CN8478 Datasheet, PDF (105/221 Pages) Conexant Systems, Inc – Multichannel Synchronous Communications Controller (MUSYCC)

CN8478/CN8474A/CN8472A/CN8471A
Multichannel Synchronous Communications Controller (MUSYCC™)
5.0 Memory Organization
5.2 Descriptors
Table 5-12. Port Configuration Descriptor
Bit
Field
Name
Value
Description
31:10
9
RSVD
TRITX
8
ROOF_EDGE
7
RSYNC_EDGE
6
RDAT_EDGE
5
TSYNC_EDGE
4
TDAT_EDGE
3
RSVD
2:0
PORTMD[2:0]
0
Reserved.
0
Transmit Three-state Enabled. When a channel group is enabled, but a time slot within
the group is not mapped via the Time Slot Map, the transmitter three-states the output
data signal.
1
Transmit Three-State Disabled. When a channel group is enabled, but a time slot within
the group is not mapped via the Time Slot Map, the transmitter outputs a logic 1 on the
output data signal.
0
Receiver Out of Frame—Falling Edge. ROOF input sampled in on falling edge of RCLK.
1
Receiver Out of Frame—Rising Edge.
0
Receiver Frame Synchronization—Falling Edge. RSYNC input sampled in on falling
edge of RCLK.
1
Receiver Frame Synchronization—Rising Edge.
0
Receiver Data—Falling Edge. RDAT input sampled in on falling edge of RCLK.
1
Receiver Data—Rising Edge.
0
Transmitter Frame Synchronization—Falling Edge. TSYNC input sampled in on falling
edge of TCLK.
1
Transmitter Frame Synchronization—Rising Edge.
0
Transmitter Data—Falling Edge. TDAT output latched out on falling edge of TCLK.
1
Transmitter Data—Rising Edge.
0
Reserved.
0
T1 Mode—24 time slots and T1 signaling.
1
E1 Mode—32 time slots and E1 signaling.
2
2xE1 Mode—64 time slots and E1 signaling.
3
4xE1 Mode—128 time slots and E1 signaling.
4
Nx64 Mode. Frame synchronization flywheel disabled. COFA detection disabled. Every
synchronization signal assertion resets time slot counter to zero.
5–7 Reserved.
100660E
Conexant
5-19