I would like use the TZASC module linked to OCRAMsys0 & OCRAMsys1
In chapter 66 , we have a register for enable this module (ACTZS TrustZone Enable Register (MSCM_TZENR) )
We must modify the field TZENi
TrustZone Enable (i = 1, 3-7, 9, 11). This field enables/disables each Trust Zone address space controller. Once
asserted, the individual bit remains set.
if TZENi = 0, the TZASC module is disabled and logically bypassed.
if TZENi = 1, the TZASC module is enabled.
The individual TZENi are mapped to the following TZASC modules:
1 = FlexBus
3 = CM4-TCM backdoor port
4 = QuadSPI0
5 = OCRAM0_sys
6 = OCRAM1_sys
7 = OCRAM2_gfx
9 = QuadSPI1
11 = DDR0 | DDR1
and in this chapter , it is written
In addition to the TZENR register bits, there is a single device fuse bit that provides a further level of
qualification. This fuse signal is combined with the individual TZENi bits to form the fully qualified
TZASC enable for each instance:
qualified_TZENi = MSCM_TZENR[i] & tzenb_fuse
where tzenb_fuse serves as a global enable qualifier.
My issue :
When I try to enable ( set bit 6 & 7) TZASC module for OCRAM and just after I read these bist then I read always 0
So When I read the equation qualified_TZENi = MSCM_TZENR[i] & tzenb_fuse ,, if tzenb_fuse=0 then I read always 0
But If I search the bit tzenb_fuse in TRM , I don't find it
Somebody , tell me where can I find this bit ? What is it his default value and how can I modify this field
Somebody , tell me how can I enable the module TZASC for OCRAM ?