enhanced version from Winbonds most popular I/O chip W83877F

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The W83877ATF is an enhanced version from Winbond's most popular I/O chip W83877F --- which integrates the disk drive adapter, serial port (UART), IrDA 1.0 SIR, parallel port, configurable plugand- play registers for the whole chip --- plus additional powerful features: IrDA 1.1 (MIR for 1.152M bps or FIR for 4M bps), TV remote IR, ACPI, serial IRQ, full 16-bit address decoding, and ACPI compliant.

The disk drive adapter functions of W83877ATF include a floppy disk drive controller compatible with the industry standard 82077/765, data separator, write pre-compensation circuit, decode logic, data rate selection, clock generator, drive interface control logic, and interrupt and DMA logic. The wide range of functions integrated onto the W83877ATF greatly reduces the number of components required for interfacing with floppy disk drives. The W83877ATF supports four 360K, 720K, 1.2M, 1.44M, or 2.88M disk drives and data transfer rates of 250 Kb/S, 300 Kb/S, 500 Kb/S,1 Mb/S, and 2 Mb/S.

The W83877ATF provides two high-speed serial communication ports (UARTs), one of which supports serial Infrared communication. Each UART includes a 16-byte send/receive FIFO, a programmable baud rate generator, complete modem control capability, and a processor interrupt system. One of the UARTs supporting infrared (IR) includes 32-byte FIFO, serial IR, 1.152M bps MIR, 0.576M bps, 4M bps FIR, and TV remote IR (supporting NEC, RC-5, extended RC-5, and RECS-80 protocols). Both UARTs provide legacy speed with baud rate 115.2k, and provide advanced speed with baud rate 230k, 460k, and 921k bps which support higher speed Modems.

The W83877ATF supports one PC-compatible printer port (SPP), Bi-directional Printer port (BPP) and also Enhanced Parallel Port (EPP) and Extended Capabilities Port (ECP). Through the printer port interface pins, also available are: Extension FDD Mode and Extension 2FDD Mode allowing one or two external floppy disk drives to be connected to the notebook computer.

Winbond W83877ATF provides functions that comply with ACPI (Advanced Configuration and Power Interface), which includes support of legacy and ACPI power management through SMI or SCI function pins. One 24-bit power management timer is implemented with carry notify interrupt. W83877ATF also has auto power management to reduce power consumption.

The Serial IRQ for PCI architecture is supported, ISA IRQs (IRQ1~IRQ15) can be cascaded into one IRQ pin. W83877ATF also features ISA bus IRQ sharing and allows two or more devices to share the same IRQ.
W83877ATF is made to fully comply with MicrosoftTM PC97 Hardware Design Guide. IRQs, DMAs, and I/O space resource are flexible to adjust to meet ISA PnP requirements. Moreover, W83877ATF is made to meet the specification of PC97's requirement in the power management: ACPI and DPM (Device Power Management).

The configuration registers support mode selection, function enable/disable, and power down function selection. Furthermore, the configurable PnP features are compatible with the plug-and-play feature demand of Windows 95TM, which makes system resource allocation more efficient than ever. Another benifit is that W83877ATF has the same pin assignment as W83877F, W83877AF, 
W83877TF. Thius makes the design very flexible.

Power Supply Voltage
-0.3 to 7.0
Input Voltage
-0.5 to VDD+0.5
Operating Temperature
0 to + 70
Storage Temperature
-55 to + 150
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the device.
· Plug & Play 1.0A Compliant
· Support 8 IRQs (ISA), or 15 IRQs (Serial IRQ), 4 DMA channels, and 480 Relocatable addresses
· Capable of ISA Bus IRQ Sharing
· Compliant with Microsoft TM PC97 Hardware Design Guide
· Support DPM (Device Power Management), ACPI
· Report ACPI status interrupt by nSCI signal from serial IRQ pin, or from IRQ A~H pins
· Single 24M or 48M Hz crystal input
· Compatible with IBMTM PC AT disk drive systems
· Variable write pre-compensation with track selectable capability
· DMA enable logic
· Support floppy disk drives and tape drives
· Detects all overrun and underrun conditions
· Built-in address mark detection circuit to simplify the read electronics
· FDD anti-virus functions with software write protect and FDD write enable signal (write data signal is forced to be inactive)
· Support up to four 3.5-inch or 5.25-inch floppy disk drives
· Completely compatible with industry standard 82077
· 360K/720K/1.2M/1.44M/2.88M format; 250K, 300K, 500K, 1M, 2M bps data transfer rate
· Support vertical recording format
• Support 3-mode FDD, and its Windows95TM driver
· 16-byte data FIFOs
· Two high-speed 16550 compatible UARTs with 16-byte send/receive FIFOs
· MIDI compatible
· Fully programmable serial-interface characteristics:
- 5, 6, 7 or 8-bit characters
- Even, odd or no parity bit generation/detection
- 1, 1.5 or 2 stop bits generation

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Size: 1200.04KB
Page: 47
PDF: W83877ATF.pdf
  • Description:
    enhanced version from Winbonds most popular I/O chip W83877F
  • MFG:
    WINBOND [Winbond]



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