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LMX2581 Datasheet(PDF) 23 Page - Texas Instruments |
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LMX2581 Datasheet(HTML) 23 Page - Texas Instruments |
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23 / 56 page  tCES tCWH tCWL LSB CLK LE D27 D26 D25 D24 D23 D0 1 1 1 1 MSB LSB MUXout tCES tCS D27 D26 D25 D24 tCH tCWH tCWL D23 D0 A3 A2 A1 A0 LSB DATA CLK LE tES tEWH D27 D26 D25 D24 D23 D0 1 1 1 1 MSB LSB MUXout D27 LMX2581 www.ti.com SNAS601G – AUGUST 2012 – REVISED SEPTEMBER 2014 The procedure for doing this Readback is in the Serial Data Readback Timing section. Depending on the settings for the ID(R0[31]) and RDADDR (R6[8:5]), information a different bit stream will be returned as shown in Table 10. Table 10. Uses of Readback ID BUFEN PIN CE PIN READBACK CODE Readback register defined by 0 X X RDADDR. 0 0 0x 00000500 0 1 0x 00000510 1 1 0 0x 00000520 1 1 0x 00000530 8.3.14.2 Serial Timing for Readback Readback is done through the the MUXout (or LD) pin with the same clock that is used to clock in the data. • Choose either the MUXout (or LD) pin for reading back data and program the MUXOUT_SELECT (or LD_SELECT) to readback mode. • Bring the LE pin from low to high to start the readback at the MSB. • After the signal to the CLK pin goes high, the data will be ready at the readback pin 10 ns afterwards. It is recommended to read back the data on the falling edge of the clock. Technically, the first bit actually becomes ready after the rising edge of LE, but it still needs to be clocked out. • The address being clocked out will all be 1's. Because the CLK pin is both used to clock in data and clock out data, special care needs to be taken to ensure that erroneous data is not being clocked in during readback. There are two approaches to deal with this. The first approach is to actually send valid data during readback. For this approach, R6 is a recommended register and the approach is shown in Figure 18: Figure 18. Timing for Readback A second approach is to hold LE high during readback so that the clock pulses do not clock data into the part, but still function for readback purposes. Figure 19 demonstrates this method: Figure 19. Timing for Readback, Holding LE High Copyright © 2012–2014, Texas Instruments Incorporated Submit Documentation Feedback 23 Product Folder Links: LMX2581 |
Similar Part No. - LMX2581_14 |
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Similar Description - LMX2581_14 |
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