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UPSD3422 Datasheet(PDF) 256 Page - STMicroelectronics |
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UPSD3422 Datasheet(HTML) 256 Page - STMicroelectronics |
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256 / 293 page  PSD module uPSD34xx 256/293 28.6.6 Recommended JTAG connector There is no industry standard JTAG connector. STMicroelectronics recommends a specific JTAG connector and pinout for uPSD3xxx so programming and debug equipment will easily connect to the circuit board. The user does not have to use this connector if there is a different connection scheme. The recommended connector scheme can accept a standard 14-pin ribbon cable connector (2 rows of 7 pins on 0.1” centers, 0.025” square posts, standard keying) as shown in Figure 94. See the STMicroelectronics “FlashLINK, FL-101 User Manual” for more information. Figure 94. Recommended JTAG connector 28.6.7 Chaining uPSD34xx devices It is possible to chain a uPSD34xx device with other uPSD34xx devices on a circuit board, and also chain with IEEE 1149.1 compliant devices from other manufacturers. Figure 95 on page 257 shows a chaining example. The TDO of one device connects to the TDI of the next device, and so on. Only one device is performing JTAG operations at any given time while the other two devices are in BYPASS mode. Configuration for JTAG chaining can be made in PSDsoft Express by choosing “More than one device” when prompted about chaining devices. Notice in Figure 95 on page 257 that the uPSD34xx devices are chained externally, but also be aware that the two die within each uPSD34xx device are chained internally. This internal chaining of die is transparent to the user and is taken care of by PSDsoft Express and 3rd party JTAG tool software. The example in Figure 95 on page 257 also shows how to use 6-pin JTAG when chaining devices. The signals TSTAT and TERR are configured as open-drain type signals from PSDsoft Express. This facilitates a wired-OR connection of TSTAT signals from multiple uPSD34xx devices and also a wired-OR connection of TERR signals from those same multiple devices. PSDsoft Express puts TSTAT and TERR signals into open-drain mode by default, requiring external pull-up resistors. Click on 'Properties' in the JTAG-ISP window of PSDsoft Express to change to standard CMOS push-pull outputs if desired, but wired-OR logic is not possible in CMOS output mode. TDO TCK TMS VCC TDI GND JEN TERR GND GND RST TSTAT CNTL TRST 14 12 10 13 11 9 7 8 6 5 4 3 2 1 KEY WAY VIEW: Looking into face of shrouded male connector, with 0.025" posts on 0.1" centers. Connector reference: Molex 70247-1401 This connector accepts a 14-pin ribbon cable such as: • Samtec: HCSD-07-D-06.00-01-S-N • Digikey: M3CCK-14065-ND AI09187 |
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