Z89175 Zilog., Z89175 Datasheet - Page 46

• Manufacturer Part Number: Z89175
• Description: Voice Processing Controllers
• Manufacturer: Zilog.

DSP REGISTERS DESCRIPTION (Continued)
Z89175/Z89176
Voice Processing Controllers
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
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
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
46
Field
76543210
76543210
76543210
76543210
76543210
76543210
76543210
76543210
(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)
D7, D1
Position
(F)0C
Figure 31. Z8-DSP Interface
DSP Interrupt Control Register
D/A and A/D Data Registers
P R E L I M I N A R Y
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
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
(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
Label
DS97TAD0100
Zilog