T9000
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
10 GCI+ Interface Module (continued)
10.7 GCI+ Register Set
Table 80. GCCF: GCI+ Configuration Register (0x2E)
Reg
R/W
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
GCCF
R/W
GDRIVER PFSDEL
PFSPE CKMODE GRATE1 GRATE0 GMODE1 GMODE0
RESET Default
0
0
0
0
0
0
0
0
Bit #
Symbol
Name/Description
7
GDRIVER
GCI+ Driver Type. Sets the type of output driver to be used for the GCI+ signal DD.
0: Open-drain driver.
1: Push-pull driver.
6
PFSDEL
PFS Delay. Sets the relative delay between PFSx (x = 1 or x = 2) and the first data bit of
the time slot associated with PFSx.
0: PFSx rising edge is coincident with the start of the corresponding time slot.
1: PFSx rising edge occurs one bit time before the start of the corresponding time
slot.
5
4
PFSPE
PFS Pulse (Short Frame Sync) or Envelope (Long Frame Sync) Mode. Sets the
duration of the PFSx (x = 1 or x = 2) pulse.
0: PFS is an 8-bit envelope lasting from one time slot minus one-half of a DCL period.
1: PFS lasts for one data bit time.
CKMODE
GCI+ Data Clock Mode. Sets the clock mode of the GCI+ DCL clock to single or double
clock mode when in TDM mode. This bit is ignored in GCI mode.
0: DCL set to double clock mode (two clocks per data bit).
1: DCL set to single clock mode (one clock per data bit).
3—2
GRATE[1:0] GCI+ Clock Rate. Sets the DCL clock rate when in TDM mode. In GCI mode
(GMODE[1:0] = 0x), these bits are ignored, unless they are equal to 00.
00: Clock disabled.
01: 512 kHz.
10: 1.536 MHz.
11: 2.048 MHz.
1—0 GMODE[1:0] GCI+ Operation Mode. Sets the mode of operation of the GCI+ Interface. When in either
of the GCI modes (GMODE[1:0] = 0x), these bits override the GRATE[1:0] values, unless
GRATE[1:0] = 00.
00: GCI-NT mode.
01: GCI-TE mode.
1x: TDM mode.
Lucent Technologies Inc.
79
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