,193
IDT72T1865
IDT72T1875
0
1 to n+1 ⁽¹⁾
(n+2) to 8,193
8,194 to (16,385-(m+1))
(16,385-m) to 16,384
16,385
IDT72T1875
IDT72T1885
0
1 to n+1 ⁽¹⁾
(n+2) to 16,385
16,386 to (32,769-(m+1))
(32,769-m) to 32,768
32,769
IR PAF HF PAE OR
L HHL H
L HHL L
L HHHL
LHLHL
L L LHL
HL LHL
IW = OW = x9
IDT72T1885
IDT72T1895
IDT72T18105
IDT72T18115
IDT72T18125
IW = x18 or
OW = x18
IDT72T1895
IDT72T18105
IDT72T18115
IDT72T18125
IR PAF HF PAE OR
Number of
Words in
FIFO
0
0
0
0
0
L
1 to n+1 ⁽¹⁾
1 to n+1 ⁽¹⁾
1 to n+1 ⁽¹⁾
1 to n+1 ⁽¹⁾
1 to n+1 ⁽¹⁾
L
(n+2) to 32,769
(n+2) to 65,537
(n+2) to 131,073
(n+2) to 262,145
(n+2) to 524,289
L
32,770 to (65,537-(m+1)) 65,538 to (131,073-(m+1)) 131,074 to (262,145-(m+1)) 262,146 to (524,289-(m+1)) 524,290 to (1,048,577-(m+1)) L
HHL H
HHL L
HHHL
HLHL
(65,537-m) to 65,536 (131,073-m) to 131,072 (262,145-m) to 262,144 (524,289-m) to 524,288 (1,048,577-m) to 1,048,576 L L L H L
65,537
131,073
262,145
524,289
1,048,577
H L LHL
NOTE:
1. See table 2 for values for n, m.
2. Number of Words in FIFO = Depth + Output Register.
5909 drw05
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