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A gNB may consist of a gNB-CU-CP, multiple gNB-CU-UPs and multiple gNB-DUs;
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One gNB-DU is connected to only one gNB-CU-CP;
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One gNB-CU-UP is connected to only one gNB-CU-CP;
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One gNB-DU can be connected to multiple gNB-CU-UPs under the control of the same gNB-CU-CP;
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One gNB-CU-UP can be connected to multiple DUs under the control of the same gNB-CU-CP;
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Here I try to depict the functional split of RNL(Layer 2) between gNB-CU and gNB-DU based on 3GPP specification.
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