International Computer Hardware User Manual

Address decoding
262 NS9750 Hardware Reference
The internal registers, unlike system memory, can be accessed only in privileged
access mode. Privileged access mode is indicated when
HPROT[1] is active high.
Table 167 shows the
hmaster[3:0] assignments for NS9750.
0xA010 0000 – 0xA01F FFFF 1 MB PCI CONFIG_ADDR
0xA020 0000 – 0xA02F FFFF 1 MB PCI CONFIG_DATA
0xA030 0000 – 0xA03F FFFF 1 MB PCI arbiter
0xA040 0000 – 0xA04F FFFF 1 MB BBUS-to-AHB bridge
0xA050 0000 – 0xA05F FFFF 1 MB Reserved
0xA060 0000 – 0xA06F FFFF 1 MB Ethernet Communication Module
0xA070 0000 – 0xA07F FFFF 1 MB Memory controller
0xA080 0000 – 0xA08F FFFF 1 MB LCD controller
0xA090 0000 – 0xA09F FFFF 1 MB System Control Module
0xA0A0 0000 – 0xFFFF FFFF 1526 Reserved
Master Name hmaster[3:0] assignment
ARM926 I/D 0000
Ethernet Rx 0001
Ethernet Tx 0010
Reserved 0011
PCI 0100
BBus 0101
LCD 0110
Table 167: Hmaster encoding
Address range Size System functions
Table 166: System address map