Method of prioritizing subsequently received program and erase c

Details Method of prioritizing subsequently received program and erase c Method of prioritizing subsequently received program and erase c

1995-10-16

1998-09-01

Gossage, Glen

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

395736, 395737, 365218, 711103, G06F 1200, G06F 946, G11C 1602

Patent

active

058023437

ABSTRACT:
A method of prioritizing program commands relative to erase commands in an operation queue for a memory includes the step of initiating an erase of a first block for a first erase command in the operation queue. The memory has a status indicator for each block. The status indicator indicates whether an erase command for its corresponding block has been received and removed from the operation queue but not yet executed (e.g., an absorbed erase command). An interrupt window is executed during the erasure of the first block to determine if the operation queue has received a second command for a second block. If the second command is a program command, then one of three steps is executed. If the first and second blocks are the same, then execution of the program command is deferred until after the erasure of the first block is complete. If the first and second blocks are not the same then the program command is either executed or deferred in accordance with the status indicator for the second block. If the status indicator for the second block indicates that it has been absorbed (e.g., it is set), then execution of the program command will be deferred until after the erasure of the first block is complete. Otherwise, if the status indicator for the second block indicates that it has not been absorbed (e.g. not set), then the erasure of the first block will be interrupted to execute the program command.

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