Ceibo offers a broad line of development tools for embedded microcontroller and microprocessor systems. These systems include all the necessary elements to design and test projects. Ceibo supports Intel, Philips, Siemens, Dallas, Microchip, NEC, Atmel and other silicon manufacturers. Here, the company gives a rundown comparison between its emulator products.
8051 emulators
The EB-51 is a system with less features than other Ceibo emulators. EB-51 supports 40-pin DIP and 44-pin PLCC 8051 derivatives from Philips Intel, Dallas, Atmel and other compatible derivatives at 3 or 5 V. With the addition of mechanical adapters it supports Atmel low-pin count devices too. EB-51 does not have realtime trace memory or sophisticated hardware breakpoints, supporting only software breakpoints, meaning that code is replaced by a break instruction, and therefore it can only be applied to the code mapped into the emulator memory.
The EB-51X2 is an enhanced version of EB-51. This adds realtime trace, programmable clock generator and support for new faster derivatives with 6 clocks per cycle (Philips, Atmel M&W).
The DS-51 supports all 8051 derivatives from 1,5 V to 6 V. DS-51 has hardware breakpoints, that can be applied to target memory space as well, so if one has one's program on an EPROM inside the target board, one may need the hardware breakpoints. The DS-51 realtime trace can be read 'on the fly' and has testpoint clips to record any external signals as if using a logic analyser. These clips can also be used to start and stop the trace recording and generate breakpoints.
FE-xxxx series of emulators is now available for microcontrollers produced by Atmel M&W, Dallas Semiconductors, Winbond and Philips. The Flash technology is being added to all new microcontrollers to implement the code memory. Flash technology includes ISP and IAP. The ISP (in-system programming) allows loading the user code without removing the chip from the target circuit. All the available emulators (EB-51, EB-51X2, DS-51) work in emulation mode or using bondouts, or in ROMless mode, thus allowing access to the internal buses. Therefore, the actual code is in the emulator overlay RAM memory and not in the microcontroller Flash. This means ISP or IAP is never used by emulators. If one needs to emulate ISP or IAP, the only available solution is the FE-xxxx emulator.
251 emulators
The EB-C251 is a system with less features than the DS-251 and it supports only the currently available MCS-251 and C251 derivatives from Intel and Atmel M&W (formerly Temic). EB-C251 has trace and breakpoints that are less sophisticated than the DS-251. The EB-C251 has only software breakpoints, meaning that code is replaced by a break instruction, and therefore it can only be applied to the code mapped into the emulator memory.
The DS-C251 has hardware breakpoints that can be applied to target memory so if one has one's program on an EPROM in the target board, one may need the hardware breakpoints. The DS-251 has testpoint clips that can be connected to any external signals to be recorded in the trace memory as if a logic analyser is available. These clips can also be used to start and stop the trace recording and generate breakpoints.
XA emulators
The EB-XA is the system with less features than DS-XA or EB-XAV2. EB-XA does not have realtime trace memory and memory is limited to 64K for emulation. EB-XAV2 and DS-XA have longer memory capabilities and programmable clock generator, as well as realtime trace.
Note that realtime trace is a realtime function and records program counter changes due to nonsequential instructions (call, jump, interrupt, etc). The software completes the executed instructions between non-sequential instructions, so the trace depth is variable and according to this definition. This new concept allows a high performance usage of the trace memory. The EB-XAV2 records 1024 non-sequential instructions. DS-XA records 8192 non-sequential instructions. The recreated trace information is unlimited.
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