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PC87309VLJ 数据表(PDF) 18 Page - National Semiconductor (TI) |
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PC87309VLJ 数据表(HTML) 18 Page - National Semiconductor (TI) |
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18 / 192 page  Signal/Pin Connection and Description 18 www.national.com TABLE 1-3. Pins with a Strap Function During Reset 1. These pins have additional multiplexing options in Two-UART mode, controlled by a configuration register. They do not automatically change functions. WDATA 49 FDC Output Group 11 Write Data (FDC) – This output signal holds the write precompensated serial data that is written to the selected floppy disk drive. Precompensation is software selectable. WGATE 53 FDC Output Group 11 Write Gate (FDC) – This output signal enables the write circuitry of the selected disk drive. WGATE is designed to prevent glitches during power up and power down. This prevents writing to the disk when power is cycled. WP 57 FDC Input Group 1 Write Protected – This input signal indicates that the disk in the selected drive is write protected. WRITE 67 Parallel Port Output Group 8 Write Strobe – In EPP mode, this active low signal is a write strobe. This signal is multiplexed with STB. See TABLE 4-12 on page 101 for more information. Signal/Pin Name Pin Number Module I/O and Group # Function TABLE 1-2. Multiplexed Pins in Full-IR and Two-UART Modes Pin Full-IR Mode CFG0 = 0 Two-UART Mode CFG0 = 1 Signal/Pin Name Direction Signal/Pin Name Direction 93 A11 I CTS2 I 94 P12 I/O DCD2 I 95 DRATE0 O DSR2 I 96 IRSL2/ID2 I/O DTR2/BOUT2 O 97 DENSEL I/O RI2 I 98 IRSL1/ID1 I/O RTS2 O 99 ID3 I SIN2 I 100 IRRX2/IRSL0/ID0 I/O SOUT2 O 431 IRRX1 I IRRX1/P12/DRATE0 I/O 441 IRTX O IRTX/DENSEL O 451 MTR0 O MTR0/DRATE0 O 461 MTR1 O MTR1/P12 I/O 481 DR1 O DR1/DENSEL O Function Pin Symbols BADDR0 86 DTR1/BOUT1/BADDR0 BADDR1 88 RTS1/BADDR1 CFG0 92 SOUT1/CFG0 |
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