MSC8113 Reference Manual, Rev. 0
20-16
Freescale Semiconductor
TDM Interface
20.2.4.2 Sync In Configuration
TDMxRSYN
is an input that identifies the beginning of the received frame.
TDMxTSYN
can be an
input or output from the TDM, but the transmitter refers to the transmit sync as an input because
the connection between the
sync_out
signal and the transmit sync (
tsync
) occurs only in the TDM
I/O matrix. Figure 20-19 illustrates the relation between the data, the sync, and the clock for
various configurations. The receive data and frame sync are sampled with the rising or falling
edge of the receive clock. The transmit frame sync is sampled with the rising or falling edge of
the transmit clock. The transmit data drives out at the rising or falling edge of the transmit clock.
The delay between the first data bit of the frame and the sync is referred to as the rising edge of
the sync. Table 20-5 lists the frame sync controls.
The receive delay when the receive sync and the receive data are not sampled at the same clock
edge is RFSD + 0.5. The transmit data can be driven out before the transmit sync sample.
Therefore, the transmit delay when the transmit sync and transmit data are sampled/driven out at
the same clock edge is (TFSD – 1). And when the sync and the data sampled/driven out at
different clock edge is (TFSD – 1 + 0.5).
Table 20-5. Transmit and Receive Frame Configuration
Control
Register
Which receive clock edge samples the receive frame sync. If RFSE is clear, the
receive frame sync is sampled on the rising edge of the receive clock.
TDMxRIR[RFSE] bit
Which transmit clock edge samples the transmit frame sync. If TFSE is clear,
the transmit frame sync is sampled on the rising edge of the transmit clock.
TDMxTIR[TFSE] bit, page 20-45
Which receive clock samples the receive data. If RDE is clear, the receive data
sync is sampled on the rising edge of the receive clock.
TDMxRIR[RDE] bit, page 20-43
Which transmit clock edge drives out the data. If TDE is clear, then the transmit
data is driven out on the rising edge of the transmit clock.
TDMxTIR[TDE] bit, page 20-45
Determines the receive sync level. If RSL is clear the receive sync level is high.
TDMxRIR[RSL] bit, page 20-43
Determines the transmit sync level. If TSL is clear the transmit sync level is
high.
TDMxTIR[TSL] bit, page 20-45
Determines the timing of the receive frame sync signal relative to the first data
bit of the receive frame.
TDMxRIR[RFSD] field, page 20-43
Determines the timing of the transmit frame sync signal relative to the first data
bit of the transmit frame.
TDMxTIR[TFSD] field, page 20-45
Содержание MSC8113
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