Fast Models Reference Manual - ARM Information Center

Peripheral and Interface Components
Parameters
Table 5-114 provides a description of the configuration parameters for the MessageBox
component.
Table 5-114 MessageBox configuration parameters
Parameter name Description Type
Allowed
value
Default
value
id MessageBox ID Integer - 0x01400400
Registers
Table 5-115 provides a description of the configuration registers for the MessageBox
component.
Table 5-115 MessageBox registers
Register name Offset Access Description
MESSAGEBOX_ID 0x00 read only Returns a user-configurable
ID value.
MESSAGEBOX_DATA 0x04 read/write See DATA register.
MESSAGEBOX_CONTROL 0x08 read/write See CONTROL register.
MESSAGEBOX_STATUS 0x0C read only See STATUS signal bits on
page 5-140.
MESSAGEBOX_START 0x10 read/write See START register on
page 5-140.
MESSAGEBOX_END 0x14 read/write See END register on
page 5-140.
MESSAGEBOX_IRQMASK 0x18 read/write Controls which of the status
bits can cause the interrupt
signal to be asserted.
DATA register
Writing to the DATA register writes to the buffer at the offset specified in the END register, and
increments the register by 4.
Reading from the register reads from the buffer at the offset specified in the START register, and
increments the register by 4.
CONTROL register
The CONTROL register issues commands to control message passing. The register can be
programmed with one of two values:
1 Causes the START/END registers to be reset to 0 and clears the RXREADY bit
in the STATUS register. This can also be done directly by programming the
START/END registers to 0.
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