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CS5535 датащи(PDF) 321 Page - National Semiconductor (TI) |
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CS5535 датащи(HTML) 321 Page - National Semiconductor (TI) |
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321 / 555 page ![]() Revision 0.8 321 www.national.com Floppy Port Register Descriptions (Continued) 5.7.1 Floppy Port Specific MSRs 5.7.1.1 Floppy Port 3F2h Shadow (FLPY_3F2_SHDW) 5.7.1.2 Floppy Port 3F7h Shadow (FLPY_3F7_SHDW) MSR Address 51400030h Type RO Reset Value xxh FLPY_3F2_SHDW Register Map 76543 210 FLPY_PORT_3F2_VAL FLPY_3F2_SHDW Bit Descriptions Bit Name Description 7:0 FLPY_PORT_3F2 _VAL Floppy Port Shadow Register Value Last Written to I/O Port 3F2h. Required for support of FDC power ON/OFF and Zero Volt Suspend/Resume coherency. This register is a copy of an I/O register that cannot safely be directly read. Value in reg- ister is not deterministic of when the register is being read. It is provided here to assist in a Save-to-Disk operation. MSR Address 51400031h Type RO Reset Value xxh FLPY_3F7_SHDW Register Map 76543 210 FLPY_PORT_3F7_VAL FLPY_3F7_SHDW Bit Descriptions Bit Name Description 7:0 FLPY_PORT_3F7 _VAL Floppy Port Shadow Register Value Last Written to I/O Port 3F7h. Required for support of FDC power ON/OFF and Zero Volt Suspend/Resume coherency. This register is a copy of an I/O register that cannot safely be directly read. Value in reg- ister is not deterministic of when the register is being read. It is provided here to assist in a Save-to-Disk operation. |
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