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74ALS646-1 Datasheet(PDF) 4 Page - NXP Semiconductors |
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74ALS646-1 Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 13 page Philips Semiconductors Product specification 74ALS646/74ALS646-1 74ALS648/74ALS648-1 Transceiver/register 1991 Feb 08 4 BUS MANAGEMENT FUNCTIONS The following examples demonstrate the four fundamental bus-management functions that can be performed with the 74ALS646/646-1 and 74ALS648/648-1. The select pins determine whether data is stored or transferred through the device in real time. The DIR determines which bus will receive data when the OE pin is Low. REAL TIME BUS TRANSFER BUS B TO BUS A REAL TIME BUS TRANSFER BUS A TO BUS B STORAGE FROM A, B, OR A AND B TRANSFER STORED DATA TO A AND/OR B OE DIR CPAB CPBA SAB SBA LL X X X L BUS A BUS A BUS A BUS A BUS B BUS B BUS B BUS B OE DIR CPAB CPBA SAB SBA LH X X L X OE DIR CPAB CPBA SAB SBA XX ↑ XX X XX X ↑ XX HX ↑↑ XX OE DIR CPAB CPBA SAB SBA L L X H or L X H L H H or L X H X SF00392 |
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