z89136 ZiLOG Semiconductor, z89136 Datasheet - Page 44

• Manufacturer Part Number: z89136
• Description: Low-cost Dtad Controller
• Manufacturer: ZiLOG Semiconductor

Z89135/136 (ROMless)
Low-Cost DTAD Controller
DSP-Z8 MAILBOX
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 30).
Both the outgoing registers and the incoming registers
share the same DSP address (EXT3-EXT0).
1-44
(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
D7, D1
(F)0C
Figure 30. Z8-DSP Interface
DSP Interrupt Control Register
D/A and A/D Data Registers
Analog Control Register
P R E L I M I N A R Y
Outgoing Registers
Incoming Registers
D9
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
four DSP registers. The DSP can only read information
from the outgoing registers.
Note: The Z8 can read and write to ERF Bank B R00-R07,
Registers 08-0F are Read Only from the Z8.
D2
EXT0
EXT1
EXT2
EXT3
EXT4
EXT5
EXT6
EXT0
EXT1
EXT2
EXT3
DS97TAD0300
Zilog