External Bus Interface (EBI)
MPC5644A Microcontroller Reference Manual, Rev. 6
286
Freescale Semiconductor
14.4.1.1
EBI Module Configuration Register (EBI_MCR)
Figure 14-2. EBI Module Configuration Register (EBI_MCR)
The EBI Module Configuration Register contains bits which configure various attributes associated with
EBI operation.
E0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
RESET:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
AC
GE
0
0
0
0
0
0
0
0
MDI
S
0
0
0
D16_
31
AD_MUX
DB
M
W
RESET:
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
1
= Unimplemented or Reserved
Table 14-5. EBI Module Configuration Register (EBI_MCR) Field Descriptions
Name
Description
16
ACGE
ACGE - Automatic CLKOUT Gating Enable
The ACGE bit enables the EBI feature of turning off CLKOUT (holding it high) during idle periods
in-between external bus accesses.
1: Automatic CLKOUT Gating is enabled
0: Automatic CLKOUT Gating is disabled
25
MDIS
MDIS — Module Disable Mode
The MDIS bit controls an internal EBI “enable clk” signal which can be used (if MCU logic supports)
to control the clocks to the EBI. The MDIS bit allows the clock to be stopped to the non-memory
mapped logic in the EBI, effectively putting the EBI in a software controlled power-saving state. See
Section 14.2.3.2, Module disable mode
for more information. No external bus accesses can be
performed when the EBI is in Module Disable Mode (MDIS=1).
1: Module Disable Mode is active (negate “enable clk” signal)
0: Module Disable Mode is inactive (assert “enable clk” signal)
29
D16_31
D16_31 — Data Bus 16_31 Select
The D16_31 bit controls whether the EBI uses the DATA[0:15] or DATA[16:31] signals, when in
16-bit Data Bus Mode (DBM=1) or for chip-select accesses to a 16-bit port (PS=1). For systems
using A/D muxing with a 16-bit port, it is recommended to set D16_31 to 1.
1: DATA[16:31] signals are used for 16-bit port accesses
0: DATA[0:15] signals are used for 16-bit port accesses
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