Digi NS9750 User Manual
Page 185
w w w . d i g i e m b e d d e d . c o m
1 6 1
M e m o r y C o n t r o l l e r
Access: Write, big endian, 16-bit
external bus
System data mapping on to external
databus
Internal
transfer
width
DATA to HRDATA
HSIZE
[2:0]
HADD
R [1:0]
ADDROUT
[1:0]
BLSOU
T [1:0]
[31:24]
[23:16]
[15:8]
[7:0]
Word (2
transfers
010
--
1-
0-
00
00
--
-
-
-
[15:8][3
1:24]
[7:0]
[23:16]
Halfword
001
1-
1-
00
-
-
[15:8]
[7:0]
Halfword
001
0-
0-
00
-
-
[31:24]
[23:16]
Byte
000
11
1-
10
-
-
-
[7:0]
Byte
000
10
1-
01
-
-
[15:8]
-
Byte
000
01
0-
10
-
-
-
[23:16]
Byte
000
00
0-
01
-
-
[31:24]
-
Table 89: Big endian write, 16-bit external bus
Access: Write, big endian, 32-bit
external bus
System data mapping on to external
databus
Internal
transfer
width
DATA
HSIZE
[2:0]
HADDR
[1:0]
BLSOUT
[3:0]
[31:24]
[23:16]
[15:8]
[7:0]
Word
010
--
0000
[31:24]
[23:16]
[15:8]
[7:0]
Halfword
001
1-
1100
-
-
[15:8]
[7:0]
Halfword 001
0-
0011
[31:24]
[23:16]
-
-
Byte
000
11
1110
-
-
-
[7:0]
Byte
000
10
1101
-
-
[15:8]
-
Table 90: Big endian write, 32-bit external bus