Dts Register Access - STMicroelectronics SPC572L series Reference Manual

RM0400
64.3.1

DTS register access

A summary of accesses to all DTS registers by bus masters is provided in
proper 32-bit accesses are valid. The effects of write accesses that are not 32 bits are not
defined.
Register
DTS_ENABLE
DTS_STARTUP
DTS_SEMAPHORE
DTS_SEMAPHORE_B
1. Nexus Read/Write access via an external tool
2. FlexRay or other master
3. A read of the semaphore registers by Nexus Read/Write Access module is destructive and clears all bits in the register
Access to DTS module registers is controlled based on the XBAR Master ID of the
accessing module.
Note: The XBAR Master ID should not be confused with the Master Port number of the XBAR.
See Chapter 14: Crossbar Switch
Tools must access the DTS registers through the Nexus Read/Write Access mechanism of a
core. External tool accesses through either core appear as if the access is via the core and
therefore do not have the same level of access as a Nexus Read/Write Access.
64.4 Memory map and register definition
Table 1044
Offset
0x0 ENABLE—DTS Output Enable Register
0x4 STARTUP—DTS Startup Register
0x8 SEMAPHORE—DTS Semaphore Register
SEMAPHORE_B—DTS Semaphore
0xC
Extension
1. Only certain types of accesses are allowed. See the register figure note of each register for a description of the accesses
that are allowed.
Table 1043. DTS register access effects
32-bit read
(1)
RWA Core
Data Data
Data Data
Data and
Data
(3)
Clear
Data and
Data
3
Clear
shows the memory map of the DTS module registers.
Table 1044. DTS memory map
Register
DocID027809 Rev 4
Development Trigger Semaphore (DTS)
FlexRay
eDMA RWA
(2)
Data Data Data
Data Data Data
Data Data No effect
Data Data No effect
(XBAR), for details.
Access
Restricted
R/W
Restricted
R/W
Restricted
R/W
Restricted
R/W
Table
32-bit write
1
Core eDMA
No effect No effect No effect
No effect No effect No effect
Bit OR Bit OR
Bit OR Bit OR
Reset Value
0x0000_0000
(1)
0x0000_0000
1
0xFFFF_FFFF
1
0xFFFF_FFFF
1
1043. Only
2
FlexRay
No effect
No effect
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64.4.1.2/1868
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