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ADV202BBCZ-150 Datasheet(PDF) 27 Page - Analog Devices |
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ADV202BBCZ-150 Datasheet(HTML) 27 Page - Analog Devices |
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27 / 40 page  ADV202 Rev. 0 | Page 27 of 40 CONTROL ACCESS REGISTERS With the exception of the indirect address and data registers (IADDR and IDATA), all control/status registers in the ADV202 are 16 bits wide and are half-word (16-bit) addressable only. When 32-bit host mode is enabled, the upper 16 bits of the HDATA bus are ignored on writes and return all zeros on reads of 16-bit registers. PIN CONFIGURATION AND BUS SIZES/MODES The ADV202 provides a wide variety of control and data configurations, which allows it to be used in many applications with little or no glue logic. The following modes are configured using the BUSMODE register. In the following descriptions, host refers to normal addressed accesses (CS/RD/WR/ADDR) and data refers to external DMA accesses (DREQ/DACK). 32-Bit Host/32-Bit Data In this mode, the HDATA<31:0> pins provide full 32-bit wide data access to PIXEL, CODE, ATTR, and ANCL FIFOs. The expanded video interface (VDATA) is not available in this mode. 16-Bit Host/32-Bit Data This mode allows a 16-bit host to configure and communicate with the ADV202 while still allowing 32-bit accesses to the PIXEL, CODE, ATTR, and ANCL FIFOs using the external DMA capability. All addressed host accesses are 16 bits and, therefore, use only the HDATA<15:0> pins. The HDATA<31:16> pins provide the additional 16 bits necessary to support the 32-bit external DMA transfers to and from the FIFOs only. The expanded video interface (VDATA) is not available in this mode. 16-Bit Host/16-Bit Data This mode uses 16-bit transfers, if used for host or external DMA data transfers. This mode allows for the use of the extended pixel interface modes. 16-Bit Host/8-Bit Data (JDATA Bus Mode) This mode provides separate data input/output and host control interface pins. Host control accesses are 16 bits and use HDATA<15:0>, while the dedicated data bus uses JDATA<7:0>. JDATA uses a valid/hold synchronous transfer protocol. The direction of the JDATA bus is determined by the mode of the ADV202. If the ADV202 is encoding (compression), then JDATA<7:0> is an output. If the ADV202 is decoding (decompression), then JDATA<7:0> is an input. Host control accesses remain asynchronous. See also JDATA section below. STAGE REGISTER Because the ADV202 contains both 16-bit and 32-bit registers and its internal memory is mapped as 32-bit data, a mechanism has been provided to allow 16-bit hosts to access these registers and memory locations using the stage register (STAGE). STAGE is accessed as a 16-bit register using HDATA[15:0]. Prior to writing to the desired register, the stage register must be written with the upper (most significant) half-word. When the host subsequently writes the lower half-word to the desired control register, HDATA is combined with the previously staged value to create the required 32-bit value that is written. When a register is read, the upper (most significant) half-word is returned immediately on HDATA and the lower half-word can be retrieved by reading the stage register on a subsequent access. For details on using the stage register, see the ADV202 User’s Guide. Note: The stage register does not apply to the four data channels (PIXEL, CODE, ATTR, or ANCL). These channels are always accessed at the specified data width and do not require the use of the stage register. JDATA MODE JDATA mode is typically used only when the dedicated video interface (VDATA) is also enabled. This mode allows code stream data (compressed data compliant with JPEG2000) to be input or output on a single dedicated 8-bit bus (JDATA<7:0>). The bus is always an output during compression operations, and is an input during decompression. A 2-pin handshake is used to transfer data over this synchronous interface. VALID is used to indicate that the ADV202 is ready to provide or accept data and is always an output. HOLD is always an input and is asserted by the host if it cannot accept/provide data. For example, JDATA mode allows real-time applications, in which pixel data is input over the VDATA bus while the compressed data stream is output over the JDATA bus. EXTERNAL DMA ENGINE The external DMA interface is provided to enable high bandwidth data I/O between an external DMA controller and the ADV202 data FIFOs. Two independent DMA channels can each be assigned to any one of the four data stream FIFOs (PIXEL, CODE, ATTR, or ANCL). The controller supports asynchronous DMA using a Data-Request/Data-Acknowledge (DREQ/DACK) protocol in either single or burst access modes. Additional functionality is provided for single address compatibility (fly-by) and dedicated chip select (DCS) modes. SPI PORT The SPI port provides serial communication to and from the ADV202. The ADV202 is always the SPI master. |
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