| 摘要 |
Improved ISDN interface apparatus (10) and methods permit dual mode access to an on-board memory (36). A first memory controller (38) is provided that responds to addresses in a first address range to read, write or otherwrite access data in an "on-board" memory (36) a first memory access mode. A second memory controller (40) is provided that responds to addresses in a second address range to access data to that memory (36) in a second memory access mode. Multiplexing circuitry (42) selectively applies control signals from the first or second memory controllers (38 or 40) to the memory (36), thereby, causing it to read, write or otherwise access data according to the first or second modes. The aforementioned first and second modes can constitute differing memory access modes. Thus, for example, first mode is a single-beat memory access mode, according to one practice of the invention. The second mode can comprise, on the other hand, for example, a burst mode.
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