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LRI64-A1S/XXX Datasheet(PDF) 19 Page - STMicroelectronics |
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LRI64-A1S/XXX Datasheet(HTML) 19 Page - STMicroelectronics |
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19 / 38 page  19/38 LRI64 TIMING DEFINITIONS Figure 22. shows three specific delay times: t1, t2 and t3. All of them have a minimum value, speci- fied in Table 14.. The t1 parameter also has a max- imum and a typical value specified in Table 14., as summarized in Table 8. Table 8. Timing Values Note: 1. tSOF is the duration for the LRI64 to transmit an SOF to the VCD. 2. t1(max) does not apply for write alike requests. Timing conditions for write alike requests are defined in the com- mand description. 3. The tolerance of specific timings is ± 32/fC. LRI64 Response Delay, t1 Upon detection of the rising edge of the EOF re- ceived from the VCD, the LRI64 waits for a time equal to t1(typ) = 4352 / fC before starting to transmit its response to a VCD request, or switching to the next slot when in an in- ventory process. VCD New Request Delay, t2 t2 is the time after which the VCD may send an EOF to switch to the next slot when one or more LRI64 responses have been received during an in- ventory command. It starts from the reception of the EOF received from the LRI64 devices. The EOF sent by the VCD is 10% modulated, in- dependent of the modulation index used for trans- mitting the VCD request to the LRI64. t2 is also the time after which the VCD may send a new request to the LRI64 as described in Figure 19. t2(min) = 4192 / fC VCD New Request Delay when there is No LRI64 Response, t3 t3 is the time after which the VCD may send an EOF to switch to the next slot when no LRI64 re- sponse has been received. The EOF sent by the VCD is 10% modulated, in- dependent of the modulation index used for trans- mitting the VCD request to the LRI64. From the time the VCD has generated the rising edge of an EOF: – The VCD waits for a time at least equal to the sum of t3(min) and the typical response time of an LRI64, which depends on the data rate and subcarrier modulation mode, before sending a subsequent EOF. Min. Typ. Max. t1 t1(min) t1(typ) = 4352 / fC t1(max) t2 t2(min) = 4192 / fC —— t3 t1(max) + tSOF (see notes1,2) —— |
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