PSB7238 SIEMENS [Siemens Semiconductor Group], PSB7238 Datasheet - Page 64

• Manufacturer Part Number: PSB7238
• Description: Joint Audio Decoder-Encoder - Multimode
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Semiconductor Group
RAC
RMC
RMD
RRES
In the case of a frame of length less than 64 bytes, the whole frame may be stored in the
receive FIFO. After the first 32 bytes have been received, the HDLC controller prompts
via RPF the controlling software to read data from the FIFO. When the data has been
read, the FIFO is released by issuing the RMC command, after which the rest of the
frame, when ready, is made available (see Figure 27).
Receiver Active
Sets the receiver in an active state, where the receiver hunts for an opening
flag.
In transparent mode, when RAC is set to ‘1’, storage of bytes in the receive
FIFO starts time-slot aligned (if the receive time-slot length is a multiple of
8 bits).
Receive Message Complete
Acknowledges a previous RPF or RME status. Frees the FIFO pool for the
next received frame or part of a frame.
Receive Message Delete
Reaction to an RPF interrupt. The remaining part of the current frame is to be
ignored by the receiver (which goes into the “hunt” mode, starting in the
DSP/host-inaccessible part of the RFIFO); the receive FIFO is cleared of that
frame.
Receiver Reset
Resets the HDLC receiver, which goes into an idle state (RAC cleared), clears
the receive FIFO and aborts any HDLC frame being received.
64
Data Sheet 1998-07-01
Functional Blocks
PSB 7238