NEC µPD72257 Preliminary User's Manual page 316

Chapter 9
Bit Bit name
ROWADDRW
8 to 5
[3:0]
4 to 3 BKADDRW[1:0]
316
Function
all other prohibited
Number of address bits for row address
0111
8 bit
B
1000
9 bit
B
1001
10 bit
B
1010
11 bit (default)
B
1011
12 bit
B
1100
13 bit
B
all other prohibited
Number of bank address bits
00
1 bit, i.e. 2 banks
B
01
2 bit, i.e. 4 banks (default)
B
all other prohibited
Preliminary User's Manual S19203EE1V3UM00
External Memory Interface Controller