DATA TRANSFER APPARATUS WITH CONTROL OF BUSES TO OPTIMIZE DATA TRANSFER
First Claim
1. A data transfer apparatus comprising:
- (A) a first portion in an externally-writable data storing area configured to store a first size of data to be relayed from a target device on a primary bus to a master device on a secondary bus;
(B) a second portion in the externally-writable data storing area configured to store a second size of data to be relayed from a target device on the secondary bus to a master device on the primary bus;
(C) a first data storage;
(D) a second data storage;
(E) a primary bus master block configured to read data from a target device on the primary bus and write the data into the first data storage while occupying the primary bus until the size of data stored in the first data storage reaches the first size of data; and
(F) a secondary bus master block configured to read data from a target device on the secondary bus and write the data into the second data storage while occupying the secondary bus until the size of data stored in the second data storage reaches the second size of data.
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Accused Products
Abstract
A bus bridge is connected to a primary bus and a secondary bus, and relays data between a master and a target which are each connected to a different one of the primary and secondary buses. The bus bridge includes a primary bus interface, a secondary bus interface, a data FIFO, and a register block. The register block, which can be written by the master, includes two registers corresponding to the primary and secondary buses. Relay information showing the number of entries of data to be relayed from the target to the master is registered in a register corresponding to a bus to which the target is connected. In a read transaction, the primary bus interface or the secondary bus interface reads data from the target until data of the amount shown by the registered relay information is stored in the data FIFO.
19 Citations
8 Claims
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1. A data transfer apparatus comprising:
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(A) a first portion in an externally-writable data storing area configured to store a first size of data to be relayed from a target device on a primary bus to a master device on a secondary bus; (B) a second portion in the externally-writable data storing area configured to store a second size of data to be relayed from a target device on the secondary bus to a master device on the primary bus; (C) a first data storage; (D) a second data storage; (E) a primary bus master block configured to read data from a target device on the primary bus and write the data into the first data storage while occupying the primary bus until the size of data stored in the first data storage reaches the first size of data; and (F) a secondary bus master block configured to read data from a target device on the secondary bus and write the data into the second data storage while occupying the secondary bus until the size of data stored in the second data storage reaches the second size of data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification