PEB3265 Infineon Technologies Corporation, PEB3265 Datasheet - Page 137

• Manufacturer Part Number: PEB3265
• Description: (PEB326x / PEB426x) Dual Channel Slicofi-2 / Slic Duslic
• Manufacturer: Infineon Technologies Corporation

Preliminary
4.10
This chapter intends to describe the handling of the caller ID buffer and the
corresponding handshake bits in the interrupt registers.
Programming Sequence
In order to send a caller ID information over the telephone line the following sequence
should be programmed between the first and the second ring burst. The initialization part
of the coefficients in the POP registers 43h to 4Ah must be done prior to that sequence.
1. Enable the extended feature DSP in register XCR (EDSP-EN = 1)
2. Enable the caller ID sender feature in register BCR5 (CIS-EN = 1)
3. Wait for an interrupt.
4. Read out all 4 interrupt registers to serve the interrupt and check the CIS-REQ bit.
5. If this bit is set, send at least BRS + 2 bytes (see POP register CIS-BRS) of caller ID
6. Wait for the next interrupt and check again the CIS-REQ bit.
7. If this bit is set, send the next data to the caller ID-data buffer but not more than (48 –
8. Repeat steps 6 and 7 as long as there is data to be sent.
9. Right after sending the last data byte to the caller ID sender buffer, set the bit CIS-
The end of the CID transmission can also be controlled by not setting CIS-AUTO and
leaving CIS-EN at one. If the caller ID buffer gets empty, an interrupt is generated to
indicate buffer underflow (CIS-BUF). If CIS-BUF is set, set CIS-EN to zero with at least
1 ms delay, in order to allow to send the last bit of caller ID data.
In case of errors in the handling of the CID data buffer CIS-BUF (buffer underflow) and
CIS-BOF (buffer overflow) indicate these errors. Please stop CID transmission in any of
these cases since unpredictable results may occur.
Note: CID data will be sent out LSB first
If CIS-FRM is set to one: seizure and mark bits are generated automatically (according
to the settings of CIS-SEIZ-H/L and CIS-MARK-H/L) as well as start and stop bits for
every byte
Data Sheet
data but not more than 48 bytes to the caller ID sender buffer register CIS-DAT.
Caller ID sender buffer request size (BRS).
AUTO to 1 and the bit CIS-EN to 0. After processing the last bit the caller ID sender
will stop automatically and set the CIS-ACT bit in INTREG4 to zero. No more CIS
interrupt will be generated until the caller ID sender will be enabled again (interrupt
bits: CIS-BOF, CIS-BUF and CIS-REQ).
BRS) bytes. CIS-REQ bit gets reset to zero, if the data buffer is filled again above the
Caller ID Buffer Handling of SLICOFI-2
137
Operational Description
2000-07-14
DuSLIC