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TUSB3200A Datasheet(PDF) 74 Page - Texas Instruments |
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TUSB3200A Datasheet(HTML) 74 Page - Texas Instruments |
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74 / 102 page  TUSB3200A SLES018B – OCTOBER 2001 – REVISED FEBRUARY 2011 www.ti.com A.5.2.2 DMA Channel 3 Time Slot Assignment Register (High Byte) (DMATSH3 − Address FFF8h) The DMA channel 3 time slot assignment register (high byte) contains the six most significant time slot bits. In addition, this register contains the bytes per time slot control bits. BIT 7 6 5 4 3 2 1 0 MNEMONIC BPTS1 BPTS0 TSL13 TSL12 TSL11 TSL10 TSL9 TSL8 TYPE R/W R/W R/W R/W R/W R/W R/W R/W DEFAULT 0 0 0 0 0 0 0 0 BIT MNEMONIC NAME DESCRIPTION 7:6 BPTS(1:0) Bytes per time slot The bytes per time slot bits are used to define the number of bytes to be transferred for each time slot supported by this DMA channel. 00b = 1 byte, 01b = 2 bytes, 10b = 3 bytes, 11b = 4 bytes 5:0 TSL(13:8) Time slot assignment The DMA time slot assignment bits are set to a 1 by the MCU to define the codec port interface time slots supported by this DMA channel. 5:0 TSL(13:8) Time slot assignment The DMA time slot assignment bits are set to a 1 by the MCU to define the codec port interface time slots supported by this DMA channel. A.5.2.3 DMA Channel 3 Control Register (DMACTL3 − Address FFF7h) The DMA channel 3 control register is used to store various control bits for DMA channel 3. BIT 7 6 5 4 3 2 1 0 MNEMONIC DMAEN WABEN — — EPDIR EPNUM2 EPNUM1 EPNUM0 TYPE R/W R/W R R R/W R/W R/W R/W DEFAULT 0 0 0 0 0 0 0 0 BIT MNEMONIC NAME DESCRIPTION 7 DMAEN DMA enable The DMA enable bit is set to a 1 by the MCU to enable this DMA channel. Before enabling the DMA channel, all other DMA channel configuration bits should be set to the desired value. 6 WABEN Wrap-around buffer enable The wrap-around buffer enable bit is used by the MCU to enable or disable the wrap-around buffer operation. The wrap-around buffer operation can only be used by isochronous out endpoints or isochronous in endpoints that are serviced by the DMA channels. The wrap-around buffer operation is enabled or disabled separately for each DMA channel. For a DMA channel, the MCU should set this bit to a 1 to enable the wrap-around buffer operation and clear this bit to a 0 to disable the wrap-around buffer operation. Both the DMA channel and UBM logic use this bit to determine the required functionality. 5 — Reserved Reserved for future use 4 — Reserved Reserved for future use 3 EPDIR USB endpoint direction The USB endpoint direction bit controls the direction of data transfer by this DMA channel. The MCU should set this bit to a 1 to configure this DMA channel to be used for a USB in endpoint. The MCU should clear this bit to a 0 to configure this DMA channel to be used for a USB out endpoint. 2:0 EPNUM(2:0) USB endpoint number The USB endpoint number bits are set by the MCU to define the USB endpoint number supported by this DMA channel. Keep in mind that endpoint 0 is always used for the control endpoint, which is serviced by the MCU and not a DMA channel. 001b = Endpoint 1, 010b = Endpoint 2, …, 111b = Endpoint 7 74 MCU Memory and Memory-Mapped Registers Copyright © 2001–2011, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TUSB3200A |
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