Motorola ASTRO Digital Spectra - Figure 3-13. Vocoder Memory Mapping

6881076C25-E September 5, 2008
Theory of Operation: ASTRO Spectra VOCON Board 3-27
Figure 3-13. Vocoder Memory Mapping
The ADSIC internal registers are decoded internally and start at $E000 in Dy:. These registers are
decoded using A0-A2, A13-A15, and PS* from the DSP. The ADSIC internal registers are 16 bits
wide, so only D8-D23 are used.
$0000
$01FF
$0FFF
$0200
$1000
$1FFF
$E000
$DFFF
External
RAM
U403
$2000
$7FFF
$FFFF
External
RAM
U402
$8000
DyDxP
ADS Vectors
ADSIC
Registers
$9FFF
$A000
External ROM
16KB Physical
Banks
$00000-1FFFF
Internal P Ram
ADS P Ram
Not Used
External ROM
16KB Physical
Banks
$20000-3FFFF
Internal X Rom
Internal Y Rom
MAEPF-26007-A
Internal Dx Ram
ADS Dx Ram
Internal Dy Ram
ADS Dy Ram
External
RAM
U401