Tdm busses in pass-through mode – Interphase Tech 4538 User Manual
Page 93
Chapter 3: Programming the Peripherals
4538 Hardware Reference Manual
71
TDM Busses in Pass-Through Mode
According to the TDM busses configuration (
VHH
), the
SIxAMR, SixBMR, SIxCMR, and SIxDMR registers must be set as follows (x=1 for line
1 to 2 and line 2 to 1, x=2 for line 3 to 4 and line 4 to 3):
SIxCMR and SIxDMR
• Reserved = 0: This bit should be cleared.
• SADx = 000: Starting bank address for the RAM of TDMs. 010 for second bank,
first 32 entries.
• SDMx = 01: SI Diagnostic Mode for TDMs. 01 means automatic echo. In this
mode, the TDM transmitter automatically retransmits the TDM
received data.
• RFSDx = 01: Receive frame sync delay for TDMs. 01 for 1 clock delay.
• DSCx = 0:
Double speed clock for TDMs. 0 means the channel clock rate is
equal to the data clock.
• CTRx = 1:
Common receive and transmit pin clocks for TDMs. 1 means Rx and
Tx clocks are common.
• SLx = 1:
Sync level for TDMs. 1 means sync active level is 0.
• CEx = 0:
Clock edge for TDMs. When DSCx = 0, data sent on the rising edge
and received on the falling edge.
• FEx = 0:
Frame Sync edge for TDMs. 0 for falling edge.
• GMx = 0:
Grant mode for TDMs. 0 for grant mode not used.
• TFSDx = 01: Transmit frame sync delay for TDMs. 01 for 1 clock delay.
Final Result of SIxCMR and SIxDMR registers is 0x0561.
SIxAMR (line 1 to 2 and line 3 to 4) or SIxBMR (line 2 to 1 and line 4 to 3):
• Reserved = 0: This bit should be cleared.
• SADx = 000: Starting bank address for the RAM of TDM. 000 for first bank, first
32 entries.
• SDMx = 00: SI Diagnostic Mode for TDM. 00 means normal operation.
• RFSDx = 01: Receive frame sync delay for TDM. 01 for 1 clock delay.
• DSCx = 0:
Double speed clock for TDM. 0 means the channel clock rate is
equal to the data clock.
• CTRx = 1:
Common receive and transmit pin clocks for TDM. 1 means Rx and
Tx clocks are common.
• SLx = 1:
Sync level for TDM. 1 means sync active level is 0.
• CEx = 0:
Clock edge for TDM. When DSCx = 0, data sent on the rising edge
and received on the falling edge.
• FEx = 1:
Frame Sync edge for TDMa. 1 for rising edge.
• GMx = 0:
Grant mode for TDM. 0 for grant mode not used.
• TFSDx = 01: Transmit frame sync delay for TDM. 01 for 1 clock delay.