NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
- 267 -
Revision V1.30
NUC97
0
T
E
CHNIC
A
L
RE
F
E
RE
N
CE
MA
NUA
L
[24]
EXBE0
External Bus Bank 0 Byte Enable
This bit and M68E0(EBI_CTL[19]) defines how the pins EBI_nBE1, EBI_nBE0 and EBI_nWE
are used when external bus bank 0 accessed.
Please refer to the table shown below for detail information.
EXBE0
M68E0
Description
0
0
80-type interface. Pin EBI_nBE1 and EBI_nBE0 used as
byte write strobe signal.
1
0
80-type interface. Pin EBI_nBE1 and EBI_nBE0 used as
byte enable signals while EBI_nWE used as write strobe
signal to external device.
0
1
68-type interface. EBI_nCS0 pin is the enable signal,
EBI_nWE used as read/write strobe signal
1
1
Reserved
[23]
M68E4
External Bus Bank 4 M68 Mode Enable
This bit and EXBE4 (EBI_CTL[28]) defines how the pins EBI_nBE1, EBI_nBE0 and
EBI_nWE are used when external bus bank 4 accessed.
Please refer to the description of EXBE4 (EBI_CTL[28]) for detail information.
[22]
M68E3
External Bus Bank 3 M68 Mode Enable
This bit and EXBE3 (EBI_CTL[27]) defines how the pins EBI_nBE1, EBI_nBE0 and
EBI_nWE are used when external bus bank 3 accessed.
Please refer to the description of EXBE3 (EBI_CTL[27]) for detail information.
[21]
M68E2
External Bus Bank 2 M68 Mode Enable
This bit and EXBE2 (EBI_CTL[26]) defines how the pins EBI_nBE1, EBI_nBE0 and
EBI_nWE are used when external bus bank 2 accessed.
Please refer to the description of EXBE3 (EBI_CTL[26]) for detail information.
[20]
M68E1
External Bus Bank 1 M68 Mode Enable
This bit and EXBE1 (EBI_CTL[25]) defines how the pins EBI_nBE1, EBI_nBE0 and
EBI_nWE are used when external bus bank 1 accessed.
Please refer to the description of EXBE1 (EBI_CTL[25]) for detail information.
[19]
M68E0
External Bus Bank 0 M68 Mode Enable
This bit and EXBE0 (EBI_CTL[24]) defines how the pins EBI_nBE1, EBI_nBE0 and
EBI_nWE are used when external bus bank 0 accessed.
Please refer to the description of EXBE0 (EBI_CTL[24]) for detail information.
[18:3]
Reserved
Reserved.
[2:1]
WAITVT
Valid Time of EBI_NWAIT Signal
This bit recognizes the EBI_n
WAIT signal at the next “nth” MCLK rising edge after the nOE
or nWBE active cycle. WAITVT bits determine the n.
00 = 1 MCLK cycle.
01 = 2 MCLK cycle.
10 = 3 MCLK cycle.
11 = 4 MCLK cycle.
[0]
LITTLE
Little Endian Mode
This bit is read only and always read as 1.