TDM Power Saving
MSC8113 Reference Manual, Rev. 0
Freescale Semiconductor
20-31
6.
Repeat steps 3–5 until you read the same value from the ASD field for 20 consecutive
times. At this time the ASD value is valid and can be used to configure the TDM
receiver or transmitter.
7.
Clear the AME bit in the TDMxACR to disable the adaptation machine.
8.
Configure the receiver or transmitter according to the following parameters:
— ASD value.
— Number of active links.
— Channel size.
— SYN
20.3
TDM Power Saving
The MSC8113 TDMs use the stop mode of different clocks to save power. Each TDM has three
clock domains: transmit serial, receive serial, and the system clock. The transmit serial clock is
not supplied to the TDM module when the transmitter is disabled, that is, the TDMxTCR[TEN]
bit and the TDMxTSR[TENS] are both clear. The receive serial clock is not supplied to the TDM
module when the receiver is disabled, TDMxRCR[REN] bit and TDMxRSR[RENS] bit are both
clear. The system clock automatically stops when the TDM is disabled, that is, both transmitter
and receiver are disabled. In addition, the TDM registers get the system clock only at reset or
during an IPBus access.
Each TDM has a status bit in the Stop Ack Status Register (SASR) (see page 19-7), which
indicates the TDM system clock activity status.
20.4
Channel Activation
The TACT and RACT bits in the Transmit/Receive Channel Parameter Registers (see page 20-58
and page 20-59) are enabled during the receiver/transmitter operation to control the channel
activation. If the TACT/RACT bit is clear, the channel is not active. Otherwise, it is active. The
procedure for activating an inactive receive channel (C) is as follows:
1.
Verify that the active (RACT) bit of the channel is clear.
2.
Write the initialization value to the channel locations in the receive TDM local memory.
The receive local memory contains 1, 2, 4, 8, 16, or 32 buffers so that each buffer contains
8 bytes per channel. The location of channel C in buffer B is the 8 bytes that start at
(256 / (RNB + 1)
×
B + C)
×
8. (See Section 20.2.3, TDM Data Structures, on
page 20-13). For example, if the number of buffers is four, the SC140 core should write
the initialization value to all four receive buffers. Initializing the receive TDM local
memory prevents invalid data from being received by the channel buffer in the main
memory.
3.
Set the TDMxRCPRC[RACT] bit (C indicates the channel number).
Summary of Contents for MSC8113
Page 1: ...MSC8113 Reference Manual Tri Core 16 Bit Digital Signal Processor MSC8113RM Rev 0 May 2008 ...
Page 20: ...MSC8113 Reference Manual Rev 0 xx Freescale Semiconductor Contents ...
Page 28: ...MSC8113 Reference Manual Rev 0 xxviii Freescale Semiconductor ...
Page 56: ...MSC8113 Reference Manual Rev 0 1 28 Freescale Semiconductor MSC8113 Overview ...
Page 76: ...MSC8113 Reference Manual Rev 0 2 20 Freescale Semiconductor SC140 Core Overview ...
Page 134: ...MSC8113 Reference Manual Rev 0 4 30 Freescale Semiconductor System Interface Unit SIU ...
Page 168: ...MSC8113 Reference Manual Rev 0 6 18 Freescale Semiconductor Boot Program ...
Page 180: ...MSC8113 Reference Manual Rev 0 7 12 Freescale Semiconductor Clocks ...
Page 260: ...MSC8113 Reference Manual Rev 0 8 80 Freescale Semiconductor Memory Map ...
Page 300: ...MSC8113 Reference Manual Rev 0 9 40 Freescale Semiconductor Extended Core ...
Page 304: ...MSC8113 Reference Manual Rev 0 10 4 Freescale Semiconductor MQBus and M2 Memory ...
Page 308: ...MSC8113 Reference Manual Rev 0 11 4 Freescale Semiconductor SQBus ...
Page 590: ...MSC8113 Reference Manual Rev 0 17 46 Freescale Semiconductor Interrupt Processing ...
Page 614: ...MSC8113 Reference Manual Rev 0 18 24 Freescale Semiconductor Debugging ...
Page 622: ...MSC8113 Reference Manual Rev 0 19 8 Freescale Semiconductor Internal Peripheral Bus IPBus ...
Page 724: ...MSC8113 Reference Manual Rev 0 21 32 Freescale Semiconductor UART ...
Page 920: ...MSC8113 Reference Manual Rev 0 25 150 Freescale Semiconductor Ethernet Controller ...
Page 1171: ...MSC8113 Reference Manual Rev 0 Freescale Semiconductor C 61 EF wait_rts P 01077FFC 9F rts 71 ...
Page 1172: ...MSC8113 Reference Manual Rev 0 C 62 Freescale Semiconductor MSC8113 Boot Code ...
Page 1202: ...MSC8113 Reference Manual Rev 0 Index 30 Freescale Semiconductor Index ...