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• The MDASM is connected to four 16-bit counter buses available to that submodule
instance, so that the MDASM can select by software which one to use.
• The MDASM uses the request bus to transmit the FLAG line to the interrupt request
submodule (MIRSM).
17.9.7
Effect of RESET on MDASM
When the reset signal is asserted, the MDASM registers are reset according to the values
specified in Section 17.9.8, "MDASM Registers."
17.9.8
MDASM Registers
The privilege level to access the MDASM registers depends on the MIOS14MCR SUPV
bit. The privilege level is unrestricted after reset and can be changed to supervisor by
software.
17.9.8.1 MDASM Registers Organization
The MDASM register map comprises four 16-bit register locations. As shown in below, the
register block contains four MDASM registers. Note that the MDASMSCRD is the
duplication of the MDASMSCR. This is done to allow 32-bit aligned accesses.
The user should not write directly to the address of the
MDASMSCRD. This register's address may be reserved for
future use and should not be accessed by the software to ensure
future software compatibility.
All unused bits return zero when read by the software. All register addresses in this section
are specified as offsets from the base address of the MDASM.
Address
0x30 6058 MDASM11 Data A Register (MDASMAR)
0x30 605A MDASM11 Data B Register (MDASMBR)
0x30 605C MDASM11 Status/Control Register Duplicated (MDASMSCRD)
0x30 605E MDASM11 Status/Control Register (MDASMSCR)
MOTOROLA
Chapter 17. Modular Input/Output Subsystem (MIOS14)
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
WARNING
Table 17-19. MDASM Address Map
MDASM11
See Section 17.9.8.2, "MDASM Data A (MDASMAR) Register" for bit
descriptions.
See Section 17.9.8.3, "MDASM Data B (MDASMBR) Register" for bit
descriptions.
See Table 17-22 for bit descriptions.
See Table 17-22 for bit descriptions.
MIOS14 Double Action Submodule (MDASM)
Register
17-39
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