參數(shù)資料
型號: 37C669
廠商: SMSC Corporation
英文描述: DIODE SCHOTTKY SINGLE 25V 200mW 0.5V-vf 200mA-IFM 30mA-IF 2uA-IR SOD-323 3K/REEL
中文描述: 電腦98/99順從超級I / O軟盤控制器與紅外線支持
文件頁數(shù): 159/164頁
文件大?。?/td> 621K
代理商: 37C669
94
Data or Address cycle.
IOCHRDY is driven
active low when nWAIT is active low during the
EPP cycle. This can be used to extend the cycle
time.
The write cycle can complete when
nWAIT is inactive high.
Write Sequence of Operation
1.
The host sets PDIR bit in the control
register to a logic "0".
This asserts
nWRITE.
2.
The host selects an EPP register, places
data on the SData bus and drives nIOW
active.
3.
The chip places address or data on PData
bus.
4.
Chip asserts nDATASTB or nADDRSTRB
indicating that PData bus contains valid
information, and the WRITE signal is valid.
5.
If nWAIT
is
asserted,
IOCHRDY
is
deasserted until the peripheral deasserts
nWAIT or a time-out occurs.
6.
When the host deasserts nI0W
the
chip
deasserts nDATASTB or nADDRSTRB and
latches the data from the SData bus for the
PData bus.
7.
Chip may modify nWRITE, PDIR and
nPDATA in preparation of the next cycle.
EPP 1.7 Read
The timing for a read operation (data) is shown
in timing diagram EPP 1.7 Read Data cycle.
IOCHRDY is driven active low when nWAIT is
active low during the EPP cycle. This can be
used to extend the cycle time. The read cycle
can complete when nWAIT is inactive high.
Read Sequence of Operation
1.
The host sets PDIR bit in the control
register to a logic "1".
This deasserts
nWRITE and tri-states the PData bus.
2.
The host selects an EPP register and drives
nIOR active.
3.
Chip asserts nDATASTB or nADDRSTRB
indicating that PData bus is tri-stated, PDIR
is set and the nWRITE signal is valid.
4.
If nWAIT
is
asserted,
IOCHRDY
is
deasserted until the peripheral deasserts
nWAIT or a time-out occurs.
5.
The Peripheral drives PData bus valid.
6.
The
Peripheral
deasserts
nWAIT,
indicating that PData is valid and the chip
may begin the termination phase of the
cycle.
7.
When the host deasserts nI0R
the
chip
deasserts nDATASTB or nADDRSTRB.
8.
Peripheral tri-states the PData bus.
9.
Chip
may modify nWRITE,
PDIR
and
nPDATA in preparation of the next cycle.
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