Flash memory device
An apparatus, system, and method for controlling data transfer to an output port of a serial data link interface in a semiconductor memory is disclosed. In one example, a flash memory device may have multiple serial data links, multiple memory banks and control input ports that enable the memory device to transfer the serial data to a serial data output port of the memory device. In another example, a flash memory device may have a single serial data link, a single memory bank, a serial data input port, a control input port for receiving output enable signals. The flash memory devices may be cascaded in a daisy-chain configuration using echo signal lines to serially communicate between memory devices.
1. A flash memory device comprising:
a flash memory array;
a first control port configured to receive a chip select signal from a memory controller;
a first clock port configured to receive a first clock signal from the memory controller;
a second clock port configured to transmit a second clock signal, referenced to the first clock signal, to the memory controller;
at least one common data port configured to receive command data and address data in synchronization with the first clock signal while the chip select signal is at an active low logic state;
core circuitry configured to retrieve a read data from the flash memory array in response to the command data; and
data output circuitry configured to transmit the read data to the memory controller in synchronization with the second clock signal.
2. The flash memory device as claimed in claim 1 , further comprising a second control port configured to receive a reset signal from the memory controller.
3. The flash memory device as claimed in claim 1 , further comprising a status register configured to indicate that the flash memory device is being utilized while the read data is being retrieved from the flash memory array.
4. The flash memory device as claimed in claim 1 , further comprising a phase lock loop (PLL) to synchronize the first clock signal and the second clock signal.
5. The flash memory device as claimed in claim 1 , further comprising a delay lock loop (DLL) to synchronize the first clock signal and the second clock signal.
6. The flash memory device as claimed in claim 3 wherein the status register is accessible by the memory controller in synchronization with both rising and falling edges of the second clock signal.
7. The flash memory device as claimed in claim 1 wherein the flash memory device is multi-level-cell (MLC) flash memory device.
8. The flash memory device as claimed in claim 1 wherein the flash memory device is comprised of multi-chip package configuration having two or more stacked chips inside a single package.
9. The flash memory device as claimed in claim 8 wherein the two or more stacked chips are commonly coupled to the chip select signal.
10. The flash memory device as claimed in claim 1 wherein the at least one common data port comprises a single-bit data width.
11. The flash memory device as claimed in claim 1 wherein the at least one common data port comprises a multi-bit data width.
12. The flash memory device as claimed in claim 1 , wherein the at least one common data port is configured to receive the command data and the address data in synchronization with both rising and falling edges of the first clock signal.
13. The flash memory device as claimed in claim 1 , wherein the data output circuitry is configured to transmit the read data to the memory controller in synchronization with both rising and falling edges of the second clock signal.