| 摘要 |
Power consumption of a modular system (40) coupled by a bus (48) is reduced by separating the module (44) clock into two parts: (i) a low power clock (56) which provides a substantially continuous signal (100) and drives the module access logic (60), and (ii) a high power main clock driver (72) that operates only when the module (44) has detected its own address. When the access logic (60) detects the module address (104), it causes an enable/disable circuit (68) to turn on the main clock driver (72) supplying the module function logic (64), which then reads or writes to the bus (48) or performs other operations according to its internal programming or control signals on the bus (48) or both. When finished, the function logic (64) sends a shut-down signal (120) to the enable/disable circuit (68) to terminate operation of the main clock driver (72). The module returns (44) to its quiescent state until receipt of the next address event (104). <IMAGE> |
