T9000
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
10 GCI+ Interface Module (continued)
10.7 GCI+ Register Set (continued)
Table 81. GCOF1: GCI PFS1 Offset Select (0x2F)
Reg
R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
OFF13
0
Bit 2
OFF12
0
Bit 1
OFF11
0
Bit 0
OFF10
0
GCOF1
R/W
GTMODE G_R_LBK G_L_LBK OFF14
RESET Default
0
0
0
0
Bit #
Symbol
Name/Description
GCI Time-Out Mode. (Only Applicable on GCI-NT and GCI-TE Operation Modes.)
Enables the GCI time-out mechanism.
7
GTMODE
0: Time-out mechanism disabled.
1: Time-out mechanism enabled (abort after three TNR or RNRs), (0.5 ms since the
beginning of transmission).
6
5
G_R_LBK
G_L_LBK
OFF1[4:0]
GCI Remote Loopback.
0: Normal operation.
1: Upstream B1- and B2-channel data on the GCI is internally looped back to the
downstream GCI. Loopback is transparent, except when G_L_LBK is asserted at
the same time.
GCI Local Loopback.
0: Normal operation.
1: Downstream B1- and B2-channel data on the GCI is internally looped back to the
upstream GCI. Loopback is transparent, except when G_R_LBK is asserted at the
same time.
Offset of PS1. Determines the number of channel slots by which PFS1 (B1 channel) is
offset from the first time slot of the frame.
4—0
Table 82. GCOF2: GCI PFS2 Offset Select (0x30)
Reg
R/W
Bit 7
Bit 6
Bit 5
—
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
GCOF2
R/W
U_FORCE_B2DN U_FORCE_B1DN
OFF24 OFF23 OFF22 OFF21 OFF20
RESET Default
0
0
0
0
0
0
0
0
Bit #
Symbol
Name/Description
7
U_FORCE_B2DN Microcontroller Access to Downstream B2 Channel. When this bit is set, the
microcontroller can access the downstream B2-channel data from the U-interface to
the GCI via the register B2DN (0x54) assuming that DFR[B2_SEL] = 1 and
ECR0[LB2] = 0.
6
U_FORCE_B1DN Microcontroller Access to Downstream B1 Channel. When this bit is set, the
microcontroller can access the downstream B1-channel data from the U-interface to
the GCI via the register B1DN (0x53) assuming that DFR[B1_SEL] = 1 and
ECR0[LB1] = 0.
5
—
Reserved. Program to 0.
4—0
OFF2[4:0]
OFFSET of PFS2. Determines the number of time slots by which PFS2 (B2-channel)
is offset from the first time slot of the frame.
80
Lucent Technologies Inc.
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