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PC87427 Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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PC87427 Datasheet(HTML) 3 Page - National Semiconductor (TI) |
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3 / 46 page  Revision 1.0 3 www.national.com Features (Continued) — 16-byte FIFO — Error-free handling of data overrun and underrun — Software compatible with the PC8477, which contains a superset of the FDC functions in the µDP8473, NEC µPD765A/B and N82077 — High-performance digital separator — Supports standard 5.25" and 3.5" FDDs — Supports one FDD — Supports fast tape drives (2 Mbps) and standard tape drives (1 Mbps, 500 Kbps and 250 Kbps) s Keyboard and Mouse Controller (KBC) — 8-bit microcontroller, software compatible with 8042AH and PC87911 — Standard interface (60h, 64h, IRQ1 and IRQ12) — Supports two external swapable PS/2 interfaces for keyboard and mouse — Five programmable, dedicated, quasi-bidirectional I/O lines (Fast GA20/P21, KBRST/P20, P12, P16, P17) General-Purpose I/O Module s 52 General-Purpose I/O (GPIO) Ports — Individually assigned to either LPC or SMBus con- trol — 45 ports individually configured as input or output — 7 output ports — Programmable features for each output pin: ❏ Drive type (open-drain, push-pull or TRI-STATE) ❏ TRI-STATE on VDD-fall detection for pins driving VDD-supplied devices — Programmable option for internal pull-up resistor on each input pin — Lock option for the configuration and data of each output pin — 16 GPIO ports generate IRQ/SIOSMI/SIOSCI for wake-up events, with individual: ❏ Enable control ❏ Polarity and edge/level selection ❏ Debounce mechanism — VSB powered — Low-cost external GPIO port extension via a serial bus — I/O ports transactions routing to the GPIO port ex- tension s Real-Time Clock — DS1287, MC146818 and PC87911 compatible — Battery-backed 242-byte CMOS RAM, in two banks (accessed through 70-71h and 72-73h) — Selective lock mechanisms for the RTC RAM — Y2K-compliant calendar, including century and automatic leap-year adjustment — Time of day in seconds, minutes and hours, which allows a 12-hour or 24-hour format with optional adjustment for daylight saving time — Separated SMBus access to RTC RAM and RTC Control D register — Battery level measurement Power Management s Supports ACPI Specification Revision 2.0b, July 27, 2000 s System Wake-Up Control (SWC) — Wake-up request on detection of: ❏ Preprogrammed Keyboard or Mouse sequence ❏ External modem ring from RI1 or RI2 on serial ports ❏ Predetermined RTC date and time alarm ❏ General-Purpose Input Events from up to 16 GPIO pins ❏ IRQs of internal logical devices — Optional routing of power-up request to SERIRQ, SIOSMI, SIOSCI, PWBTOUT and ONCTL — Routing control per input/output event combination — Outputs enable/disable per event and system state combination (ACPI Sx states) — Implements bank “b” of the ACPI registers — Suspend modes via software emulation (control) — Battery-backed event-logic configuration — Power Button support, featuring: ❏ On/Off control ❏ Power-off, 4-second override ❏ Power Button output — Sleep Button support s Power Supply On/Off control — Supports Legacy- and ACPI-compatible Power Button — Direct power supply control in response to wake-up events — Programmable Crowbar time-out for “On” request — On/Off control via software emulation — Power-fail recovery s Enhanced Power Management (PM), including: — Special configuration registers for power down — Reduced current leakage from pins — Low-power CMOS technology — Capability for disabling all modules s Keyboard Events — Wake-up on any key — Supports programmable 8-byte sequence “pass- word” for Power Management — Simultaneous recognition of three programmable keys (sequences): “Power”, “Sleep” and “Resume” s Power Active Timers — Two power-on, elapsed-time counters for the main (VDD) and standby (VSB) power supplies — 32-bit counters, clocked by a 1-second clock — VBAT backed-up counters |
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Similar Description - PC87427 |
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