psf2115 ETC-unknow, psf2115 Datasheet - Page 180

• Manufacturer Part Number: psf2115
• Description: Isdn Adapter Circuit Ipac
• Manufacturer: ETC-unknow

3.4.2
Interrupt Mode
Also 2
direction.
There are two different interrupt indications concerned with the reception of data:
• RPF (Receive Pool Full) interrupt, indicating that a 64 byte block of data can be read
• RME (Receive Message End) interrupt, indicating that the reception of one message
is stored in the RFIFOB.
After an interrupt has been processed, i.e. the received data has been read from the
RFIFOB, this must be explicitly acknowledged by the CPU issuing a RMC (Receive
Message Complete) command.
The CPU has to handle the RPF interrupt before additional 64 bytes are received via the
serial interface which would cause a ‘Receive Data Overflow’ condition.
In addition to the message end (RME) interrupt, the following information about the
received frame is stored by the IPAC in special registers and/or RFIFOB:
Table 26 Status Information after RME Interrupt
Length of message (bytes)
Address combination and/or
Address field
Control field
Type of frame (COMMAND/RESPONSE)
CRC result (good/bad)
Valid frame (yes/no)
ABORT sequence recognized (yes/no)
Data overflow
Semiconductor Group
from the RFIFOB and the received message is not yet complete.
is completed, i.e. either
– one message with less than 64 bytes, or the
– last part of a message with more than 64 bytes
64 byte FIFO buffers (receive pools) are provided for each channel in receive
Data Reception
180
RBCHB,
RBCLB
RSTAB
RAL1
RHCRB
RSTAB
RSTAB
RSTAB
RSTAB
RSTAB
Operational Description
Register
RFIFOB: last byte
RFIFOB
RFIFOB
RFIFOB: last byte
RFIFOB: last byte
RFIFOB: last byte
RFIFOB: last byte
RFIFOB: last byte
PSB 2115
PSF 2115
11.97