Dedicated commands for memory operations

An apparatus, comprising:

• a memory comprising an array of resistance variable memory cells;
• and
• a controller configured to:
• write all cells in a number of groups of the resistance variable memory cells to a first state, changing, to the first state, only those cells currently in a second state without use of a user data pattern;
• and
• determine that the user data pattern comprises a first quantity of data values corresponding to the second state which is greater than a second quantity of data values corresponding to the first state;
• responsive to determining that the first quantity of data values is greater than the second quantity of data values, invert the user data pattern prior to storing the user data pattern in a target group from the number of groups of the resistance variable memory cells so that data values previously corresponding to the second data state correspond to the first data state and data values previously corresponding to the first data state correspond to the second data state;
• responsive to memory cells in the number of groups of the resistance variable memory cells being in the first state and receipt of a dedicated command, write the inverted user data pattern to the target group of the number of groups without first determining states of the cells in the target group.

An apparatus, comprising:

• a memory comprising an array of resistance variable memory cells;
• and
• a controller configured to:
• write all cells in a number of groups of the resistance variable memory cells to the first state, changing, to the first state, only those cells currently in a second state without use of a first user data pattern;
• and
• after all the cells in the number of groups are in the first state, write, in response to a dedicated command received to the memory from a different controller, a second user data pattern to a target group of the number of groups without first determining the states of the target group by:
• determining whether the second user data pattern comprises more data values corresponding to the second data state than the first data state;
• and
• responsive to determining that the second user data pattern comprises more data values corresponding to the second data state than the first data state, performing pattern inversion prior to storing the second user data pattern in the target group so that data values previously corresponding to the second data state correspond to the first data state and data values previously corresponding to the first data state correspond to the second data state.