pef82902 Infineon Technologies Corporation, pef82902 Datasheet - Page 35

• Manufacturer Part Number: pef82902
• Description: 4b3t Second Generation Modular Isdn Nt Intelligent Extended
• Manufacturer: Infineon Technologies Corporation

the address range 00
reception of the wradr. The sequence can have any length and is terminated by the rising
edge of CS.
Example for a read/write access with header 41
Header 49
This sequence (header 49
A-D-A-D read access. This mode is useful for reading status information before writing
to the HDLC XFIFO. Generally, it can be used for any register access to the address
range 00
wradr. The sequence can have any length and is terminated by the rising edge of CS.
Example for a read/write access with header 49
2.1.2
The 8-bit parallel microcontroller interface with address decoding on chip allows an easy
and fast microcontroller access.
The parallel interface of the T-SMINT
selected via pin ALE. The bus operation modes with corresponding control pins are listed
in
•
Table 6
The occurrence of an edge on ALE, either positive or negative, at any time during the
operation immediately selects the interface type (3). A return to one of the other interface
types is possible only if a hardware reset is issued.
Note: For a selected interface mode which does not require all pins (e.g. address pins)
Data Sheet
(1) Motorola
(2) Siemens/Intel non-multiplexed
(3) Siemens/Intel multiplexed
SDR
SDR
SDX
SDX
Table
Bus Mode
the unused pins must be tied to V
header
header
6.
H
-7D
H
Parallel Microcontroller Interface
: Interleaved A-D-D-D Sequence
H
Bus Operation Modes
. The termination condition of the read access is the reception of the
rdadr
rdadr
H
-7D
rddata
rddata
rdadr
H
) allows in front of the A-D-D-D write access an interleaved
H
. The termination condition of the read access is the
rddata
wradr
rdadr
â
IX provides three types of P busses which are
DD
wrdata
rddata
.
21
V
V
Edge
(wradr)
Pin ALE
DD
SS
H
H
:
:
wrdata
wradr
(wradr)
Control Pins
CS, R/W, DS
CS, WR, RD
CS, WR, RD, ALE
wrdata
wrdata
(wradr)
(wradr)
Functional Description
wrdata
(wradr)
PEF 81902
wrdata
(wradr)
2001-11-12