peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 33
peb20560
Manufacturer Part Number
peb20560
Description
Dsp Oriented Pbx Controller Doc
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEB20560.pdf
(433 pages)
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Table 1-3 Communication and Signaling Interfaces
Pin
No.
SACCO-B0
31
30
29
28
Semiconductor Group
Symbol
RxDB0
TxDB0
TSCB0
CxDB0
In (I)
Out (O)
I
O (OD)
O
I
During
Reset
I
High
Impedance
“High”
I
1-13
Function
Receive Serial Data HDLC-Channel B0.
The serial data received on this line is
forwarded into the corresponding
HDLC-receive channel. Data is sampled
on the
– falling edge of HDC (CCR2:RDS = 0) or
– rising edge of HDC (CCR2:RDS = 1).
Transmit Serial Data HDLC-Channel B0.
Data output line of the corresponding
HDLC-transmit channel. Data is sampled
on the bit CCR1:ODS the pins have push
pull or open drain characteristic. When
transmission is disabled (TSCB = 1) or
when bit CCR2:TXDE is reset the pin is in
the state high impedance. (Open Drain
output.)
Tri-State Control HDLC-Channel B0,
active low. Supplies a control signal for an
external driver. When low, the
corresponding TxD-outputs are valid. The
detailed functionality is defined
programming the SACCO-registers
CCR2:SOC1,SOC0.
Collision Data HDLC-Channel B0
In a bus configuration, the external serial
bus must be connected to the respective
CxD pin for collision detection.
In point-to-point configurations the pin
provides a “clear to send” function. When
‘0’/‘1’ the transmit channel is
enabled/disabled.
If this function is not needed the pin has to
be tied to
V
SS
.
PEB 20560
Overview
2003-08
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