peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 31

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

Table 1-1 IOM
Pin
No.
5
4
Note: DU 7…0 pins can be used only as inputs and not as I/O pins.
Semiconductor Group
DD 7…0 pins can be used only as outputs and not as I/O pins.
The SLD mode, of the ELICs, within the DOC, is not valid.
If DCL is programmed to be input, FSC will also be an input.
TEST0 and TEST1 pins must be connected to ‘0’ when not used.
Symbol
DD7/
DRQRB1
DU7/
DACKB1
®
In (I)
Out (O)
O(OD)
O
I
I
-2 Interface (cont’d)
During
Reset
High
Impedance
(from
ELIC1)
I
Function
Data Downstream IOM-2 Interface 7/
DMA-ReQuest Receiver Channel B1
The receiver of SACCO Channel requests a
DMA-data transfer by activating this line. The
DRQR-pin remains “high” as long as the
receiver FIFO requires data transfers. Only
blocks of 32, 16, 8 or 4 bytes are transferred.
Data Upstream IOM-2 Interface 7/
DMA-ACKnowledge SACCO Channel B1,
active low.
When “low”, this line notifies the SACCO
HDLC-channel, that the requested DMA-cycle is
in progress. Together with RD (DRQR) or
WR(DRQT) DACK works like CS to enable a
read or write operation to the top of the receive
or the transmit FIFO. When DACK is active, the
address lines are ignored and the FIFOs are
implicitly selected.
When DACKB1 is not used the input line must
be connected to
1-11
V
DD.
PEB 20560
Overview
2003-08