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TC1784
LMB External Bus Unit
User´s Manual
12-8
V1.1, 2011-05
EBUT13L-A, V1.16
Of these only EBU_MODCON.ARBMODE has any effect in the implementation. The
others must be left at default values.
12.4.1
Arbitration Modes
The arbitration mode of the memory controller can be selected programming the
EBU_MODCON.ARBMODE bit field (see
) after reset. Four different modes
are available:
•
No Bus Mode
•
Sole Master Mode
•
Arbiter Mode (reserved, do not use)
•
Participant Mode (reserved, do not use)
12.4.1.1 No Bus Arbitration Mode
All accesses of the EBU to devices on the external bus are prohibited and will generate
a LMB bus error.
No Bus Mode is selected by EBU_MODCON.ARBMODE = 00
B
.
Note: The EBU can be configured for optimal power saving by entering standby mode
(EBU_CLC.DISR=1
B
) once ARBMODE has been set to 00
B
.
12.4.1.2 Sole Master Arbitration Mode
The EBU has access to the external bus at any time.
Sole Master Mode is selected by EBU_MODCON.ARBMODE = 11
B
.
Table 12-6
External Bus Arbitration Programmable Parameters
Parameter
Function
Description
see
EBU_MODCON.ARBMODE
Arbitration mode selection
EBU_MODCON.ARBSYNC
Arbitration input signal sampling control
EBU_MODCON.EXTLOCK
External bus ownership locking control
EBU_MODCON.TIMEOUTC External bus time-out control
Содержание TC1784
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