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11 / 54 page Lattice Semiconductor ispMACH 4000ZE Family Data Sheet 11 Figure 9. Power Guard All the I/O pins in a block share a common Power Guard Enable signal. For a block of I/Os, this signal is called a Block Input Enable (BIE) signal. BIE can be internally generated using MC logic, or could come from external sources using one of the user I/O or input pins. Any I/O pin in the block can be programmed to ignore the BIE signal. Thus, the feature can be enabled or disabled on a pin-by-pin basis. Figure 10 shows Power Guard and BIE across multiple I/Os in a block that has eight I/Os. Figure 10. Power Guard and BIE in a Block with 8 I/Os 0 1 E Q D Power Guard Power Guard To Macrocell I/O 0 I/O 1 I/O 7 To GRP 0 1 To Macrocell To GRP To Macrocell To GRP Block Input Enable (BIE) From Block PT. The Block PT is part of the block AND Array, and can be driven by signals from the GRP. Power Guard Power Guard 0 1 0 1 |
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