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UT54ACTS220 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - Clock and Waut State Generation Circuit - Aeroflex Microelectronic Solutions

भाग संख्या UT54ACTS220
समारोह Clock and Waut State Generation Circuit
मैन्युफैक्चरर्स Aeroflex Microelectronic Solutions 
लोगो Aeroflex Microelectronic Solutions लोगो 
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UT54ACTS220 pdf
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UT54ACTS220
PIN DESCRIPTION
Pin Number Pin Name
2 CLKOUT
3 CLKOUT
4 CLKIN
6 48MHz
8 DMACK
9 RCS
10 MRST
11 TEST
12 DTACK
13 24MHz
Description
Buffered version of CLKIN.
Inverted version of CLKIN.
Clock Input. This signal can be any arbitrary signal that the user wishes to buffer.
48MHz Clock. The 24MHz clock is created by dividing this signal by two.
DMA Acknowledge. This input is generated by the SµMMIT. When high, this signal
will cause DTACK output to be forced high.
RAM Chip Select. This input is generated by the SµMMIT.
Master Reset. This input can be used to preset 24MHz, DTACK and TEST. For normal
operation tie MRST to VDD through a resistor.
Test output signal.
Data Transfer Acknowledge. This signal can be used to drive the DTACK signal of the
SµMMIT if the user requires one wait state during the memory transfer.
24MHz Clock. This output runs at half the frequency of the 48MHz input. The falling
edge of 24MHz is the signal that latches the DTACK outputs. 24MHz is forced high
whenever MRST is low. Properly loaded, 24MHz will have a 50% duty cycle ± 5%.
FUNCTIONAL TIMING: Single SµMMIT Wait-State
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For both read and write memory cycles, DTACK is an input to the SµMMIT E and SµMMIT LXE/DXE. A non-wait state mem-
ory requires two clock cycles, T1 and T2 of figure 1. For accessing slower memory devices, the UT54ACTS220 holds DTACK to
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a logical “1”. This results in the stretching of memory cycles by one clock to three clock cycles, TW of figure 1. The SµMMIT E
and SµMMIT LXE/DXE samples the DTACK on the rDisaintagSedhgeeeto4fUth.ceo2m4 MHz clock. If DTACK is not generated before the ris-
ing edge of the clock, the SµMMIT E and SµMMIT LXE/DXE extends the memory cycle.
48MHz
24MHz
DMACK
RCS
DTACK
T1 TW
T2
Figure 1. Functional Timing
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अनुशंसा डेटापत्रक

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