T7264 Просмотр технического описания (PDF) - Agere -> LSI Corporation
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T7264 Datasheet PDF : 54 Pages
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Data Sheet
April 1998
T7264 U-Interface 2B1Q Transceiver
K2 Interface Description (continued)
K2 Bits Description
Table 4 summarizes the K2 interface bits which are
common to all configurations. The K2 frame consists of
eight octets of data. The first three octets contain the
18 bits of 2B+D data. Bits 5—8 of the third octet contain
U frame and superframe timing (DF). Octet 4 (S1) is
reserved for future use and should always be set to 1.
Octets 5, 6, and 7 are directly mapped to the U-inter-
face M (UM) maintenance bits which are transparent to
the device, except the adea bit. Octet 8 is for device
status (DS) and device control (DC). These bits must
be manipulated according to the T1.601 standard to
obtain proper system-level operation.
Figure 11 describes the four different K2 interface for-
mats for DO and DI at the NT and LT. Tables 5—14 de-
scribe the position and meaning of the various bits on
the K2 interface. Tables 15 and 16 show the active logic
level for these bits, their value during reset/idle, and
their value when the transceiver is operational.
Table 4. K2 Interface Serial Data Bit Map
Bits marked with 1 should always be set to a 1. Bits marked as Rxx are reserved by T1.601 and should be set
to a 1.
Symbol
B1
B2
D
DF
S1
UM1
UM2
UM3
DS
DC
Time ----------------------------------------------------------->
Octet Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6
1
B11 B12 B13 B14 B15 B16
2
B21 B22 B23 B24 B25 B26
3
D1
D2
1
1
1
1
3
D1
D2
1
1
RSF RF
4
1
1
1
1
1
1
5
a1
a2
a3
dm
i1
i2
6
i5
i6
i7
i8
act
R1, 5
7
R2, 5
*
*
*
*
R6, 4
8
nebe xact
†
1
oof
1
8
ccrc istp lpbk afrst ldea
1
Bit 7
B17
B27
1
TSF
1
i3
R1, 6
*
rsksi
sksi
Bit 8
B18
B28
1
TF
1
i4
*
*
1
xpcy
* Items differ dependent upon NT or LT mode.
† Don't care.
Lucent Technologies Inc.
13
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