Z89175 Datasheet, PDF (46/68 Pages) Zilog, Inc. – Voice Processing Controllers

Z89175/Z89176
Voice Processing Controllers
DSP REGISTERS DESCRIPTION (Continued)
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
Zilog
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.
(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
(F)0C
D7, D1
Outgoing Registers
Incoming Registers
DSP Interrupt Control Register
EXT0
EXT1
EXT2
EXT3
EXT0
EXT1
EXT2
EXT3
EXT4
D/A and A/D Data Registers
EXT5
D9
Analog Control Register
D2
EXT6
Field
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
Figure 31. Z8-DSP Interface
Table 12. Z8 Outgoing Registers (Read-Only from DSP)
Position
76543210
76543210
76543210
76543210
76543210
76543210
76543210
76543210
Attrib
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Value
%NN
%NN
%NN
%NN
%NN
%NN
%NN
%NN
Label
(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
46
PRELIMINARY
DS97TAD0100