Memory device and memory system including the same
Provided are a memory device and a memory system including the same. The memory device may include a data bus inversion (DBI) mode selector configured to select a first multi-bit DBI signal from among a plurality of multi-bit DBI signals respectively corresponding to a plurality of DBI modes according to multi-bit data; a multi-mode DBI encoder configured to generate encoded multi-bit data by DBI encoding the multi-bit data according to the first multi-bit DBI signal; and a transceiver configured to transmit a data symbol corresponding to the encoded multi-bit data through a data channel and transmit a DBI symbol corresponding to the first multi-bit DBI signal through a DBI channel.
1. A memory device, comprising:
a data bus inversion (DBI) mode selector configured to select a first multi-bit DBI signal from among a plurality of multi-bit DBI signals respectively corresponding to a plurality of DBI modes according to multi-bit data;
a multi-mode DBI encoder configured to generate encoded multi-bit data by DBI encoding the multi-bit data according to the first multi-bit DBI signal; and
a transceiver configured to transmit a data symbol corresponding to the encoded multi-bit data through a data channel and transmit a DBI symbol corresponding to the first multi-bit DBI signal through a DBI channel.
2. The memory device as claimed in claim 1 , wherein:
the multi-bit data includes 2-bit data, and
each of the plurality of multi-bit DBI signals includes a 2-bit signal.
3. The memory device as claimed in claim 2 , wherein the plurality of DBI modes include:
a first DBI mode in which all bits of the 2-bit data are not inverted;
a second DBI mode in which only a least significant bit (LSB) of the 2-bit data is inverted;
a third DBI mode in which only a most significant bit (MSB) of the 2-bit data is inverted; and
a fourth DBI mode in which all bits of the 2-bit data are inverted.
4. The memory device as claimed in claim 2 , wherein the transceiver includes:
a data transceiver configured to generate the data symbol having one voltage level from among first to fourth voltage levels, from the 2-bit data by using a pulse amplitude modulation (PAM)-4 scheme; and
a DBI transceiver configured to generate the DBI symbol having one voltage level from among the first to fourth voltage levels, from the first multi-bit DBI signal by using the PAM-4 scheme.
5. The memory device as claimed in claim 1 , wherein:
the multi-bit data includes 3-bit data,
each of the plurality of multi-bit DBI signals includes a 3-bit signal, and the transceiver includes:
a data transceiver configured to generate the data symbol having one voltage level from among first to eighth voltage levels, from the 3-bit data by using a pulse amplitude modulation (PAM)-8 scheme; and
a DBI transceiver configured to generate the DBI symbol having one voltage level from among the first to eighth voltage levels, from the first multi-bit DBI signal by using the PAM-8 scheme.
6. The memory device as claimed in claim 1 , wherein the DBI mode selector is further configured to select the first multi-bit DBI signal such that a transmission consumption current for the data symbol is minimized.
7. The memory device as claimed in claim 1 , wherein:
the data channel includes a plurality of data channels,
the multi-mode DBI encoder includes a plurality of multi-mode DBI encoders configured to generate a plurality of pieces of encoded multi-bit data by DBI encoding a plurality of pieces of multi-bit data, respectively, according to the first multi-bit DBI signal, and
the transceiver includes a plurality of data transceivers configured to transmit a plurality of data symbols corresponding to the encoded multi-bit data through the plurality of data channels, respectively.
8. The memory device as claimed in claim 7 , wherein the DBI mode selector is further configured to count a number of each of a plurality of data patterns in the multi-bit data, and, based on the counted numbers, select the first multi-bit DBI signal such that a transmission consumption current for the plurality of data symbols is minimized.
9. The memory device as claimed in claim 7 , wherein:
the DBI mode selector includes:
a first DBI mode selector configured to select the first multi-bit DBI signal from among the plurality of multi-bit DBI signals, according to a data pattern of first multi-bit data from among the multi-bit data; and
a second DBI mode selector configured to select a second multi-bit DBI signal from among the plurality of multi-bit DBI signals, according to a data pattern of second multi-bit data from among the multi-bit data, and
the plurality of multi-mode DBI encoders include:
a first multi-mode DBI encoder configured to generate first encoded multi-bit data by DBI encoding the first multi-bit data, according to the first multi-bit DBI signal; and
a second multi-mode DBI encoder configured to generate second encoded multi-bit data by DBI encoding the second multi-bit data, according to the first multi-bit DBI signal.
