Freescale Semiconductor Symphony DSP56724 Reference Manual page 346

External Memory Controller (EMC)
21.3.2.2.1 Address Mask
The address mask fields of the option registers (ORx[XAM,AM]) mask up to 13 corresponding
BRx[XBA,BA]. The 13 LSBs of the 24-bit internal address do not participate in bank address matching in
selecting a bank for access. Masking address bits independently allows external devices of different size
address ranges to be used. Address mask bits can be set or cleared in any order in the field, allowing a
resource to reside in more than one area of the address map.
8K words up to 16M words.
21.3.2.2.2 Option Registers (ORx)—GPCM Mode
Table 21-9 shows the bit fields for ORx when the corresponding BRx[MSEL] selects the GPCM machine.
ORHx
ORH0 X:$FF_FE03 R
ORH1 X:$FF_FE07
W
ORH2 X:$FF_FE0B
ORH3 X:$FF_FE0F
R
ORH4 X:$FF_FE13
W
ORH5 X:$FF_FE17
ORH6 X:$FF_FE1B
Reset
ORH7 X:$FF_FE1F
Symphony DSP56724/DSP56725 Multi-Core Audio Processors, Rev. 0
21-12
Table 21-8. Memory Bank Sizes in Relation to Address Mask
XAM Address Mask
11 0000_0000_000
11 1000_0000_000
11 1100_0000_000
11 1110_0000_000
11 1111_0000_000
11 1111_1000_000
11 1111_1100_000
11 1111_1110_000
11 1111_1111_000
11 1111_1111_100
11 1111_1111_110
11 1111_1111_111
Table 21-9. Option Register High Part—GPCM Mode(x)
23 22 21
11 10 9
Table 21-8
Memory Bank Size
in Words
16M
8M
4M
2M
1M
512K
256K
128K
64K
32K
16K
8K
20 19 18 17
8 7 6 5
0x00_0000
shows memory bank sizes from
16 15 14
4 3 2
AM
Freescale Semiconductor
13 12
1 0