| Number | 87
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| Category | errata
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| Synopsis | 17.2.8: $readmem default start_addr should be lowest address
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| State | lrmdraft
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| Class | errata-simple
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| Arrival-Date | Jul 31 2002
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| Originator | Tom Fitzpatrick <tfitz@cadence.com>
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| Release | 2001b: 17.2.8
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| Environment |
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| Description |
17.2.8 describes $readmem. It says that when start_addr is not specified, the default start_addr is the left-hand address in the memory declaration. It says that if start_addr is specified, but not finish_addr, then it starts at start_addr and goes in direction of right-hand address in memory declaration. Correct description is that if start_addr is not specified, it starts at lowest addr. If start_addr is specified, but not finish_addr, it starts at start_addr and counts toward highest addr. See http://boydtechinc.com/btf/archive/btf_1998/0395.html http://boydtechinc.com/btf/archive/btf_2000/1074.html http://boydtechinc.com/btf/archive/btf_2000/1108.html |
| Fix |
Changes based on http://boydtechinc.com/btf/archive/btf_1998/0395.html 1. CHANGE 1st sentence in para. 7 FROM: If no addressing information is specified within the system task, and no address specifications appear within the data file, then the default start address shall be the left-hand address given in the declaration of the memory. TO: If no addressing information is specified within the system task and no address specifications appear within the data file, then the default start address shall be the lowest address in the memory. 2. CHANGE 3rd sentence FROM: If the start address is specified in the task without the finish address, then loading shall start at the specified start address and shall continue towards the right-hand address given in the declaration of the memory. TO: If the start address is specified in the task without the finish address, then loading shall start at the specified start address and shall continue upward towards the highest address in the memory. 3. CHANGE para. 8 FROM: If both start and finish addresses are specified as parameters to the task, then loading shall begin at the start address and shall continue toward the finish address, regardless of how the addresses are specified in the memory declaration. TO: If both start and finish addresses are specified as parameters to the task, then loading shall begin at the start address and shall continue toward the finish address. Note that if the start address is greater than the finish address, then the address will be decremented between consecutive loads rather than being incremented. Loading shall continue to follow this direction even after an address specification in the data file. 4. CHANGE para. 10 FROM: A warning message shall be issued if the number of data words in the file differs from the number of words in the range implied by the start through finish addresses. TO: A warning message shall be issued if the number of data words in the file differs from the number of words in the range implied by the start through finish addresses and no address specifications appear within the data file. |
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