PSB7238 SIEMENS [Siemens Semiconductor Group], PSB7238 Datasheet - Page 56

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

Semiconductor Group
The relevant parameters for controlling the transfer of the HDLC/transparent data
channels are:
LMOD(1:0)
HHR
HHX
The access right to the receiver and transmitter input/output from the DSP or the host
(determined by bits HHR1/2 and HHX1/2) is independent of who is allowed to service the
HDLC controller (determined by bits HAH1/2).
The maskable interrupt status bits for controlling the transfer are:
BFHR
BFHX
The block diagrams for the receive and transmit HDLC controller channels are shown in
the following Figures.
Figure 23
Load mode (access byte by byte without delay, or access in 1, 2 or 4 byte
units with a corresponding serial data delay).
Access to HDLC/transparent data receiver input from DSP (HHR = 0) or
from host (HHR = 1).
Access to HDLC/transparent data output shift register from DSP
(HHX = 0) or from host (HHX = 1).
Buffer full for HDLC receiver (new data can be read from HRR and written
into HRW).
Buffer full for HDLC transmitter (new data can be read from HXR and
written into HXW).
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Data Sheet 1998-07-01
Functional Blocks
PSB 7238