USERCODE Service

Fetches the 32-bit USERCODE/Silicon signature.

Table 1. USERCODE Service Request
System Service Descriptor Bit Field Value Description
15:7 MBOXADDR[10:2] Mailbox address. See Table 2.
6:0 01H USERCODE service command

The following table lists the USERCODE Service mailbox format.

Table 2. USERCODE Service Mailbox Format
Offset Length (bytes) Parameter Direction Description
0 4 USERCODE Output Device USERCODE