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參數資料
| 型號： | W83877TF |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 外設及接口 |
| 英文描述： | Multi-Function I/O Port Controller(用于個人計算機的多功能輸入/輸出口控制器) |
| 中文描述： | MULTIFUNCTION PERIPHERAL, PQFP100 |
| 封裝： | QFP-100 |
| 文件頁數： | 59/154頁 |
| 文件大小： | 821K |
| 代理商： | W83877TF |
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W83877TF
Publication Release Date: March 1998
- 55 -
Version 0.61
A watchdog timer is required to prevent system lockup. The timer indicates that more than 10
μ
S
have elapsed from the start
of the EPP
cycle to the time
WAIT
is de-asserted. The current EPP cycle
is aborted when a time-out occurs. The time-out condition is indicated in Status bit 0.
EPP Operation
The EPP operates on a two-phase cycle. First, the host selects the register within the device for
subsequent operations. Second, the host performs a series of read and/or write byte operations to the
selected register. Four operations are supported on the EPP: Address Write, Data Write, Address
Read, and Data Read. All operations on the EPP device are performed synchronously.
EPP Version 1.9 Operation
The EPP read/write operation can be completed under the following conditions:
a. If the nWait is active low, when the read cycle (nWrite inactive high, nDStrb/nAStrb active low) or
write cycle (nWrite active low, nDStrb/nAStrb active low) starts, the read/write cycle proceeds
normally and will be completed when nWait goes inactive high.
b. If nWait is inactive high, the read/write cycle will not start. It must wait until nWait changes to
active low, at which time it will start as described above.
EPP Version 1.7 Operation
The EPP read/write cycle can start without checking whether nWait is active or inactive. Once the
read/write cycle starts, however, it will not terminate until nWait changes from active low to inactive
high.
4.3 Extended Capabilities Parallel (ECP) Port
This
port is software and hardware compatible with existing parallel ports, so it may be used as a
standard printer mode if ECP is not required. It provides an automatic high burst-bandwidth channel
that supports DMA for ECP in both the forward (host to peripheral) and reverse (peripheral to host)
directions.
Small FIFOs are used in both forward and reverse directions to improve the maximum bandwidth
requirement. The size of the FIFO is 16 bytes. The ECP port supports an automatic handshake for
the standard parallel port to improve compatibility mode transfer speed.
The ECP port supports run-length-encoded (RLE) decompression (required) in the hardware.
Compression is accomplished by counting identical bytes and transmitting an RLE byte that indicates
how many times the next byte is to be repeated. The hardware support for compression is optional.
For more information about the ECP Protocol, refer to the Extended Capabilities Port Protocol and
ISA Interface Standard.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| W83877TG | 功能描述:IC I/O CONTROLLER 100-PQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 標準包裝:3,000 系列:- 應用:PDA，便攜式音頻/視頻，智能電話 接口:I²C，2 線串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤 供應商設備封裝:24-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) 安裝類型:表面貼裝 產品目錄頁面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2 |
| W83910F | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IPMI BMC plus H/W Monitor. UART. 5-sets Master/Slave SMBus. for Server PC Application |
| W83960G (REV. B) | 制造商:Nuvoton Technology Corp 功能描述:IC H/W MONITOR 64LQFP |
| W83971D | 制造商:WINBOND 制造商全稱:Winbond 功能描述:AC97 AUDIO CODEC |
| W83977A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O |
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