10. The memory device as claimed in claim 9 , wherein the transceiver further includes:
a first DBI transceiver configured to transmit a first DBI symbol corresponding to the first multi-bit DBI signal through a first DBI channel; and
a second DBI transceiver configured to transmit a second DBI symbol corresponding to the second multi-bit DBI signal through a second DBI channel.
11. The memory device as claimed in claim 1 , further comprising a multi-mode DBI decoder, wherein:
the transceiver is further configured to receive an input data symbol through the data channel and receive an input DBI symbol through the DBI channel, and
the multi-mode DBI decoder is configured to generate multi-bit input data by DBI decoding encoded multi-bit input data corresponding to the input data symbol, according to a multi-bit input DBI signal corresponding to the DBI input symbol.
12. The memory device as claimed in claim 1 , further comprising a memory cell array configured to store the multi-bit data, the memory cell array including a plurality of DRAM cells.
13. A memory device, comprising:
a transceiver configured to receive a data symbol and a data bus inversion (DBI) symbol through a data channel and a DBI channel, respectively, generate encoded multi-bit data from the received data symbol, and generate a multi-bit DBI signal from the received DBI symbol; and
a multi-mode DBI decoder configured to generate multi-bit data by DBI decoding the encoded multi-bit data according to the multi-bit DBI signal.
14. The memory device as claimed in claim 13 , wherein:
the multi-bit data includes 2-bit data, and
the multi-bit DBI signal includes a 2-bit signal.
15. The memory device as claimed in claim 14 , wherein the multi-bit DBI signal represents one of a plurality of DBI modes, the plurality of DBI modes including:
a first DBI mode in which all bits of the 2-bit data are not inverted;
a second DBI mode in which only a least significant bit (LSB) of the 2-bit data is inverted;
a third DBI mode in which only a most significant bit (MSB) of the 2-bit data is inverted; and
a fourth DBI mode in which all bits of the 2-bit data are inverted.
16. The memory device as claimed in claim 13 , wherein the transceiver includes:
a data transceiver configured to generate the encoded multi-bit data from the data symbol having one voltage level from among first to eighth voltage levels by using a pulse amplitude modulation (PAM)-4 scheme; and
a DBI transceiver configured to generate the multi-bit DBI signal from the DBI symbol having one voltage level from among the first to fourth voltage levels by using the PAM-4 scheme.
17. The memory device as claimed in claim 13 , wherein:
the data channel includes a plurality of data channels,
the transceiver includes a plurality of data transceivers configured to receive a plurality of data symbols through the plurality of data channels and generate a plurality of pieces of encoded multi-bit data from the received data symbols, and
the multi-mode DBI decoder includes a plurality of multi-mode DBI decoders configured to generate a plurality of pieces of multi-bit data by DBI decoding the encoded multi-bit data, respectively, according to the multi-bit DBI signal.
18. The memory device as claimed in claim 13 , wherein:
the data channel includes a plurality of data channels,
the DBI channel includes a first DBI channel and a second DBI channel, the transceiver includes:
a plurality of data transceivers configured to receive a plurality of data symbols including first and second data symbols through the plurality of data channels and generate encoded first and second multi-bit data from the received first and second data symbols, respectively;
a first DBI transceiver configured to receive a first DBI symbol through the first DBI channel and generate a first multi-bit DBI signal from the received first DBI symbol; and
a second DBI transceiver configured to receive a second DBI symbol through the second DBI channel and generate a second multi-bit DBI signal from the received second DBI symbol, and
the multi-mode DBI decoder includes:
a first multi-mode DBI decoder configured to generate first multi-bit data by DBI decoding the encoded first multi-bit data according to the first multi-bit DBI signal; and
a second multi-mode DBI decoder configured to generate second multi-bit data by DBI decoding the encoded second multi-bit data according to the second multi-bit DBI signal.
19. The memory device as claimed in claim 13 , further comprising a memory cell array configured to store the multi-bit data, the memory cell array including a plurality of DRAM cells.