The invention is a petroleum well downhole logging tool (0) comprising—a wireline telemetry controller unit (6) comprising—a downhole modem (61) for transmitting data at a first bitrate uplink on a wireline (8) to a surface telemetry unit (106) connected to a surface read-out unit (SRO) with a memory (123)), a server toolbus controller (62) connected between said downhole modem (61) and an internal tool databus (7) operating at a second bitrate (r2) higher than the first bitrate;—one or more logging tools (4) each with sensors (40a, 40b, 40c, . . . ), each with a client toolbus controller (42) connected on said tool databus (7), said downhole logging tool (0) further comprising—a memory tool unit (2) with a memory section (21) with relatively high IO speed and capacity and connected to said internal tool databus (7) via a memory tool client toolbus controller (42m) connected to said tool databus (7) and arranged for communicating with said server toolbus controller (62), said memory tool (2) further p
