Reconfigurable electronic device having interconnected data storage devices
A reconfigurable electronic device ( 100 ), e.g., a field programmable gate array (FPGA) or another type of complex programmable logic device (CPLD), has a first data storage device ( 120 ) and a second storage device ( 220 ) that are interconnected in a dual port memory mode of the reconfigurable electronic device ( 100 ). In this mode, the first data storage device ( 120 ) is accessible by a first decoder ( 140 ) both in a read as well as in a write mode, and the second data storage device ( 120 ) is accessible by a second decoder ( 140 ) in a read mode, thus providing an efficient dual port memory implementation. In a preferred embodiment, the first data storage device ( 120 ) is coupled to the second data storage device ( 220 ) via a configurable data copy circuit ( 160 ) that is responsive to a configuration signal provided via a configuration signal input ( 170 ), thus allowing for a very area efficient implementation of a dual port memory for reconfigurable electronic device ( 100 ).
1. A reconfigurable electronic device, comprising:
a first data storage device being responsive to a control signal;
a second data storage device being responsive to a further control signal, the second data storage device being coupled to the first data storage device for receiving a data copy from the first data storage device;
a first address decoder coupled to the first data storage device for allowing a read access of the first data storage device; and
a second address decoder coupled to the second data storage device for allowing a read access of the second data storage device;
characterized in that the first address decoder is arranged to allow a write access of the first data storage device.
2. A reconfigurable electronic device as claimed in claim 1 , characterized in that:
the read access of the first data storage device is enabled during a first phase of the control signal and the write access of the first data storage device is enabled during a second phase of the control signal;
the read access of the second data storage device is enabled during a first phase of the further control signal and a data copy action from the first data storage device to the second storage device is enabled during a second phase of the further control signal;
the first phase of the control signal occurring before the second phase of the control signal.
3. A reconfigurable electronic device as claimed in claim 1 , characterized in that the second data storage device has a second plurality of data storage elements coupled to a first plurality of data storage elements of the first data storage device via a configurable data copy circuit.
4. A reconfigurable electronic device as claimed in claim 3 , characterized in that the data copy circuit comprises a data copy cell for coupling a data storage element from the first data storage device to a further data storage element from the second data storage device, the data copy cell comprising an enable switch coupled to a driver circuit.
5. A reconfigurable electronic device as claimed in claim 1 , characterized in that the first data storage device and the second data storage device are look-up tables.