ADV202-SD-EB Analog Devices Inc, ADV202-SD-EB Datasheet - Page 27

• Manufacturer Part Number: ADV202-SD-EB
• Manufacturer: Analog Devices Inc

Specifications of ADV202-SD-EB

• Lead Free Status / Rohs Status: Not Compliant

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
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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.
ADV202