Provides a mechanism for overriding the software debug lock SWL_DEBUG without requiring any interaction with an external intelligence. This service is similar to One-Time Passcode but has selective unlocking capability and does not require a FPGA nonce.
Table 1. One Way Passcode Service Request
| System Service Descriptor Bit Field |
Value |
Description |
| 15:7 |
MBOXADDR[10:2] |
Mailbox address. |
| 6:0 |
7DH |
One-way Passcode service command. |
The following table lists the One Way Passcode service mailbox format.
Table 2. One Way Passcode Service Mailbox Format
| Offset |
Length (bytes) |
Parameter |
Direction |
Description |
| 0 |
16 |
MSG ID |
Input |
Message identification |
| 16 |
32 |
V |
Input |
Input Validator |
| 48 |
2 |
BSVER |
Input |
Not used. Value Ignored |
| 50 |
1 |
CTYPE |
Input |
| 51 |
1 |
KEYMODE |
Input |
— |
| 52 |
16 |
UID |
Input |
Not used. Value Ignored1 |
| 68 |
16 |
DSN |
Input |
— |
| 84 |
256 |
USERDATA |
Input |
Not used. Value Ignored1 |
| 340 |
1 |
OPTIONS |
Input |
| 341 |
1 |
RESERVED |
Input |
Reserved |
| 342 |
2 |
SWVER |
Input |
Not used. Value Ignored1 |
| 344 |
8 |
RESERVED |
Input |
Reserved |
| 352 |
32 |
HASH |
Input |
Hash of next 96 bytes |
| 384 |
32 |
Plaintext Passcode |
Input |
Encrypted via bitstream mechanism |
| 416 |
16 |
HWM |
Input |
Encrypted via bitstream mechanism |
| 432 |
8 |
LOCKMASK |
Input |
Encrypted via bitstream mechanism Not used. Value Ignored1
SWL_DEBUG always chosen.
|
| 440 |
1 |
PCYTPE |
Input |
Encrypted via bitstream mechanism Not used. Value Ignored1
PCTYPE=1 DPK always chosen.
|
| 441 |
7 |
RESERVED |
Input |
Reserved |
| 448 |
32 |
TNEXT |
Input |
Not used. Value Ignored1 |
| (1) Value of 0 must be used for value ignored. |
|