Ip_A, Ip_B, Ip_C, Ip_D Memory Size - Motorola MVME162FX Programmer's Reference Manual

IP2 Chipming Model
IP_a, IP_b, IP_c, IP_d Memory Size Registers
ADR/SIZ
4
BIT
NAME($0C)
NAME($0D)
NAME($0E)
NAME($0F)
OPER
RESET
4-22
As with the memory base address registers, the IP_a size register is
also used to control accesses to double size IP_ab and the IP_c size
register is used to control accesses to double size IP_cd.
$FFFBC00C through $FFFBC00F (8 bits each)
7 6
a_SIZE23 a_SIZE22
b_SIZE23 b_SIZE22
c_SIZE23 c_SIZE22
d_SIZE23 d_SIZE22
R/W R/W
0 R 0 R
SIZE23-16 A, 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
23 22 21 20 19 18 17 16
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 1
0 0 0 1 1
0 0 1 1 1
0 1 1 1 1
1 1 1 1 1
Note that 16MB is only possible using a double size IP.
5 4 3
a_SIZE21 a_SIZE20 a_SIZE19
b_SIZE21 b_SIZE20 b_SIZE19
c_SIZE21 c_SIZE20 c_SIZE19
d_SIZE21 d_SIZE20 d_SIZE19
R/W R/W R/W
0 R 0 R 0 R
Address Lines
that Are
Compared
0 0 0 A31-A16
0 0 1 A31-A17
0 1 1 A31-A18
1 1 1 A31-A19
1 1 1 A31-A20
1 1 1 A31-A21
1 1 1 A31-A22
1 1 1 A31-A23
1 1 1 A31-A24
2 1 0
a_SIZE18 a_SIZE17 a_SIZE16
b_SIZE18 b_SIZE17 b_SIZE16
c_SIZE18 c_SIZE17 c_SIZE16
d_SIZE18 d_SIZE17 d_SIZE16
R/W R/W R/W
0 R 0 R 0 R
Resulting
Memory Size
64KB
128KB
256KB
512KB
1MB
2MB
4MB
8MB
16MB