Number of DU supported by CU

Hi NR Experts,
Anyone having idea for number of DU supported by CU?
I read number as 128
Then per DU we can have 6 NR cells.
Query any specs reference for this or is it vendor specific?

It should be vendor specific I think.

1024 cells allowed under gNB-CU
up to 8 cells per gNB-DU
up to 128 NRDUs per CU can be configured