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PD6710 Datasheet(PDF) 95 Page - Intel Corporation |
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PD6710 Datasheet(HTML) 95 Page - Intel Corporation |
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95 / 138 page  ISA-to-PC-Card (PCMCIA) Controllers — PD6710/’22 Datasheet 95 14.0 VS1# and VS2# Voltage Detection The PD6722 provides support for VS1# and VS2# voltage sense for environments where special low-voltage keyed PC Card sockets are to be used. With a low-voltage keyed socket, it is necessary to determine the operating voltage range of a card before applying power to it. The PD6722 supports reading of the levels on a socket’s VS1# and VS2# pins through a uniform extended register programming model using Socket B extended register 0Ah. The programming model is as follows: For voltage detection on the PD6710, refer to the 5V_DET pin. On the PD6722, the B_GPSTB pin is programmed as a general-purpose read strobe. The VS1# and VS2# pins from the A and B sockets are connected to the external half of a ’244 buffer as follows (which allows Socket A VS1 and VS2 to appear as bits 0 and 1, and Socket B VS1 and VS2 to appear as bits 2 and 3): Register Name: External Data Index: 6Fh Extended Index: 0Ah Register Per: socket Register Compatibility Type: ext. Bit 7 Bit 6Bit 5Bit 4Bit 3Bit 2Bit 1Bit 0 External Data 7 External Data 6 External Data 5 External Data 4 B_VS2 Input B_VS1 Input A_VS2 Input A_VS1 Input RW:0 RW:0 RW:0 RW:0 R:0 R:0 R:0 R:0 |
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