3.9.2 BP141_TZMA

PrimeCell Infrastructure AMBA 3 AXI TrustZone Memory Adapter. This model is written in LISA+.

BP141_TZMA contains the following CADI targets:

  • BP141_TZMA
  • PVBusRange
  • TZSwitch

BP141_TZMA contains the following MTI components:

About BP141_TZMA

BP141_TZMA permits a single physical memory cell of up to 2MB to be shared between a secure and non-secure storage area. The partitioning between these areas is flexible.

This component routes transactions according to the following:

  • The memory region that they are attempting to access.
  • The security mode of the transaction.

The BP141_TZMA fixes the base address of the secure region to the base address of the decode space. It uses the R0SIZE[9:0] input to configure the size of the secure region in 4KB increments up to a maximum of 2MB.

TZMEMSIZE is the maximum addressing range of the memory as defined by that parameter. By default, TZMEMSIZE is set to 2MB. In the following table, AxADDR is the offset address that the transactions want to access.

Table 3-288 BP141_TZMA security control

AxADDR Memory Region Non-secure Transfer Secure Transfer
AxADDR < R0Size Secure, R0 Illegal Legal
R0SIZE <= AxADDR and AxADDR < TZMEMSIZE Non-secure, R1 Legal Legal
AxADDR => TZMEMSIZE No access Illegal Illegal

Table 3-289 Ports

Name Protocol Type Description
R0Size Value Slave A software interface that is driven from the TrustZone Protection Controller (TZPC), setting the secure region size by bits[9:0].
pv_output PVBus Master Routed PVBus output
pvbus PVBus Slave Bus slave interface.

Table 3-290 Parameters for PVBusRange

Name Type Default value Description
pvbusrange_0.range int 0x0 Addressable range routed to pvbus_port_a

Table 3-291 Parameters for TZSwitch

Name Type Default value Description
normal int 0x2 Normal Port
secure int 0x1 Secure Port

Table 3-292 Parameters for BP141_TZMA

Name Type Default value Description
TZMEMSIZE int 0x200000 Addressable range of device
TZSECROMSIZE int 0x200 Default secure size
TZSEGSIZE int 0x1000 Segment size
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