fix：cmoAll and low power issues fix#484
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* In top, `io_cpu_halt` is misleading signal, as it may be mistaken for the debug command `halt`.
* Add power handshake to confirm sink Tx Queues are drained before power-down * Change return l-credit in DEACTIVATE controlled by credits (from L2 not from Sink)
- Add coEnable signal from LinkMonitor (coEnable = syscoreq && syscoack) - Gate TXREQ arbiter output with req_pass = coEnable || is_mmio - Apply bidirectional gating to both valid and ready signals: * txreq.valid = arb.out.valid && req_pass * arb.out.ready = txreq.ready && req_pass - mmio requests are always allowed regardless of coEnable state
* Shadow Buffer(32) in rx channel to receive flit from noc * When Shadow Buffer has > 16 space, reponse lcrdv right after flitv
…rom AsyncBridge" This reverts commit 5f59e1f.
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