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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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USB2228 Scheda tecnica(PDF) 18 Page - SMSC Corporation |
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USB2228 Scheda tecnica(HTML) 18 Page - SMSC Corporation |
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18 / 26 page  4th Generation USB2.0 Flash Media Controller with Integrated Card Power FETs Datasheet Revision 1.77 (06-13-05) 18 SMSC USB2227/USB2228 DATASHEET Memory Address Bus MA[1:0]/CLK_S EL[1:0] I/O8PD MA[1:0], These signals address memory locations within the external memory. SEL[1:0]. During nRESET assertion, these pins will select the operating frequency of the external clock, and the corresponding weak pull-down resistors are enabled. When nRESET is negated, the value on these pins will be internal latched and these pins will revert to MA[1:0] functionality, the internal pull-downs will be disabled. SEL[1:0] = ‘00’. 24MHz SEL[1:0] = ‘01’. RESERVED SEL[1:0] = ‘10’. RESERVED SEL[1:0] = ‘11’. 48MHz Note: If the latched value is ‘1’, then the corresponding MA pin is tri-stated when the following conditions are true: 1. IDLE bit (PCON.0) is 1. 2. INT2 is negated 3. SLEEP bit of CLOCK_SEL is 1. If the latched value is ‘0’, then the corresponding MA pin will function identically to the MA[15:3] pins at all times (other than during nRESET assertion). Memory Write Strobe nMWR O8 Program Memory Write; active low Memory Read Strobe nMRD O8 Program Memory Read; active low Memory Chip Enable nMCE O8 Program Memory Chip Enable; active low. This signal is asserted, when any of the following conditions are no longer met: 1. IDLE bit (PCON.0) is 1. 2. INT2 is negated 3. SLEEP bit of CLOCK_SEL is 1. Note: This signal is held to a logic ‘high’ while nRESET is asserted. MISC General Purpose I/O GPIO1 I/O8 This pin may be used either as input, edge sensitive interrupt input, or output. General Purpose I/O GPIO2 I/O8 This pin may be used either as input, edge sensitive interrupt input, or output. General Purpose I/O GPIO3 I/O8 This pin may be used either as input, edge sensitive interrupt input, or output. General Purpose I/O GPIO4 I/O8 This pin may be used either as input, edge sensitive interrupt input, or output. General Purpose I/O GPIO5 I/O8 This pin may be used either as input, edge sensitive interrupt input, or output. NAME SYMBOL BUFFER TYPE DESCRIPTION |
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