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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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SMS8198 Fiches technique(PDF) 2 Page - Summit Microelectronics, Inc. |
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SMS8198 Fiches technique(HTML) 2 Page - Summit Microelectronics, Inc. |
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2 / 14 page  2 SMS8198 2036 5.0 4/18/00 SMS8198 Tri Media Processor SDA System Boot Block SCL TRI_RESET# VCR/Monitor Audio Local Reset Audio Camera TRI_RESET# PCI_RESET# PCI Bus WP Peripheral Peripheral 2036 ILL16.0 Figure 1. Typical Implementation of the SMS8198 and TriMedia Processor The boot hardware operation begins with the assertion of the reset signal TRI_RESET#. The TRI_RESET# output from the SMS8198 is guaranteed to be valid at VCC -1.0V. The reset output is asserted whenever VCC is less than the VTRIP threshold and will remain asserted after VCC is >VTRIP for the duration of tPURST. Whenever the TRI_RESET# is active the memory will be write protected. In addition to the reset write protection feature, pin 7 can be tied to a pull-up to disable the write function of the memory. This effectively turns the memory array into an inexpensive boot ROM. After reset is de-asserted, only the system boot block is allowed to operate. At this point the TriMedia processor takes over and begins to download data from the memory array into its system boot block. The data downloaded contains configuration data to set up the TriMedia proces- sor and to load special ID information into the PCI configu- ration space register. The ID information is published in the PCI configuration register to provide the 16 bit Sub- system ID and Subsystem Vendor ID. It should be noted that both the threshold and the tPURST pulse width are programmable. Not only does this provide maximum flexibility to the designer, but, as the processor operating voltage levels migrate downwards, the SMS8198 can be programmed to following this downward trend. The values can be selected from the ordering information table and the devices specified as standard off-the-shelf items. |
Numéro de pièce similaire - SMS8198 |
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Description similaire - SMS8198 |
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