Address Multiplexing Format - Fujitsu FR60 Hardware Manual

4.9.4

Address Multiplexing Format

This section describes the address multiplexing format.
■ Address Multiplexing Format
SDRAM/FCRAM access addresses correspond to row, bank, and column addresses differently
depending on the settings of the ASZ3 to ASZ0, DBW1 and DBW0, PSZ2 to PSZ0, and BANK
bits.
Addresses are arranged in the order of Column, BANK, and Row addresses, starting from the
least significant bit.
Set each bit as shown below.
• ASZ3 to ASZ0 bits:
• DBW1 and DBW0 bits: Set these bits to the data bus width. (Set the bits to "16 bits" for
• PSZ2 to PSZ0 bits:
• BANK bit:
Figure 4.9-6 shows examples of combinations of access addresses and Row/BANK/Column
addresses.
Figure 4.9-6 Examples of Combinations of access Addresses and Row/BANK/Column Addresses
4M bytes (set ASZ to
256 column (set PSZ to
Access address bit
16M bytes (set ASZ to
512 column (set PSZ to
Access address bit
64M bytes (set ASZ to
512 column (set PSZ to
Access address bit
Set these bits to the total amount of SDRAM/FCRAM connected to
the corresponding area. For using two modules in parallel, set the
total amount. Affects the number of row addresses.
connecting a pair of eight-bit modules in parallel.) Column
addresses are shifted according to the data bus width setting. 8 bits:
Do not shift. 16 bits: Shift one bit. 32 bits: Shift two bits.
Set these bits to the number of column addresses used for SDRAM/
FCRAM.
Set this bit to the number of SDRAM/FCRAM bank addresses.
" "
0110 ), 8-bit bus width (set DBW to "00
B
" "
000 ), 2 banks (set BANK to
B
22 21
31
External address pin
A12
A14
" "
1000 ), 16-bit bus width (set DBW to
B
" "
001 ), 4 banks (set BANK to
B
24 23
31
External address pin
A15 A14
" "
1010 ), 32-bit bus width (set DBW to
B
" "
001 ), 4 banks (set BANK to
B
26 25
31
External address pin
A15 A14 A12
CHAPTER 4 EXTERNAL BUS INTERFACE
")
B
" "
0 )
9 8 7
ROW COLUMN
BA
A11 A10 A9 A8 A7 A6 A5 A4 A3 A2
" "
01 )
B
" "
1 )
12 1110 9
BA
ROW COLUMN
A11 A10 A9 A8 A7 A6 A5 A4 A3 A2
" "
10 )
B
" "
1 )
13 12 1110
BA
ROW
COLUMN
A11 A10 A9 A8 A7 A6 A5 A4 A3 A2
0
A1 A0
1 0
A1 A0
2 1 0
A1 A0
231