一、 part of register definition
| start | end | symbol | description |
| 0h | 7h | CAP | Controller Capabilities |
二、CAP – Controller Capabilities
This register indicates basic capabilities of the controller to host software
| Bits | Type | Reset | Description |
| 63:58 | RO | 0h | Reserved |
| 57 | RO | Impl Spec | Controller Memory Buffer Supported (CMBS) 1:the controller supports the Controller Memory Buffer note:host要使用controller memory buffer,需要host enable the Controller Memory Buffer’s controller memory space |
| 56 | RO |
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