peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 84

• Manufacturer Part Number: peb20560
• Description: Dsp Oriented Pbx Controller Doc
• Manufacturer: Infineon Technologies Corporation

Semiconductor Group
When a D-channel is enabled in the DCE-register and available, the control channel
master takes priority over the C/I- (MR) values stored in the EPIC-1 control memory and
writes out either MR = 1 or C/I = x0xx. When a D-channel is enabled but blocked, the
control channel master simply passes the C/I- (MR) values which are stored in the
EPIC-1 control memory. These values should have been programmed as MR = 0 or
C/I = x1xxx.
When a D-channel is disabled in the DCE-register the control channel master simply
passes the C/I- (MR) values which are stored in the EPIC-1 control memory. This gives
the user the possibility to exclude a D-channel from the arbitration but still decide
whether the excluded channel is available or blocked.
Overview of different conditions for control channel handling/information sent to
subscribers:
Table 2-11
Clock Mode
ASM State
CCHM
Subscriber in
DCEs
Information
sent to
Subscribers =
“available” or
“blocked”
2.1.2.5.2
In downstream direction no channel arbitration is necessary because the sequentiality of
the transmitted frames is guaranteed.
In order to define IOM-channel and port number to be used for a transmission, the
transmit channel selector (TCHS) provides a transmit address register (XDC) which the
user has to write before a transmit command (XTF) is executed. Depending on the
programming of the XDC-register the frame is transmitted in the specified D-channel or
send as broadcast message to the broadcast group defined in the registers BCG1-4.
Due to the continuous frame transmission feature of the SACCO, the full 16-kbit/s
bandwidth of the D-channel can be utilized, even when addressing different subscribers.
Note: The broadcast group must not be changed during the transmission of a frame
Downstream Direction
Enabled
According
to the
D-channel
Arbiter
State
(CCM)
Not suspended
‘1’ = enabled
3
Disabled
Content of
the
EPIC-1
Control
Memory-
(C/I or
MR)
Enabled
Content of
the
EPIC-1
Control
Memory-
(C/I or
MR)
2-38
‘1’ = enabled
Suspended
X
Disabled
Content of
the
EPIC-1
Control
Memory-
(C/I or
MR)
Functional Block Description
Enabled
Available!
‘0’ = disabled
PEB 20560
X
X
Disabled
Content
of the
EPIC-1
Control
Memory-
(C/I or
MR)
2003-08