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Chapter 4
Bus Control Function
Preliminary User’s Manual U15839EE1V0UM00
4.3.1 Chip Select Control Function
The 64 MB memory area can be divided into 2 MB, 4 MB and 8 MB memory blocks by the chip area
selection control registers 0 and 1 (CSC0, CSC1) to control the chip select signals.
The memory area can be effectively used by dividing the memory area into memory blocks using the
chip select control function. The priority order is described below.
(1)
Chip area selection control registers 0, 1(CSC0, CSC1)
These registers can be read/written in 16-bit units. Valid by setting each bit (to 1). If different chip
area select signals are set to the same block, the priority order is controlled as follows.
CSC0: Peripheral I/O area > CS0 > CS2 > CS1 > CS3
Note
CSC1: Peripheral I/O area > CS7 > CS5 > CS6 > CS4
Note
Notes: 1. Not all the chip area select signals are externally available on output pins. Even so, enabling
chip area select signals other than CS0, CS3 or CS4, the setting for the corresponding
memory blocks will be effective too, regardless of an external chip select output pin.
2. After reset Jupiter fetches the boot vector from CS0 area.
Figure 4-2:
Chip Area Select Control Registers 0, 1 (1/2)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Address
Initial
value
CSC0 CS33 CS32 CS31 CS30 CS23 CS22 CS21 CS20 CS13 CS12 CS11 CS10 CS03 CS02 CS01 CS00 3FFFFF060H 2C11H
CS3
CS2
CS1
CS0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Address
Initial
value
CSC1 CS43 CS42 CS41 CS40 CS53 CS52 CS51 CS50 CS63 CS62 CS61 CS60 CS73 CS72 CS71 CS70 3FFFFF062H 2C11H
CS4
CS5
CS6
CS7
Summary of Contents for mPD703128
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