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External Bus Interface (EBI)
MPC5566 Microcontroller Reference Manual, Rev. 2
12-12
Freescale Semiconductor
12.2.2
Signal Function and Direction by Mode
The EBI operating mode is configured using two fields in the EBI Master Control register (EBI_MCR):
EXTM and MDIS. Their settings determine which EBI signals are valid and the I/O direction. When the
a signal is configured for non-EBI function in the EBI_MCR, the EBI always negates the signal if the EBI
controls the corresponding pad (determined by SIU configuration).
lists the function and
direction of the external signals in each of the EBI modes of operation. The clock signals are not included
because they are output only (from the FMPLL module) and are not affected by EBI modes. See
Section 12.3.1.3, “EBI Module Configuration Register (EBI_MCR)
” for details on the EXTM and MDIS
bits.
Table 12-5. Signal Function According to EBI Mode Settings
Signal Function
EBI Modes
Module Disable Mode
EXTM =
n
, MDIS = 1
Single Master Mode
I/O Direction
EXTM = 0, MDIS = 0
External Master Mode
I/O Direction
EXTM = 1, MDIS = 0
ADDR[6:11]
1
non-EBI function
Address bus (output)
Address bus (I/O)
2
ADDR[12:30]
non-EBI function
Address bus (output)
Address bus (I/O)
BDIP
non-EBI function
Burst data in progress (output)
3
CS[0:3]
non-EBI function
Chip selects (output)
DATA[0:31]
4
non-EBI function
Data bus (I/O)
OE
non-EBI function
Output enable (output)
RD_WR
non-EBI function
Read/write (output)
Read/write (I/O)
TA
non-EBI function
Transfer acknowledge (I/O)
TEA
non-EBI function
Transfer Error Acknowledge (I/O)
TS
non-EBI function
Transfer start (output)
Transfer start (I/O)
WE/BE[0:3]
non-EBI function
Write/byte enables (output)
CAL_CS[0:3]
5
non-EBI function
Chip selects (output) for the 416 package
CAL_ADDR[12:30]
non-EBI function
Calibrate the address bus (output)
CAL_DATA[0:15]
non-EBI function
Calibrate the data bus (I/O)
CAL_OE
non-EBI function
Calibrate the bus to enable output
non-EBI function
Calibrate the transfer start (output)
CAL_WE/BE[0:1]
non-EBI function
Calibrate the write/byte enables (output)
BB
non-EBI function
Non-EBI function
Bus Busy (I/O)
BG
non-EBI function
Non-EBI function
Bus Grant (I/O)
BR
non-EBI function
Non-EBI function
Bus Request (I/O)
TSIZ[0:1]
non-EBI function
Transfer Size (Output)
Transfer Size (I/O)
Содержание MPC5566
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