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72265LA10PFGI8 Datasheet(PDF) 8 Page - Integrated Device Technology |
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72265LA10PFGI8 Datasheet(HTML) 8 Page - Integrated Device Technology |
8 / 27 page 8 IDT72255LA/72265LA CMOS SuperSync FIFO™ 8,192 x 18 and 16,384 x 18 COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES PROGRAMMING FLAG OFFSETS Full and Empty Flag offset values are user programmable. The IDT72255LA/72265LA has internal registers for these offsets. Default set- tings 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 IDT72255LA IDT72265LA FF PAF HF PAE EF 00 H H H L L 1 to n (1) 1 to n (1) HH H L H (n + 1) to 4,096 (n + 1) to 8,192 H H H H H 4,097 to (8,192–(m+1)) 8,193 to (16,384–(m+1)) HH L H H (8,192–m)(2) to 8,191 (16,384–m) (2) to 16,383 H L L H H 8,192 16,384 L L L H H 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 Number of Words in FIFO IDT72255LA IDT72265LA FF PAF HF PAE EF 00 L H H L H 1 to n+1 (1) 1 to n+1 (1) LH H L L (n + 2) to 4,097 (n + 2) to 8,193 L H H H L 4,098 to (8,193–(m+1))(2) 8,194 to (16,385–(m+1)) (2) LH L H L (8,193–m) to 8,192 (16,385–m) (2) to 16,384 L L L H L 8,193 16,385 H L L H L 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 Number of Words in FIFO (1) 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. |
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