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Disclosed is a means to prevent the CPU from sending too much data to the memory card (stops present writes or holds off future writes), but allows present and future reads to continue.
English (United States)
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Early Hold that Allows Reads on Other Cards to Continue
Disclosed is a means to prevent the CPU from sending too much data to the
memory card (stops present writes or holds off future writes), but allows present
and future reads to continue.
This scheme is for a system that the CPU can send data to a memory card
faster than the memory card can write the data into the DRAMs. The memory
cards must have buffers for write data.
In this method for data HOLD the memory card must be able to predict when
its buffers will fill up with data. The HOLD is activated before the data transfers
must stop. This allows time for the pipe-line stages to empty. After the HOLD is
released, the memory card may receive data again.
If the pending write is NOT complete after the pipe-line is empty; then the
write will continue when HOLD is released. If the pending write is complete after
the pipe-line is empty and a read is next; then the read may start immediately. If
the pending write is complete after the pipe-line is empty and a write is next; then
the next write will start when HOLD is released.