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參數(shù)資料
型號(hào): W83877ATF
廠商: WINBOND ELECTRONICS CORP
元件分類(lèi): 外設(shè)及接口
英文描述: enhanced version from Winbonds most popular I/O chip W83877F
中文描述: MULTIFUNCTION PERIPHERAL, PQFP100
封裝: QFP-100
文件頁(yè)數(shù): 92/191頁(yè)
文件大小: 1200K
代理商: W83877ATF
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W83877ATF
Publication Release Date: April 1998
- 88 -
Version 0.51
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 asynchronously.
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 in 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(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
W83877F 制造商:WINBOND 制造商全稱(chēng):Winbond 功能描述:WINBOND I/O
W83877TD 制造商:WINBOND 制造商全稱(chēng):Winbond 功能描述:WINBOND I/O
W83877TF 制造商:WINBOND 制造商全稱(chēng):Winbond 功能描述:WINBOND I/O
W83877TG 功能描述:IC I/O CONTROLLER 100-PQFP RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 專(zhuān)用 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 應(yīng)用:PDA,便攜式音頻/視頻,智能電話(huà) 接口:I²C,2 線(xiàn)串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-QFN 裸露焊盤(pán)(4x4) 包裝:帶卷 (TR) 安裝類(lèi)型:表面貼裝 產(chǎn)品目錄頁(yè)面:1015 (CN2011-ZH PDF) 其它名稱(chēng):296-25223-2
W83910F 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:IPMI BMC plus H/W Monitor. UART. 5-sets Master/Slave SMBus. for Server PC Application