External Bus Interface (EBI)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
29-8
Freescale Semiconductor
Preliminary
29.2.3
Signal Pad Configuration by Mode
Depending on the mode of operation, many external signals must have their pads configured to operate as
push/pull signals for correct system operation. This configuration is done in the system integration unit
(SIU) module.
The open drain mode of the pads configuration module is not used for any EBI signals.
shows how each EBI signal must have its pad configured prior to operating in each of the EBI
modes. See
Section 29.3.2.3, “EBI Module Configuration Register (EBI_MCR)
and MDIS bits.
29.3
Memory Map and Registers
This section provides a detailed description of all EBI registers.
29.3.1
Module Memory Map
The EBI memory map is shown in
. The address of each register is given as an offset to the EBI
base address. Registers are listed in address order, identified by complete name and mnemonic, and lists
the type of accesses allowed.
1
Although external master accesses can drive these pins, the EBI tri-states the pins and does not sample
them for input.
Table 29-2. Required EBI Pad Configuration by Mode
Signal Name
Module Disable Mode
1
(EXTM = X, MDIS = 1)
1
X indicates the pad configuration is a don’t care because the signal is not used by the EBI in this mode.
Single Master Mode
(EXTM = 0, MDIS = 0)
External Master Mode
(EXTM = 1, MDIS = 0)
BDIP
X
Push/Pull
Not supported
CS[0:3]
X
Push/Pull
AD[0:31]
X
Push/Pull,
Three-stateable
ADDR[8:15]
X
Push/Pull
OE
X
Push/Pull
RD_WR
X
Push/Pull
TA
X
Push/Pull,
Three-stateable
TEA
X
Push/Pull,
Three-stateable
TS
X
Push/Pull
ALE
X
Push/Pull
WE[0:3]
X
Push/Pull