PSB7238 SIEMENS [Siemens Semiconductor Group], PSB7238 Datasheet - Page 34

• Manufacturer Part Number: PSB7238
• Description: Joint Audio Decoder-Encoder - Multimode
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Semiconductor Group
3.3.2
The DSP/host communication area contains the registers to support hardware and
software interrupts and special purpose registers that support communication between
the embedded DSP and the host. In multiplexed mode, address and data are multiplexed
on pins AD(0-7). It is necessary e.g for indirect programming of the configuration and
control registers from the host and for a complete access to all host addresses.
3.3.2.1
The address mapping in multiplexed mode is given in Table 9.
Table 9
DSP
Address
3076
3074
3072
3070
H
H
H
H
DSP Write
(always
16 bit Wide)
Acknowledge
INT
Interrupt INT
Mask
Acknowledge
INTR
Interrupt
INTR Mask
DSP/Host Com Area with a Multiplexed Host Interface
Access to DSP/Host Com Area
Address Mapping of DSP/Host Com Area (Multiplexed Mode)
DSP Read
(always
16 Bit Wide)
Interrupt INT
Status
Interrupt
INTR Status
34
Host
Address
AD0-7
FF
FD
77
76
75
74h
73
71
70
6C
H
H
H
H
H
H
Interfaces and Memory Organization
H
H
H
- FE
- FC
H
H
Host Write
(always 8 bit
Wide)
reserved
reserved
Acknowledge
INT MSB
Acknowledge
INT LSB
Interrupt INT
Mask MSB
Interrupt INT
Mask LSB
Acknowledge
INTR
Interrupt
INTR Mask
MSB
Interrupt
INTR Mask
LSB
reserved
Data Sheet 1998-07-01
Host Read
(always 8 bit
Wide)
reserved
reserved
Interrupt INT
Status MSB
Interrupt INT
Status LSB
Interrupt
INTR Status
MSB
Interrupt
INTR Status
LSB
reserved
PSB 7238