z89138 ZiLOG Semiconductor, z89138 Datasheet - Page 43

• Manufacturer Part Number: z89138
• Description: Voice Processing Controllers
• Manufacturer: ZiLOG Semiconductor

Zilog
DSP Z8 Mail Box
To receive information from the DSP, the Z8 uses eight in-
coming registers which are mapped in the Z8 extended
Register File (Bank B, 08 to 0F). The DSP treats these as
four 16-bit registers that correspond to the eight incoming
Z8 registers (Figure 31).
The Z8 can supply the DSP with data through eight outgo-
ing registers mapped into both the Z8 Expanded Register
File (Bank B, Registers 00 to 07) and the external register
interface of the DSP. These registers are Read/Write and
can be used as general-purpose registers of the Z8. The
Outgoing [0] (B)00
Outgoing [1] (B)01
Outgoing [2] (B)02
Outgoing [3] (B)03
Outgoing [4] (B)04
Outgoing [5] (B)05
Outgoing [6] (B)06
Outgoing [7] (B)07
DS97TAD0201
Field
(B)00, (B)01
(B)02, (B)03
(B)04, (B)05
(B)06, (B)07
(B)08, (B)09
(B)0A, (B)0B
(B)0C, (B)0D
(B)0E, (B)0F
Table 12. Z8 Outgoing Registers (Read-Only from DSP)
76543210
76543210
76543210
76543210
76543210
76543210
76543210
76543210
Position
D7, D1
(F)0C
Figure 31. Z8-DSP Interface
DSP Interrupt Control Register
P R E L I M I N A R Y
D/A and A/D Data Registers
Analog Control Register
Outgoing Registers
Incoming Registers
D9
Attrib
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
DSP can only read information from these registers. Since
the DSP uses a 16-bit data format and the Z8 an 8-bit data
format, eight outgoing registers of the Z8 correspond to
four DSP registers. The DSP can only read information
from the outgoing registers.
Both the outgoing registers and the incoming registers
share the same DSP address (EXT3-EXT0).
Note: The Z8 can read and write to ERF Bank B R00-R07,
Registers 08-0F are Read-Only from the Z8.
D2
Value
%NN
%NN
%NN
%NN
%NN
%NN
%NN
%NN
EXT0
EXT1
EXT2
EXT3
EXT4
EXT5
EXT6
EXT0
EXT1
EXT2
EXT3
Voice Processing Controllers
(B)00/DSP_ext0_hi
(B)01/DSP_ext0_lo
(B)02/DSP_ext1_hi
(B)03/DSP_ext1_lo
(B)04/DSP_ext2_hi
(B)05/DSP_ext2_lo
(B)06/DSP_ext3_hi
(B)07/DSP_ext3_lo
Z89138/Z89139
Label
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