cx28560 Mindspeed Technologies, cx28560 Datasheet - Page 124

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

The CX28560 Memory Organization
5.7.11.2
Table 5-34. RSIU TS/Group Map
5-34
31:18
16:14
13:3
Bit
17
2
1
0
RSVD
RDS0
RSVD
RCHANNEL[10:0]
RDS0_GROUP
RTS_ENABLE
RMASKEN_SB
RFIRST_TS
Field Name
RSIU Time Slot Configuration Descriptor
For each time slot in the Time Slot Map, there is an RSIU Time Slot Configuration
Descriptor. There are 8192 entries in memory that set the translation between time
slots and logical channels or groups for each of the CX28560's 32 ports. The actual
mapping of these time slot descriptors to the 32 ports is done by 32 sets of pointer
pairs (receive and transmit), one pair set for each port, which indicates the start and
the end address of the memory location that belongs to the configured port. Time Slot
pointer allocation is described in RSIU Time Slot Pointer Allocation. The bit fields of
RSIU Time Slot Configuration Descriptor include information:
Table 5-34
type of entry in the specific row of the TS/Group Map is determined by the DS0 bit.
• This time slot should be referred to a group map for a higher level of extraction
• Time slot is enabled or disabled
• Time slot is a full DS0, or sub-channeling enabled so that only a part of
• Indicates if it is the first time slot assigned to the logical channel
• Logical channel number (max 2047).
Value
—
—
0
0
1
0
0
1
0
1
0
1
64 Kbps transports information
specify the content of each receive time slot configuration descriptor. The
Reserved
DS0 extraction mode is disabled
DS0 mode is enabled.
This bit must only be set if the port to which this time slot is connected is configured
as TSBUS Mode see )
Reserved
If DS0 extraction mode is disabled for this time slot, this field represents the logical
channel number assigned to the time slot.
If DS0 extraction mode is enabled for this time slot, the lower 9 bits of this field
represent the logical group number assigned to the time slot.
Time Slot Disabled or DS0 extraction mode is enabled.
Time Slot Enabled.
This bit is only valid if DS0 extraction mode is disabled (RDS0 = 0)
The RMASK_SB bit field () is ignored. All the 8 bits of the time slot are processed.
This value is also possible if DS0 extraction mode is enabled.
Allow data mask for time slot. Only the bits specified by the RMASK_SB bit field () are
processed. This bit is only valid if DS0 extraction mode is disabled (RDS0 = 0)
This bit field indicates that the specified time slot is not the first time slot of the logical
channel or that DS0 extraction mode is enabled.
This bit field indicates that the specified time slot is the first time slot of the logical
channel. This bit is only valid if DS0 extraction mode is disabled (RDS0 = 0)
NOTE(S):
operate over the serial port must have one time slot assigned to that logical channel
as the first time slot for that channel.
Mindspeed Technologies™
If a serial port is configured to transparent mode, each channel defined to
Advance Information
Description
CX28560 Data Sheet
28560-DSH-001-B