From: Doug M. <mar...@sy...> - 2001-07-04 14:19:51
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First a couple of questions; 1. What is the state of /RDY? 2. What is the state of /MRESET? 3. What is the state of /TRST? 4. During power up reset and operation what was the mode pin settings, = and was the correct timing observed? 5. What type of memory and in what configuration is the memory = configured? Getting the board to read the reset vector is the first hurdle. The = second hurdle with the SH4 is the proper start timing configuration for = DRAM/SDRAM! Doug Martens Senior Design Engineer mar...@sy... 1000 Waverley St. Winnipeg, MB, Canada R3T 0P3 Symbol Technologies, Winnipeg Ph: (204) 478-8046 www.symbol.com >>> Barkuson <bar...@ya...> 07/04/01 08:42AM >>> Hi, Firstly, my apologies for sending this mail if this is not relevent to the mailing list. However, this is quite urgent, sorry. Could any hardware people help me out please? I have a custom Sh4 (SH7750) board which has not been able to run :(. Everything looks alright except that the board boots up and sits at address 0x00000000 (the data at this address in the flash memory is on the data bus). The CPU seems to halt at this point with the following board status, - both main crystal and rtc crystal running - both status pin at low level - all NMI and IRL pins pulled up - BREQ pulled up - address sits at 0x00000000 and does not increments - CS0 low=20 - RD low - all WE high Is there anything else that I should check?? or any setting that I could be missing?? Can anyone direct me to a right place?? All helps are greatly appreciated.=20 Mark ___________________________________________________________________________= __ http://messenger.yahoo.com.au - Yahoo! Messenger - Voice chat, mail alerts, stock quotes and favourite news and lots more! |