PSB7238 SIEMENS [Siemens Semiconductor Group], PSB7238 Datasheet - Page 70

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

Semiconductor Group
Parameters
SLIN = 0:
SLIN = 1:
CH(0:3)
CIL:
DLL:
4.4.1
Use of Monitor Channel
In the case where a local host is present, the Monitor channel may be used e.g. for data
exchange between the local host and another controller attached to the IOM-2 bus. For
this the basic monitor channel protocol as explained in this section is sufficient.
Note: The monitor channel protocol is not implemented on-chip on the PSB 7238. The
General Description of Monitor Channel Protocol
The monitor channel consists of 8 bits for the monitor data channel (MON) and 2 bits for
the flow control (MX and MR). The transmitter controls the monitor data channel and the
MX bit on one line while evaluating the condition of the MR bit on the other line. The
receiver evaluates the MX bit of one line and latches its monitor data value. It controls
the MR bit of the other line. The monitor channel protocol is shown in Figure 31.
The hardware performs reception and transmission of monitor channel messages
(packets) byte-by-byte under software control.
The received and transmitted monitor channel bytes are stored in the Monitor data
transmit (MONX) register and Monitor data Receive (MONR) register, respectively.
The software controls the monitor channel via two control bits in the monitor channel
control register:
MRE
MRC
MXC
monitor channel protocol has to be implemented via the host: this allows the
implementation of data exchange with a remotely located controller.
Monitor Channel Protocol
C/I channel transmit data on DU, receive data on DD
C/I channel transmit data on DD, receive data on DU
C/I channel in 4th byte of multiplex 0,
transmit channel (CH(0:3) = 0001 in the example)
C/I channel length is 4 bits (0) or 6 bits (1)
Double last look yes (1) or no (0)
Monitor channel Receiver Enable.
MR bit Control.
Monitor channel Transmitter Control.
70
, 15, common for receive and
Data Sheet 1998-07-01
Functional Blocks
PSB 7238