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PDSP16510AC0AC Datasheet(PDF) 8 Page - Mitel Networks Corporation |
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PDSP16510AC0AC Datasheet(HTML) 8 Page - Mitel Networks Corporation |
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8 / 25 page  PDSP16510 8 with a number of DOS strobes (see "user notes - stopping DOS") once a transform is complete in order to transfer data to the output pins. DAV will not go active until this priming has occurred. The state of the DEN input at the end of a transform is used to control the transition of the active going edge of the DAV output with respect to the DOS strobes. The latter are then used to transfer data from the device to the next system component. If the DEN input is tied low in a single device system, the active going DAV transition will be internally synchronised to the rising edge of a DOS clock. If DEN is not tied low it must be guaranteed to be low at the end of the internal transform operation for this synchronization to occur. Since there is no external indication of this event, the user must take care to only allow DEN to go high whilst DAV is active, if this DAV synchronous mode is needed. SYNCHRONIZED DAV OPERATION In the DAV synchronised mode the first rising edge of the DOS clock, after DAV has gone active, must be used to transfer the first transformed sample from the output pins to the next system component. It should be noted that the output buffer will have been primed before the active DAV transition, since DOS must be a continuous clock, and there is then no delay before the first output becomes valid. The DAV output can be used as a clock enable for this next device, and transfers will continue in normal sequential order until the required data has been dumped. DAV will then go inactive in response to the last DOS edge which was used to transfer data to the next device. This mode of automatically dumping data when it is ready finds applications in real time data flow systems, and detailed timing is given in Table 2. It should be noted that the DOS input MUST be continually present before DAV goes active. If this is not the case the DAV output will not go active at the correct time, and the internal output circuitry will not be primed. Once DAV is active, however, it is possible for DOS to be irregular, and DEN can be used to inhibit the action of the output strobe as discussed previously. For the correct operation of the device the user must ensure that DOS becomes continuous and DEN remains low once DAV goes in-active. When continuously transforming data such that new outputs are internally available before the previous block has been completely dumped, then DAV would normally stay active and give no indication that one block dump had been finished and another block started. Additional internal circuitry is, however, provided to ensure that DAV goes inactive for one DOS high time, thus supplying an inter block marker. ASYNCHRONOUS DAV MODE If DEN is not active in a single device when the transform is complete, then the device will wait for DEN to go active before any data is dumped. This mode is suitable for applica- tions in which output processing is under the control of a remote host, such as a general purpose digital signal proces- sor. The DAV output will then go active as soon as the output buffer is full, and will not be synchronised to the DOS edge. In such systems the DOS strobe may not necessarily be present at this time. Table 3 gives the relevant timing information. In this host controlled dump mode the PDSP16510 waits for the host to activate the DEN input after DAV has gone active. DEN then functions as an enable for the host produced data strobes on the DOS pin. DEN may either stay active for the complete transfer, or may be used to enable each DOS Characteristic Symbol Min Max Units Output Enable Time T LZ 15 ns Output Disable Time T HZ 15 ns Data Delay Time ( 30 pf load ) T DD 15 ns Data Hold Time T DH 2 ns DAV active Delay Time ( 30 pf load ) T VD 1 10 ns DAV in active Delay Time ( 30 pf load ) T VI 1 10 ns Table 2. Output Timing with DEN tied low. ( Advanced Data ) TVD DOS DATA O/P DAV 1 TDD TLZ TDH TDD N THZ TVI Scale Tag Value O/P 1 O/P 2 S3:0 16510A,A0,B0,C0 |
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