4

IP2 Chip

ADR/SIZ

 

$FFFBC00C through $FFFBC00F (8 bits each)

 

 

 

 

 

 

 

 

 

 

 

 

BIT

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

NAME($0C)

a_SIZE23

a_SIZE22

a_SIZE21

a_SIZE20

a_SIZE19

a_SIZE18

a_SIZE17

a_SIZE16

 

 

 

 

 

 

 

 

 

 

NAME($0D)

b_SIZE23

b_SIZE22

b_SIZE21

b_SIZE20

b_SIZE19

b_SIZE18

b_SIZE17

b_SIZE16

 

 

 

 

 

 

 

 

 

NAME($0E)

c_SIZE23

c_SIZE22

c_SIZE21

c_SIZE20

c_SIZE19

c_SIZE18

c_SIZE17

c_SIZE16

 

 

 

 

 

 

 

 

 

NAME($0F)

d_SIZE23

d_SIZE22

d_SIZE21

d_SIZE20

d_SIZE19

d_SIZE18

d_SIZE17

d_SIZE16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OPER

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

 

 

 

 

 

 

 

 

 

RESET

0 R

0 R

0 R

0 R

0 R

0 R

0 R

0 R

 

 

 

 

 

 

 

 

 

 

SIZE23-16A, B, C, D SIZE should be programmed to match the size of the corresponding IndustryPack memory space. The IP2 chip performs its IndustryPack memory sizing by masking any bit in BASE23-BASE16 whose corresponding SIZE23-SIZE16 bit is set. The following table shows this. Note that only certain combinations of the SIZE bits (those shown in the table) make sense. Any other combination of the SIZE bits yields unpredictable results.

 

 

 

Size Bits

 

 

 

Address Lines

Resulting

 

 

 

 

 

 

 

 

that Are

23

22

21

20

19

18

17

16

Memory Size

Compared

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

0

0

0

0

0

0

0

A31-A16

64KB

 

 

 

 

 

 

 

 

 

 

0

0

0

0

0

0

0

1

A31-A17

128KB

 

 

 

 

 

 

 

 

 

 

0

0

0

0

0

0

1

1

A31-A18

256KB

 

 

 

 

 

 

 

 

 

 

0

0

0

0

0

1

1

1

A31-A19

512KB

 

 

 

 

 

 

 

 

 

 

0

0

0

0

1

1

1

1

A31-A20

1MB

 

 

 

 

 

 

 

 

 

 

0

0

0

1

1

1

1

1

A31-A21

2MB

 

 

 

 

 

 

 

 

 

 

0

0

1

1

1

1

1

1

A31-A22

4MB

 

 

 

 

 

 

 

 

 

 

0

1

1

1

1

1

1

1

A31-A23

8MB

 

 

 

 

 

 

 

 

 

 

1

1

1

1

1

1

1

1

A31-A24

16MB

 

 

 

 

 

 

 

 

 

 

Note that 16MB is only possible using a double size IP.

4-22

Computer Group Literature Center Web Site

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Image 258
Motorola MVME172 manual BIT NAME$0C