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參數資料
| 型號： | W83697F |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | WINBOND I/O |
| 中文描述： | 華邦的I / O |
| 文件頁數： | 77/167頁 |
| 文件大小： | 1094K |
| 代理商： | W83697F |
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W83697HF/F
Publication Release Date: Feb. 2002
Revision 0.70
- 68 -
6.2.7 EPP Pin Descriptions
EPP NAME
nWrite
PD<0:7>
Intr
nWait
TYPE
O
I/O
I
I
EPP DESCRIPTION
Denotes an address or data read or write operation.
Bi-directional EPP address and data bus.
Used by peripheral device to interrupt the host.
Inactive to acknowledge that data transfer is completed. Active to indicate
that the device is ready for the next transfer.
Paper end; same as SPP mode.
Printer selected status; same as SPP mode.
This signal is active low. It denotes a data read or write operation.
Error; same as SPP mode.
This signal is active low. When it is active, the EPP device is reset to its
initial operating mode.
This signal is active low. It denotes an address read or write operation.
PE
Select
nDStrb
nError
nInits
I
I
O
I
O
nAStrb
O
6.2.8 EPP Operation
When the EPP mode is selected in the configuration register, the standard and bi-directional modes are
also available. The PDx bus is in the standard or bi-directional mode when no EPP read, write, or
address cycle is currently being executed. In this condition all output signals are set by the SPP Control
Port and the direction is controlled by DIR of the Control Port.
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 deasserted. The current EPP cycle is
aborted when a time-out occurs. The time-out condition is indicated in Status bit 0.
6.2.8.1 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.
6.2.8.2 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.
6.2.8.3 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.
相關PDF資料 |
PDF描述 |
|---|---|
| W83697SF | WINBOND I/O |
| W83757 | SUPER I/O CHIP |
| W83759 | ADVANCED VL-IDE DISK CONTROLLER |
| W83759A | ADVANCED VL-IDE DISK CONTROLLER |
| W83768 | I/O COUPLER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W83697HF | 制造商:WINBOND 制造商全稱:Winbond 功能描述:LPC I/O |
| W83697HF_05 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:LPC I/O |
| W83697HG | 功能描述:IC LPC SUPER I/O 128-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 |
| W83697SF | 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O |
| W83697UF | 制造商:WINBOND 制造商全稱:Winbond 功能描述:LPC I/O |
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