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PC97307 数据表(PDF) 21 Page - National Semiconductor (TI) |
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PC97307 数据表(HTML) 21 Page - National Semiconductor (TI) |
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21 / 218 page  21 Signal/Pin Connection and Description www.national.com SOUT2,1 148, 138 UART1, UART2 Output Group 17 Serial Output – This output signal sends composite serial data to the communications link (peripheral device, modem or other data transfer device). The SOUT2,1 signals are set active high after a Master Reset (MR). SOUT2 is multiplexed with CFG3. SOUT1 is multiplexed with CFG0. STB 112 Parallel Port I/O Group 13 Data Strobe – This output signal indicates to the printer that valid data is available at the printer port. This signal is in TRI-STATE after a 0 is loaded into the corresponding control register bit. An external 4.7 K Ω pull-up resistor should be employed. This signal is multiplexed wiTH WRITE. STEP 91 FDC Output Group 16 Step – This output signal issues pulses to the disk drive at a software programmable rate to move the head during a seek operation. SWITCH 66 APC Input Group 7 Switch On/Off – Indicates a request to the APC to switch the power on or off. When VDD does not exist, a high to low transition on this signal indicates a Switch On request. When VDD exists, a high to low transition on this pin indicates a Switch Off request. The pin has an internal pull-up of 1 M Ω (nominal), a schmitt-trigger input buffer and debounce protection of at least 16 msec. TC 35 ISA-Bus Input Group 1 DMA Terminal Count – The DMA controller issues TC to indicate the termination of a DMA transfer. TC is accepted only when a DACK signal is active. TC is active high in PC-AT mode, and active low in PS/2 mode. TRK0 96 FDC Input Group 1 Track 0 – This input signal indicates to the controller that the head of the selected floppy disk drive is at track 0. VBAT 64 RTC and APC Input Battery Power Supply – Power signal from the battery to the Real- Time Clock (RTC) or for Advanced Power Control (APC) when VCCH is less than VBAT (by at least 0.5 V). VBAT includes a UL protection resistor. VCCH 65 RTC and APC Input VCC Help Power Supply – This signal provides power to the RTC or APC when VCCH is higher than VBAT (by at least 0.5 V). VDD 1, 24, 61, 100, 121, 140 Power Supply Input Main 5 V Power Supply – This signal is the 5 V supply voltage for the digital circuitry. VSS 2, 11, 25, 40, 60, 101, 120, 130, 139 Power Supply Output Ground – This signal provides the ground for the digital circuitry. WAIT 111 Parallel Port Input Group 2 Wait – In EPP mode, the parallel port device uses this signal to extend its access cycle. WAIT is active low. It is internally connected to a nominal 25 K Ω pull-down resistor. This signal is multiplexed with BUSY. See Table 6-12 on page 134 for more information. WDATA 89 FDC Output Group 16 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. WDO 156 Power Management Output Group 10 WATCHDOG Out – This output pin becomes low when a WATCHDOG time-out occurs. See “The WATCHDOG Feature” on page 172. This pin is configured by bit 6 of the SuperI/O Configuration Register 2. This signal is multiplexed with GPIO17. Signal/Pin Name Pin Number Module I/O and Group # Function |
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