
DS2156
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31.2 UTOPIA Backplane Mode
ATM traffic can be assigned on a fractional basis. See Section 24 for UTOPIA operation.
Register Name:
CCR3
Register Description:
Common Control Register 3
Register Address:
72h
Bit #
7
6
5
4
Name
TMSS INTDIS
CTTUI
CRRUI
Default
0
0
0
0
Bit 0/Receive Gapped-Clock Enable (RGPCKEN)
0 = RCHCLK functions normally
1 = enable gapped bit-clock output on RCHCLK
Bit 1/Receive Channel-Data Format (RDATFMT)
0 = 64kbps (data contained in all 8 bits)
1 = 56kbps (data contained in seven out of the 8 bits)
Bit 2/Transmit Gapped-Clock Enable (TGPCKEN)
0 = TCHCLK functions normally
1 = enable gapped bit-clock output on TCHCLK
Bit 3/Transmit Channel-Data Format (TDATFMT)
0 = 64kbps (data contained in all 8 bits)
1 = 56kbps (data contained in seven out of the 8 bits)
Bit 4/Connect RCLK to Receive UTOPIA Interface (CRRUI).
This bit selects either a constant clock (RCLK)
or a gapped clock from the framer (programmed by the user) as its data clock.
0 = gated clock is connected to receive UTOPIA interface
1 = RCLK is connected to receive UTOPIA interface
Bit 5/Connect TCLK to Transmit UTOPIA Interface (CTTUI).
This bit selects either a constant clock (TCLK)
or a gapped clock from the framer (programmed by the user) as its data clock.
0 = gated clock is connected to transmit UTOPIA interface
1 = TCLK is connected to transmit UTOPIA interface
Bit 6/Interrupt Disable (INTDIS).
This bit is convenient for disabling interrupts without altering the various
interrupt mask register settings.
0 = interrupts are enabled according to the various mask register settings
1 = interrupts are disabled regardless of the mask register settings
Bit 7/Transmit Multiframe Sync Source (TMSS).
Should be set = 0 only when transmit hardware signaling is
enabled.
0 = elastic store is source of multiframe sync
1 = framer or TSYNC pin is source of multiframe sync
3
2
1
0
TDATFMT
0
TGPCKEN
0
RDATFMT
0
RGPCKEN
0