Altera POS-PHY Level 4 IP Core - Manual (Page 122)

E–2 Appendix E: Programming the SPI-4.2 Calendar via the Avalon Memory-Mapped Interface
Programming the SPI-4.2 Calendar
POS-PHY Level 4 IP Core User Guide December 2014 Altera Corporation
1 This step is typically only required after reset or power up and prevents
accessing the calendar memories before they are configured.
2. Write a value into the CALM0 field, to set the calendar multiplier for calendar 0.
3. Write a 5 into the CALLEN0 field, to set the calendar length to 5 slots for calendar 0.
4. Map the calendar 0 slot numbers to the desired port numbers. The slots are
addressed indirectly via the CALMEM_ADR register. Write to the CALMEM_ADR register
first, to set the slot number, and then you can write the port number to the
CALMEM_DAT0
register.
a. Assign port 0 to slot 0:
■ Write 0 to CALMEM_ADR.
■ Write 0 to CALMEM_DAT0.
b. Assign port 3 to slot 1:
■ Write 1 to CALMEM_ADR.
■ Write 3 to CALMEM_DAT0.
c. Assign port 2 to slot 2:
■ Write 2 to CALMEM_ADR.
■ Write 2 to CALMEM_DAT0.
d. Assign port 3 to slot 3:
■ Write 3 to CALMEM_ADR.
■ Write 3 to CALMEM_DAT0.
e. Assign port 0 to slot 4:
■ Write 4 to CALMEM_ADR.
■ Write 0 to CALMEM_DAT0.
5. Write a value into the CALM1 field, to set the calendar multiplier for calendar 1.
6. Write a 3 into the CALLEN1 field, to set the calendar length to 3 slots for calendar 1.
7. Map the calendar 1 slot numbers to the desired port numbers:
a. Assign port 1 to slot 0:
■ Write 0 to CALMEM_ADR.
■ Write 1 to CALMEM_DAT1.
b. Assign port 2 to slot 1:
■ Write 1 to CALMEM_ADR.
■ Write 2 to CALMEM_DAT1.
c. Assign port 3 to slot 2:
■ Write 2 to CALMEM_ADR.
■ Write 3 to CALMEM_DAT1.
8. Enable the status channel by writing a 0 to the RSFRM bit, if required.