cx28560 Mindspeed Technologies, cx28560 Datasheet - Page 123

• Manufacturer Part Number: cx28560
• Description: Hdlc Controller
• Manufacturer: Mindspeed Technologies

CX28560 Data Sheet
5.7.11
5.7.11.1
Figure 5-2. Receive Time Slot Map Pointers
28560-DSH-001-B
Time Slot
Pointers
ENDADDR STADDR
RSIU Time Slot Configuration Register
Receive Time Slot Map
The Receive Time Slot Map comprises two 8192 entry memories containing slot to
group/channel mapping, and two 512 entry memories of pointers per port or per group.
One set of maps is provided per direction. Each port is assigned a start and end address
within the time slot/group map, and runs on the slots between these addresses. Each slot
may be either a direct mapping to a channel number and relevant parameters, or a
pointer to a group. If the slot contains a pointer to a group, this implies DS0 extraction is
to be performed. The relevant address within the group map pointers will be accessed to
retrieve start, length and current pointers, and the channel number and relevant
parameters will be retrieved from the Group Map (see
NOTE:
A channel may be mapped to more than one time slot within a port (hyper-
channeling), but mapping of one channel to more than one port is illegal and will
cause undefined ordering of data. Hence numerous mappings of time slots are
possible, multiple time slots can be mapped to a single channel or in the case of
TSBUS DS0 extraction mode mode, to a single group. For each serial port one time
slot map is required (per direction), and when in TSBUS DS0 extraction mode, group
maps should be provided per direction. Each map is configured independently. In the
receive direction the registers described in
Table 5-37
The group map and DS0 bit extraction are only to be used in ports that are
configured as TSBUS mode in the
mapped with the DS0 extraction bit set causes undefined behavior and so is
illegal.
DS0 # Chan # Group En M.E. 1st
...
0
0
1
0
0
0
are used for configuration of the time slot map.
Mindspeed Technologies™
...
TS/Group Map
a
b
c
d
e
...
x
Advance Information
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Group Map
Pointers
Table
Table
5-39; for other ports, a time slot
5-34,
STARTAD LENGTH
Figure
Table
The CX28560 Memory Organization
5-2).
5-35,
Table 5-36
# Chan En M.E. 1st
Group Map
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and
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101302_012
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5
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