MB86831 FUJITSU [Fujitsu Component Limited.], MB86831 Datasheet - Page 12

• Manufacturer Part Number: MB86831
• Description: 32-bit Embedded Controller
• Manufacturer: FUJITSU [Fujitsu Component Limited.]

12
MB86830 Series
(Continued)
BE0#
BE1#
BE2#
BE3#
CS0#
CS1#
CS2#
CS3#
CS4#
CS5#
Symbol
BYTE ENABLE
CHIP SELECT
Pin name
I/O
I/O
O
O
O
O
Chip select signals.
These chip select signals are asserted when the Address Range Spec-
ifier Register (ARSR) and Address Mask Register (AMR) is accessed
with the CS Enable bit (bit 4) in the System Support Control Register
(SSCR) set to “1.” (Note, however, that only the CS0# pin is indepen-
dent of the CS Enable bit.)
(Continued)
* : The mark such as (D<31:24>) shows the bit of the data bus used.
Width of
16-bits
bus
Width of
8-bits
bus
Width of
bus
Write
Read
Write
Read
Word (D<15:0>) access-0
Word (D<15:0> )access-1
Half word-0 (D<15:0>)
Half word-1 (D<15:0>)
Half word-0 access-1
Half word-0 access-0
Half word-1 access-0
Half word-1 access-1
Access type
Byte-0 (D<15:8>)
Byte-2 (D<15:8>)
Byte-1 (D<7:0>)
Byte-3 (D<7:0>)
word access-0
word access-1
word access-2
word access-3
Access-0
Access-1
Access-0
Access-1
Access-2
Access-3
Byte-0
Byte-1
Byte-2
Byte-3
Function
BE0#
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
1
0
1
0
0
0
0
0
0
0
BE1#
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
1
0
1
0
0
0
0
0
0
BE2#
(Continued)
0
0
1
1
0
1
1
0
0
1
0
0
1
1
0
0
1
1
1
1
0
0
0
0
1
1
BE3#
0
0
0
0
0
0
0
0
0
0
0
1
0
1
1
0
1
0
1
0
1
0
0
1
0
1