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參數(shù)資料
| 型號： | 376 |
| 廠商： | Intel Corp. |
| 英文描述： | DIODE SCHOTTKY DUAL-DUAL SERIES 30V 200mW 0.38V-vf 200mA-IFM 1mA-IF 0.2uA-IR SOT-363 3K/REEL |
| 中文描述： | 376TM，高性能32位嵌入式處理器 |
| 文件頁數(shù)： | 54/95頁 |
| 文件大?。?/td> | 1293K |
| 代理商： | 376 |
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376 EMBEDDED PROCESSOR
240182–31
NOTE:
For maximum design flexibility the 80376 has no internal pull-up resistors on its outputs. Your design may require an
external pullup on ADS and other 80376 outputs to keep them negated during float periods.
Figure 4.16. Requesting Hold from Idle Bus
RESET DURING HOLD ACKNOWLEDGE
RESET being asserted takes priority over HOLD be-
ing asserted. If RESET is asserted while HOLD re-
mains asserted, the 80376 drives its pins to defined
states during reset, as in
Table 4.5, Pin State Dur-
ing Reset,
and performs internal reset activity as
usual.
If HOLD remains asserted when RESET is inactive,
the 80376 enters the hold acknowledge state before
performing its first bus cycle, provided HOLD is still
asserted when the 80376 processor would other-
wise perform its first bus cycle. If HOLD remains as-
serted when RESET is inactive, the BUSY input is
still sampled as usual to determine whether a self
test is being requested.
FLOAT
Activating the FLT input floats all 80376 bidirectional
and output signals, including HLDA. Asserting FLT
isolates the 80376 from the surrounding circuitry.
When an 80376 in a PQFP surface-mount package
is used without a socket, it cannot be removed from
the printed circuit board. The FLT input allows the
80376 to be electrically isolated to allow testing of
external circuitry. This technique is known as ONCE
for ‘‘ON-Circuit Emulation’’.
ENTERING AND EXITING FLOAT
FLT is an asynchronous, active-low input. It is recog-
nized on the rising edge of CLK2. When recognized,
it aborts the current bus cycle and floats the outputs
of the 80376 (Figure 4.20). FLT must be held low for
a minimum of 16 CLK2 cycles. Reset should be as-
serted and held asserted until after FLT is deassert-
ed. This will ensure that the 80376 will exit float in a
valid state.
Asserting the FLT input unconditionally aborts the
current bus cycle and forces the 80376 into the
FLOAT mode. Since activating FLT unconditionally
forces the 80376 into FLOAT mode, the 80376 is not
54
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 376 | 制造商:Pro-Signal 功能描述:; Supply Voltage:28VDC; Lamp Base Type:M |
| 37-6.8 | 制造商:Distributed By MCM 功能描述:Resistor 1/2W 6.8 Ohm Flameproof, Bag of 20 制造商:MCM 功能描述:1/2 Watt Flameproof Resistors, Resistance: 6.8 Ohm, Tolerance: 5 %, Quantity: 20 per bag |
| 37-6.8K | 制造商:Distributed By MCM 功能描述:Resistor 1/2W 6.8K Ohm Flameproof, Bag of 20 制造商:MCM 功能描述:RESISTOR 1/2W 6.8K OHM FLAMPRF20 PER BAG |
| 376/377-1ZM | 制造商:Rayovac 功能描述:SILVER ELECTRONIC BTRY 1PK MERCURY FREE |
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