Motorola MSC8101 ADS User's Guide Page 210

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10-8 MSC8101 User’s Guide
Multi-Channel Controllers (MCCs)
Figure 10-6. T1/E1 Data Frame
10.2.1 Provide Appropriate Signal Polarity and Timing
Table 10-3 defines the SI Mode Register bit settings required on the MSC8101 to provide
appropriate signal polarity and timing to the PM6388 line transceiver.
10.2.2 Perform a Phased Test of the Transceiver Interface
During the development process, several loopback options can aid in a phased test of the
PHY interface.
SIRAM loopback. Allows verification of the MCC and serial interface
programming with loopback at the serial interface.
TDM loopback. Tests the time-slot assigner (TSA) programming with L1TXDB
connected internally to L1RXDB.
Table 10-3. MSC8101 SI Mode Register Settings
Register Setting Description
SIxMR[RFSDx] = 00
SIxMR[TFSDx] = 00
L1RSYNCB/L1TSYNC have no L1RCLK/L1TCLK delay from synchronization to data.
SIxMR[FEx] = 0 L1TSYNCB and L1RSYNCB pulses are sampled at the falling edge of TCLK/RCLK.
SIxMR[SLx] = 0 L1TSYNCB and L1RSYNCB are active high signals.
SIxMR[CEx] = 0
SIxMR[DSCx] = 0
Rx Data is latched in on the falling edge, Tx data on the rising edge of
L1TCLK/L1RCLK. The double-speed TDM clock is
not
used.
L1RSYNCB
32 Time Slots
slot 0
Data Frame 1
-------
MCC
Ch160
L1RCLKB
L1RSYNCB (RFSYNC)
L1RXDB
bit 6 bit 5bit 7 bit 3
bit 2
bit 4 bit 0bit 1
8 Bit Slot
L1TXDB
bit 6 bit 5bit 7 bit 3
bit 2
bit 4 bit 0bit 1
slot 1
MCC
Ch161
slot 2
MCC
Ch162
slot 3
MCC
Ch163
slot 4
MCC
Ch164
slot 5
MCC
Ch165
MCC
Ch---
MCC
Ch---
MCC
Ch---
MCC
Ch---
slot29
MCC
Ch189
slot30
MCC
Ch190
slot31
MCC
Ch191
------- ------- -------
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