The company said it will continue support for its current Z8 Encore! The devices are designed to meet the needs of designers working on consumer and. Microcontroller (MCU) Develop- because our kit then serves as your complete Z8 Encore!® additional cost allowing you to begin your design immedi- ately. What would be better than designing a softcore to learn more about VHDL ( VHSIC hardware I ended up choosing a modern Z relative: the Zilog Z8 Encore!.
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This is where the decoder actually decodes the opcodes, prepares buses and internal supporting signals, and steps to other execution states. To my surprise, while most of the time I could successfully send commands and receive the wth results, sometimes the design would simply freeze and stop responding. Processor Tracker – Real-time updates for select processors and development tools. The opto-isolated USB smart cable is available as a stand-alone product, and is compatible with most Z8 Encore!
That is a tough way to learn that you must always synchronize external signals prior to feeding them into complex logic! The instruction decoder reads opcodes from the instruction queue and translates them into corresponding operations.
Once fully compiled I used Quartus II v9. An instruction eesigning works within a single working register group, which is selected by an SFR named RP register pointer. Refer to Figure 4.
The decoder stage uses this number to verify that the desired number of bytes for the instruction is already available in the queue.
Zilog offers a high-end, ICE in-circuit emulator kit, which includes package adapters and event trace functions.
Simplified program memory organization. If we look at row 0x1, we can see that columns 0x0 and 0x1 are RLC instructions, and columns 0x2 up to 0x9 are ADC instructions.
More information for Zilog Z8 Encore! Note that I am not using bidirectional buses for any interconnects in this project. The program memory area is organized so that the first addresses are dedicated to special purposes. Using the FPz8 is very simple and straightforward.
This is a simple counter used by the ATM instruction it disables interrupts for three instruction cycles, allowing atomic operations. Its value is used in the last part of this stage to increment the PC program counteradvance the queue read pointer, and decrement the number of available bytes in the queue. The first implementation of FPz8 uses a very conservative and hardwired design approach with two main buses: Thus, any program microcontrol,er to it is lost when the FPGA is powered down.
Embedded Insights – Embedded Processing Directory – Zilog Z8 Encore! MC
Before sncore, make sure that debugger settings are the same as in Figure 8. Another important detail is that all instructions within the same column and group are the same size in bytes, thus can be decoded in the same decoder section.
Zilog’s DPLL digital phase lock loop control for motors runs as a timer-based interrupt service routine, and it does not require the motor to run open-loop at startup.
My OCD design implements almost all commands available on the real hardware, except for those related to data memory debug commands 0x0C and 0x0D ; the read runtime counter 0x3 ; and the read program memory CRC 0x0E. The Back EMF Sample Time Stamp is a patented applied function offering a configuration that ties two existing microcontroller blocks together to add functionality to the microcontroller.
Figure 5 shows a compressed view of the interrupt system. FPz8 includes 16, bytes of program memory implemented using synchronous block RAM which means program memory content is lost when the device is powered down.
This article is focused on learning how a microcontroller core is designed, and is intended for educational use only. Instruction decoder design started by figuring out the relation among all the instructions and addressing modes.
Building Your Own Microcontroller
The five register area buses comprise three for the file register area user RAMand another two dedicated to special function registers. One last comment regarding interrupts: Performing this action results in a smooth increase in the motor speed, as well as nearly instantaneous reversal of direction of rotation on command. This is where the actual magic happens. Can you guess why? The design makes use of a nested IF chain micrrocontroller generates a vector address upon detection of an interrupt event regarding an enabled interrupt.
With the over-current sense feature and fault input, designers can incorporate fast shutdown of the motor for anti-kick back or stall detection. Need to brush up on your electronics principles? With its lightweight IDE integrated development environment and free ANSI C compiler, it is an excellent project to learn and also teach about embedded systems.