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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PC97338VLJ датащи(PDF) 103 Page - National Semiconductor (TI) |
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PC97338VLJ датащи(HTML) 103 Page - National Semiconductor (TI) |
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103 / 221 page  103 www.national.com Bits 7,6 - Density Select Pin Configuration (DENSEL) This field can configure the polarity of the Density Select output signal (DENSEL) as always low or always high, as shown in Table 4-3. This allows the user more flexibility with new drive types. This field overrides the DENSEL polarity defined by the DENSEL polarity bit of the Advanced Su- perI/O Chip (ASC) configuration register de- scribed on page 53. 00 - The DENSEL signal is always low. 01 - The DENSEL signal is always high. 10 - The DENSEL signal is undefined. 11 - The polarity of the DENSEL signal is defined by the DENSEL Polarity bit (bit 6) of the ASC register. See page 53. (Default) TABLE 48. DENSEL Encoding Execution Phase Internal registers are written. Result Phase None. 3.6.8 The NSC Command The NSC command can be used to distinguish be- tween the FDC versions and the 82077. Command Phase Execution Phase Result Phase The result phase byte of the NSC command identifies the floppy disk controller (FDC) as a PC87338/PC97338 by returning a value of 73h. The 82077 and DP8473 return the value 80 hex, sig- nifying an invalid command. Bits 3-0 of this result byte are subject to change by NSC, and specify the version of the Floppy Disk Con- troller (FDC). Bit 7 Bit 6 DENSEL Pin Definition 0 0 DENSEL low 0 1 DENSEL high 1 0 undefined 1 1 Set by ASC register. 7654 3210 0001 1000 7654 3210 0111 0011 |
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