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SMS01GAF Datasheet(PDF) 35 Page - Numonyx B.V |
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SMS01GAF Datasheet(HTML) 35 Page - Numonyx B.V |
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35 / 61 page  SMSxxxAF, SMSxxxFF, SMSxxxBF Timings 35/61 6 Timings The symbols listed in Table 24 are used in all timing diagrams. The difference between P-bits and Z-bits is that P-bits are actively driven to High by the card or the host output driver whereas Z-bits are driven to High and kept High by the pull-up resistors RCMD and RDAT. P-bits, which are actively driven High, are less sensitive to noise. All timing values are defined in Table 25 6.1 Command and Response The host command and the card response are both clocked out on the rising edge of the host clock. 6.1.1 Card Identification and Operating Conditions Timings The timings for CMD2 (ALL_SEND_CID) and ACMD41 are shown in Figure 17 The command is followed by two Z-bits (to leave time for the bus to switch direction) and then by P-bits pushed up by the responding card. The card response to the host command starts after NID clock cycles. Table 24. Timing Diagram Symbols Symbol Description S Start bit (= ‘0’) T Transmitter bit (Host = '1', Card = '0') P One-cycle pull-up (= '1') E End bit (=1) Z High impedance state (-> = '1') D Data bits X Don't Care data bits (from card) * Repetition CRC Cyclic redundancy check bits (7 bits) Card active Host active |
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