Static memory controller
154
NS9750 Hardware Reference
Byte lane control and databus steering

For little and big endian configurations, address right-justified

The tables in this section (Table79 through Table 125) show the relationship of

signals HSIZE[2:0], HADDR[1:0], ADDROUT[1:0], and BLSOUT[3:0] and mapping of data

between the AHB system databus and the external memory databus. This mapping

applies to both the static and dynamic memory controllers.

Access: Read, little endian, 8-bit external
bus External data mapping on to system
databus
Internal
transfer
width HRDATA to DATA
HSIZE
[2:0] HADDR
[1:0] ADDROUT
[1:0] BLSOU
T [0] [31:24] 23:16] [15:8] [7:0]
Word (4
transfers) 010 -- 11
10
01
00
0
0
0
0
[7:0]
-
-
-
-
[7:0]
-
-
-
-
[7:0]
-
-
-
-
[7:0]
Halfword (2
transfers) 001 1- 11
10
0
0
[7:0]
-
-
[7:0]
-
-
-
-
Halfword (2
transfers) 001 0- 01
00
0
0
-
-
-
-
[7:0]
-
-
[7:0]
Byte 000 11 11 0 [7:0] - - -
Byte 000 10 10 0 - [7:0] - -
Byte 000 01 01 0 - - [7:0] -
Byte0000000 0---[7:0]

Table 79: Little endian read, 8-bit external bus