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| 型號(hào)： | T8100 |
| 英文描述： | H.100/H.110 Interface and Time-Slot Interchanger |
| 中文描述： | H.100/H.110接口和時(shí)隙交換器 |
| 文件頁數(shù)： | 37/92頁 |
| 文件大小： | 1450K |
| 代理商： | T8100 |
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Lucent Technologies Inc.
35
Preliminary Data Sheet
August 1998
H.100/H.110 Interface and Time-Slot Interchanger
Ambassador T8100
2 Architecture and Functional Descrip-
tion
(continued)
2.3 H-Bus Section
(continued)
2.3.2 CAM Operation and Commands
(continued)
If the user determines that a stream/time slot is no
longer valid, then the validity bit may be cleared by pre-
senting the connection address to the CAM and by
using the BKCn, break connection, command. The
connection that the user intends to break, which con-
sists of the time slot, and the stream plus control bits,
but not the tag, is transferred to the holding registers
prior to issuing this command. This is a two-cycle com-
mand: during the first cycle, the connection address is
presented to the CAM to identify which physical loca-
tion holds that connection address, and then, in the
second cycle, the validity bit is cleared for the identified
physical location. If there is a miss, it flags a no-match
error through the underflow bit in SYSERR.
Note:
A complete connection break requires two
BKCn commands, one for each half of the con-
nection, as with the MKCn command.
The clear location command, CLLn, is a one-cycle
command. The LAR contains the physical address (i.e.,
the physical CAM location) to be cleared. When it is
presented to the CAM, the validity bit is cleared, return-
ing the location to an empty status (i.e., it becomes
available for new make connection commands). The
CLLn can also be regarded as the second cycle of a
break connection command. CLLn is valuable if several
outputs are driven from a common input (broadcast)
and the user wishes to break one of the output connec-
tions, but leave the others intact. When the physical
location in the CAM is identified, either by software
tracking or by use of the find entry command (later in
this section), then the CLLn can be issued.
If the user wishes to poll the CAM for its contents, then
the RDCn or read CAM command can be used to
query a particular location (0—255) in a specific block
using the LAR for the location address. The contents of
the CAM and tag location are transferred to the holding
registers, and then the time slot, stream plus control,
and tag are returned (in sequence) from three consec-
utive IDR reads. The actual RDCn operation is one-
cycle.
The converse of the RDCn is the FENn, or find entry
command. It can be thought of as the first cycle of a
BKCn command. Only time slot and stream plus con-
trol bits are necessary for identifying the location. The
tag is not needed. The value returned to the IDR is the
physical location of the entry in the CAM block, if it is
found. If the entry is not found, then the underflow error
bit in the SYSERR register will be set. FENn is a one-
cycle command.
RSCn is the reset CAM command, and this renders all
locations in one CAM block invalid. This can be consid-
ered a CLLn for all locations in the CAM. Two special
resets are the RCH command, which resets only the
holding registers, and the CI command, which resets
all three CAM blocks and the holding registers. All
resets are one-cycle.
2.3.3 H-Bus Access
There are 32 bidirectional pins available for accessing
the H-Bus. The direction of the pins is selected by the
CAM read and write bits. Data rates for the pins are
selected in accordance with the H.100/H.110 specifica-
tions. Unassigned time slots on the H-bus are 3-stated.
Details about rate selection are provided below. Two
bits of the 13-bit address are used to select the CAM
block as indicated in Figure 9. The remaining
11 bits plus a read/write bit form a comparand that is
stored in a CAM location.
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