PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 40

• Manufacturer Part Number: PEF2091
• Description: ICs for Communications(ISDN Echocancellation Circuit)
• Manufacturer: Siemens Semiconductor Group

Semiconductor Group
2.2.2
(i.e. PMODE="1")
Pin No.
P-LCC-44
2.2.2.1
12
28
2.2.2.2
24
36
Pin Definition in Microprocessor Mode
Mode Selection Pins
Data, Address and µP Selection Pins
Pin No.
T-QFP64
M-QFP64
24
47
43
59
Symbol
PMODE
RES
SMODE
A0
SMODE
CDIN
A1
not used
Input (I)
Output (O)
I
I
I
I
40
Function
Processor Interface Enable: PMODE
must be set to "1" to enable the
Processor Interface (Multiplexed,
demultiplexed and serial modes).
Tie to GND or do not connect to select
stand-alone mode, see "Pin Definition
in Stand-Alone Mode", page 33.
Internal pull down.
Reset: Low active, must be (0) at least
for 30 ns, (see Table 4, page 53 for
complete description of available mode
configurations with this pin. The reset
in the LT and NT-PBX mode will be
carried out only after the IOM
clocks have been applied to the IEC-Q.
Tie to VDD if not used.
Serial mode pin: SMODE = 1 selects
serial mode, SMODE = 0 enables the
multiplexed mode.
Address bus pin (Demultiplexed
mode).
(Multiplexed mode) tie to GND
Controller Data In (Serial mode): CCLK
determines the data rate.
Address bus pin (Demultiplexed
mode).
(Multiplexed mode) tie to GND.
Pin Descriptions
Data Sheet 01.99
PEB 2091
PEF 2091
®
-2