Sharp LH79524 User Manual page 265

External Memory Controller
DYNCFGx BITS
[14] [12]
32-BIT EXTERNAL BUS LOW POWER SDRAM ADDRESS MAPPING (ROW, BANK, COLUMN)
1
1
1
1
1
1
1
1
1
1
1
1
1
NOTES:
1. A Chip Select can be connected to a single memory device, in this case the Chip Select data bus width is
the same as the device width. Alternatively the Chip Select can be connected to a number of external
devices. In this case the Chip Select data bus width is the sum of the memory device data bus widths. For
example, for a Chip Select connected to:
– a 32-bit wide memory device, choose a 32-bit wide address mapping.
– a 16-bit wide memory device, choose a 16-bit wide address mapping.
– four x 8-bit wide memory devices, choose a 32-bit wide address mapping.
– two x 8-bit wide memory devices, choose a 16-bit wide address mapping.
2. The SDRAM column and row width and number of banks are computed automatically from the
address mapping.
3. The SDRAM section of the memory controller does a constant burst of 8 when configured to access 16 bit
memory devices. Similarly, it does burst of 4 when configured to access 32-bit memory devices.
7-50
Table 7-49. Address Mapping (Cont'd)
[11:9] [8:7]
16Mb (2M × 8), 2 banks, row length = 11, column length = 9
1 000 00
16Mb (1M × 16), 2 banks, row length = 11, column length = 8
1 000 01
64Mb (8M × 8), 4 banks, row length = 12, column length = 9
1 001 00
64Mb (4M × 16), 4 banks, row length = 12, column length = 8
1 001 01
64Mb (4M × 16), 4 banks, row length = 11, column length = 8
1 001 10
128Mb (16M × 8), 4 banks, row length = 12, column length = 10
1 010 00
128Mb (8M × 16), 4 banks, row length = 12, column length = 9
1 010 01
128Mb (8M × 16), 4 banks, row length = 12, column length = 8
1 010 10
256Mb (32M × 8), 4 banks, row length = 13, column length = 10
1 011 00
256Mb (16M × 16), 4 banks, row length = 13, column length = 9
1 011 01
256Mb (16M × 16), 4 banks, row length = 13, column length = 8
1 011 10
512Mb (64M × 8), 4 banks, row length = 13, column length = 11
1 100 00
512Mb (32M × 16), 4 banks, row length = 13, column length = 10
1 100 01
DESCRIPTION
Version 1.0
LH79524/LH79525 User's Guide