# APB Protocol (IHI0024E)
# [Overview](/dUDoz_OcRSy08cEo4LlIxw)
# [Properties](/1zcjhSwKRrej3H_Wz35E4Q)
# Signal Descriptions
- [Global Signal](/tYtOnsw5SHiK61RYhrgRVw)
- [Requester Signal](/ZG7CFRYNS4yniTnhXbIwIA)
- [Completer Signal](/4AzDN2oHRWCjFIMweHqN1w)
- [Address & Data Bus ](/cALqvQjuQnieh9kWdA_J0A)
# Transfers
- [Write Transfer](/bWQMRvxaSuGxHODbqfc7KA)
- [Read Transfer](/8I8Z6xpKR3CxS45RnB5cVA)
# [Error Response](/PbncA7bzQDOuQFhAs27NQA)
# Secure Level
- [Protect Unit](/GgDX9T6iSCy7PXESgOEHmw)
- [RME](/WdfASQCSSXK1hHxzO7Zndw)
# [Wake-Up Signaling](/EnGiz16yRuaPRHRESZrILg)
# [APB States](/swiFseoCQamq8G4HXug8CQ)
# [User Defined Signals](/MNEwy_tBTx-CUvAbXgjGPw)
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###### tags: `APB`, `AMBA`, `Notebook`
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