Rev. 2.00, 09/03, page 152 of 690
Name
I/O
Function
CKE
O
Connects to CKE pin when SDRAM is connected.
AH
O
Holds the address in address/data multiplex I/O mode.
WAIT
I
External wait input
BREQ
I
Bus request input
BACK
O
Bus acknowledge output
MD3, MD4
I
Area 0 bus width (8/16/32 bits)
MD5
I
Specifies endian
0: Big endian
1: Little endian
7.3
Area Overview
In the architecture of this LSI, both logical spaces and physical spaces have 32-bit address spaces.
The cache access method is shown by the upper 3 bits. For details see section 4, Cache. The
remaining 29 bits are used for division of the space into eight areas. The BSC performs control for
this 29-bit space.
As listed in table 7.2, this LSI can be connected directly to eight areas of memory, and it outputs
chip select signals (
CS0, CS2 to CS4, CS5A, CS5B, CS6A, and CS6B) for each of them. CS0 is
asserted during area 0 access;
CS5B is asserted during area 5B access. When an SDRAM is
connected to area 2 or area 3,
RASU, RASL, CASU, CASL, DQMUU, DQMUL, DQMLU, and
DQMLL are asserted.
7.3.1
Address Map
The external address space has a capacity of 384 Mbytes and is used by dividing 8 partial spaces.
The kind of memory to be connected and the data bus width are specified in each partial space.
The address map for the external address space is listed below.
Table 7.2
Physical Address Space Map
Area
Memory to be
Connected
Physical Address
Capacity
Access
Size
H'00000000
to H'03FFFFFF
64 Mbytes 8, 16, 32
*
2
Area 0
Normal memory
*
1
,
Burst ROM
H'00000000
to H'03FFFFFF
+
H'20000000
×
n
+
H'20000000
×
n
Shadow
(n: 1 to 6)
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