peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 30

• Manufacturer Part Number: peb20560
• Description: Dsp Oriented Pbx Controller Doc
• Manufacturer: Infineon Technologies Corporation

Semiconductor Group
Table 1-1 IOM
Pin
No.
9
8
7
6
Symbol
DD5/
TSCB1
DU5/
HFSB1
DD6/
DRQTB1
DU6/
CxDB1
®
In (I)
Out (O)
O(OD)
O
I
I
O(OD)
O
I
I
-2 Interface (cont’d)
During
Reset
High
Impedance
(from
ELIC1).
I
High
Impedance
(from
ELIC1)
I
Function
Data Downstream IOM-2 Interface 5/
Tri-State Control SACCO Channel B1, 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.
Data Upstream IOM-2 Interface 5/
HDLC-Interface Frame Synchronization
SACCO Channel B1
Frame synchronization pulse in clock mode 2,
data strobe in clock mode 1.
Data Downstream IOM-2 Interface 6/
DMA-Request Transmitter SACCO Channel B1
The transmitter of HDLC-Channel SACCO
requests a DMA-data transfer by activating this
line. The DRQT-pin remains “high” as long as
the transmit FIFO requires data transfers. The
number of data bytes to be transferred from
system memory to the FIFO must be written first
into the XBCH, XBCL registers (byte count
registers).
Data Upstream IOM-2 Interface 6/
Collision Data SACCO Channel B1
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 CxDB1 input
line has to be tied to
1-10
V
SS
.
PEB 20560
Overview
2003-08